| Millennium International Management LP | 
                    0.00% | 
                    29 Feb 2024 | 
                
        
                
                    | Millennium International Management LP | 
                    0.52% | 
                    27 Feb 2024 | 
                
        
                
                    | Citadel Advisors LLC | 
                    0.47% | 
                    3 Apr 2023 | 
                
        
                
                    | Citadel Advisors LLC | 
                    0.50% | 
                    13 Mar 2023 | 
                
        
                
                    | Citadel Advisors LLC | 
                    0.49% | 
                    27 Feb 2023 | 
                
        
                
                    | Citadel Advisors LLC | 
                    0.57% | 
                    17 Feb 2023 | 
                
        
                
                    | Marshall Wace LLP | 
                    0.42% | 
                    21 Mar 2019 | 
                
        
                
                    | Marshall Wace LLP | 
                    0.58% | 
                    19 Mar 2019 | 
                
        
                
                    | Marshall Wace LLP | 
                    0.67% | 
                    15 Mar 2019 | 
                
        
                
                    | Marshall Wace LLP | 
                    0.78% | 
                    6 Mar 2019 | 
                
        
                
                    | Marshall Wace LLP | 
                    0.88% | 
                    27 Feb 2019 | 
                
        
                
                    | Marshall Wace LLP | 
                    0.99% | 
                    18 Feb 2019 | 
                
        
                
                    | Marshall Wace LLP | 
                    1.09% | 
                    31 Jan 2019 | 
                
        
                
                    | Marshall Wace LLP | 
                    1.19% | 
                    2 Jan 2019 | 
                
        
                
                    | Marshall Wace LLP | 
                    1.24% | 
                    14 Dec 2018 | 
                
        
                
                    | Marshall Wace LLP | 
                    1.19% | 
                    5 Dec 2018 | 
                
        
                
                    | Marshall Wace LLP | 
                    1.20% | 
                    27 Nov 2018 | 
                
        
                
                    | Marshall Wace LLP | 
                    1.10% | 
                    9 Nov 2018 | 
                
        
                
                    | Marshall Wace LLP | 
                    1.01% | 
                    1 Nov 2018 | 
                
        
                
                    | QUARTYS LIMITED | 
                    0.00% | 
                    31 Oct 2018 | 
                
        
                
                    | Marshall Wace LLP | 
                    0.90% | 
                    25 Oct 2018 | 
                
        
                
                    | Marshall Wace LLP | 
                    0.85% | 
                    23 Oct 2018 | 
                
        
                
                    | Marshall Wace LLP | 
                    0.78% | 
                    22 Oct 2018 | 
                
        
                
                    | QUARTYS LIMITED | 
                    0.50% | 
                    22 Oct 2018 | 
                
        
                
                    | Marshall Wace LLP | 
                    1.21% | 
                    19 Oct 2018 | 
                
        
                
                    | Marshall Wace LLP | 
                    1.15% | 
                    16 Oct 2018 | 
                
        
                
                    | QUARTYS LIMITED | 
                    0.82% | 
                    15 Oct 2018 | 
                
        
                
                    | QUARTYS LIMITED | 
                    0.79% | 
                    12 Oct 2018 | 
                
        
                
                    | Marshall Wace LLP | 
                    1.02% | 
                    11 Oct 2018 | 
                
        
                
                    | QUARTYS LIMITED | 
                    0.53% | 
                    11 Oct 2018 | 
                
        
                
                    | Marshall Wace LLP | 
                    0.97% | 
                    10 Oct 2018 | 
                
        
                
                    | Marshall Wace LLP | 
                    0.82% | 
                    28 Sep 2018 | 
                
        
                
                    | Marshall Wace LLP | 
                    0.73% | 
                    18 Sep 2018 | 
                
        
                
                    | Marshall Wace LLP | 
                    0.68% | 
                    13 Sep 2018 | 
                
        
                
                    | Marshall Wace LLP | 
                    0.77% | 
                    7 Sep 2018 | 
                
        
                
                    | GSA Capital Partners LLP | 
                    0.49% | 
                    28 Aug 2018 | 
                
        
                
                    | Marshall Wace LLP | 
                    0.59% | 
                    24 Aug 2018 | 
                
        
                
                    | GSA Capital Partners LLP | 
                    0.53% | 
                    15 Aug 2018 | 
                
        
                
                    | Marshall Wace LLP | 
                    0.63% | 
                    15 Aug 2018 | 
                
        
                
                    | Marshall Wace LLP | 
                    0.51% | 
                    7 Aug 2018 | 
                
        
                
                    | Marshall Wace LLP | 
                    0.29% | 
                    27 Jun 2018 | 
                
        
                
                    | Marshall Wace LLP | 
                    0.51% | 
                    18 Jun 2018 | 
                
        
                
                    | GSA Capital Partners LLP | 
                    0.47% | 
                    13 Jun 2018 | 
                
        
                
                    | GSA Capital Partners LLP | 
                    0.58% | 
                    1 Jun 2018 | 
                
        
                
                    | GSA Capital Partners LLP | 
                    0.60% | 
                    2 May 2018 | 
                
        
                
                    | GSA Capital Partners LLP | 
                    0.58% | 
                    26 Apr 2018 | 
                
        
                
                    | GSA Capital Partners LLP | 
                    0.60% | 
                    24 Apr 2018 | 
                
        
                
                    | GSA Capital Partners LLP | 
                    0.50% | 
                    28 Mar 2018 | 
                
        
                
                    | GSA Capital Partners LLP | 
                    0.49% | 
                    19 Mar 2018 | 
                
        
                
                    | GSA Capital Partners LLP | 
                    0.59% | 
                    8 Mar 2018 | 
                
        
                
                    | Ninety One UK Ltd | 
                    0.42% | 
                    18 Jan 2018 | 
                
        
                
                    | BlackRock Investment Management (UK) Limited | 
                    0.48% | 
                    9 Jan 2018 | 
                
        
                
                    | BlackRock Investment Management (UK) Limited | 
                    0.59% | 
                    2 Jan 2018 | 
                
        
                
                    | GSA Capital Partners LLP | 
                    0.69% | 
                    2 Jan 2018 | 
                
        
                
                    | GSA Capital Partners LLP | 
                    0.70% | 
                    12 Dec 2017 | 
                
        
                
                    | BlackRock Investment Management (UK) Limited | 
                    0.65% | 
                    8 Nov 2017 | 
                
        
                
                    | GSA Capital Partners LLP | 
                    0.69% | 
                    3 Nov 2017 | 
                
        
                
                    | BlackRock Investment Management (UK) Limited | 
                    0.72% | 
                    13 Oct 2017 | 
                
        
                
                    | BlackRock Investment Management (UK) Limited | 
                    0.61% | 
                    11 Oct 2017 | 
                
        
                
                    | BlackRock Investment Management (UK) Limited | 
                    0.50% | 
                    5 Oct 2017 | 
                
        
                
                    | Ninety One UK Ltd | 
                    0.53% | 
                    26 Sep 2017 | 
                
        
                
                    | GSA Capital Partners LLP | 
                    0.76% | 
                    8 Sep 2017 | 
                
        
                
                    | GSA Capital Partners LLP | 
                    0.80% | 
                    6 Jul 2017 | 
                
        
                
                    | GSA Capital Partners LLP | 
                    0.70% | 
                    5 Jun 2017 | 
                
        
                
                    | GSA Capital Partners LLP | 
                    0.60% | 
                    24 Apr 2017 | 
                
        
                
                    | GSA Capital Partners LLP | 
                    0.50% | 
                    19 Apr 2017 | 
                
        
                
                    | GLG Partners LP | 
                    0.45% | 
                    30 Mar 2017 | 
                
        
                
                    | GLG Partners LP | 
                    0.58% | 
                    28 Mar 2017 | 
                
        
                
                    | GLG Partners LP | 
                    0.68% | 
                    24 Mar 2017 | 
                
        
                
                    | GLG Partners LP | 
                    0.77% | 
                    23 Mar 2017 | 
                
        
                
                    | GLG Partners LP | 
                    0.83% | 
                    22 Mar 2017 | 
                
        
                
                    | Marshall Wace LLP | 
                    0.46% | 
                    22 Mar 2017 | 
                
        
                
                    | GLG Partners LP | 
                    0.96% | 
                    21 Mar 2017 | 
                
        
                
                    | GLG Partners LP | 
                    1.08% | 
                    17 Mar 2017 | 
                
        
                
                    | GLG Partners LP | 
                    1.29% | 
                    15 Mar 2017 | 
                
        
                
                    | Marshall Wace LLP | 
                    0.58% | 
                    1 Mar 2017 | 
                
        
                
                    | GLG Partners LP | 
                    1.39% | 
                    22 Feb 2017 | 
                
        
                
                    | GLG Partners LP | 
                    1.41% | 
                    21 Feb 2017 | 
                
        
                
                    | Marshall Wace LLP | 
                    0.61% | 
                    15 Feb 2017 | 
                
        
                
                    | Marshall Wace LLP | 
                    0.58% | 
                    8 Feb 2017 | 
                
        
                
                    | Marshall Wace LLP | 
                    0.61% | 
                    3 Feb 2017 | 
                
        
                
                    | Marshall Wace LLP | 
                    0.51% | 
                    30 Jan 2017 | 
                
        
                
                    | CapeView Capital LLP | 
                    0.47% | 
                    14 Dec 2016 | 
                
        
                
                    | CapeView Capital LLP | 
                    0.54% | 
                    12 Dec 2016 | 
                
        
                
                    | GLG Partners LP | 
                    1.54% | 
                    8 Dec 2016 | 
                
        
                
                    | CapeView Capital LLP | 
                    0.63% | 
                    7 Dec 2016 | 
                
        
                
                    | GLG Partners LP | 
                    1.63% | 
                    7 Dec 2016 | 
                
        
                
                    | GLG Partners LP | 
                    1.89% | 
                    6 Dec 2016 | 
                
        
                
                    | GLG Partners LP | 
                    2.04% | 
                    5 Dec 2016 | 
                
        
                
                    | GLG Partners LP | 
                    2.14% | 
                    2 Dec 2016 | 
                
        
                
                    | GLG Partners LP | 
                    2.38% | 
                    29 Nov 2016 | 
                
        
                
                    | CapeView Capital LLP | 
                    0.77% | 
                    25 Nov 2016 | 
                
        
                
                    | CapeView Capital LLP | 
                    0.85% | 
                    21 Nov 2016 | 
                
        
                
                    | CapeView Capital LLP | 
                    0.65% | 
                    18 Nov 2016 | 
                
        
                
                    | GLG Partners LP | 
                    2.46% | 
                    17 Nov 2016 | 
                
        
                
                    | GLG Partners LP | 
                    2.39% | 
                    10 Nov 2016 | 
                
        
                
                    | CapeView Capital LLP | 
                    0.77% | 
                    9 Nov 2016 | 
                
        
                
                    | GLG Partners LP | 
                    2.40% | 
                    9 Nov 2016 | 
                
        
                
                    | GLG Partners LP | 
                    2.58% | 
                    8 Nov 2016 | 
                
        
                
                    | GLG Partners LP | 
                    2.64% | 
                    7 Nov 2016 | 
                
        
                
                    | GLG Partners LP | 
                    2.76% | 
                    3 Nov 2016 | 
                
        
                
                    | CapeView Capital LLP | 
                    0.89% | 
                    27 Oct 2016 | 
                
        
                
                    | CapeView Capital LLP | 
                    0.95% | 
                    26 Oct 2016 | 
                
        
                
                    | CapeView Capital LLP | 
                    1.07% | 
                    21 Oct 2016 | 
                
        
                
                    | CapeView Capital LLP | 
                    1.23% | 
                    20 Oct 2016 | 
                
        
                
                    | CapeView Capital LLP | 
                    1.44% | 
                    19 Oct 2016 | 
                
        
                
                    | CapeView Capital LLP | 
                    1.55% | 
                    13 Oct 2016 | 
                
        
                
                    | GLG Partners LP | 
                    2.82% | 
                    13 Oct 2016 | 
                
        
                
                    | CapeView Capital LLP | 
                    1.67% | 
                    5 Oct 2016 | 
                
        
                
                    | CapeView Capital LLP | 
                    1.58% | 
                    23 Sep 2016 | 
                
        
                
                    | CapeView Capital LLP | 
                    1.48% | 
                    21 Sep 2016 | 
                
        
                
                    | CapeView Capital LLP | 
                    1.36% | 
                    19 Sep 2016 | 
                
        
                
                    | CapeView Capital LLP | 
                    1.29% | 
                    16 Sep 2016 | 
                
        
                
                    | CapeView Capital LLP | 
                    0.97% | 
                    15 Sep 2016 | 
                
        
                
                    | GLG Partners LP | 
                    3.62% | 
                    30 Aug 2016 | 
                
        
                
                    | GLG Partners LP | 
                    3.58% | 
                    26 Aug 2016 | 
                
        
                
                    | GLG Partners LP | 
                    3.46% | 
                    25 Aug 2016 | 
                
        
                
                    | GLG Partners LP | 
                    3.10% | 
                    24 Aug 2016 | 
                
        
                
                    | GLG Partners LP | 
                    3.08% | 
                    23 Aug 2016 | 
                
        
                
                    | GLG Partners LP | 
                    2.96% | 
                    22 Aug 2016 | 
                
        
                
                    | GLG Partners LP | 
                    2.88% | 
                    19 Aug 2016 | 
                
        
                
                    | GLG Partners LP | 
                    2.51% | 
                    18 Aug 2016 | 
                
        
                
                    | GLG Partners LP | 
                    2.30% | 
                    16 Aug 2016 | 
                
        
                
                    | GLG Partners LP | 
                    2.05% | 
                    15 Aug 2016 | 
                
        
                
                    | GLG Partners LP | 
                    1.89% | 
                    12 Aug 2016 | 
                
        
                
                    | GLG Partners LP | 
                    1.68% | 
                    11 Aug 2016 | 
                
        
                
                    | GLG Partners LP | 
                    1.51% | 
                    9 Aug 2016 | 
                
        
                
                    | GLG Partners LP | 
                    1.39% | 
                    8 Aug 2016 | 
                
        
                
                    | GLG Partners LP | 
                    1.22% | 
                    5 Aug 2016 | 
                
        
                
                    | GLG Partners LP | 
                    1.12% | 
                    4 Aug 2016 | 
                
        
                
                    | GLG Partners LP | 
                    1.07% | 
                    3 Aug 2016 | 
                
        
                
                    | GLG Partners LP | 
                    0.95% | 
                    2 Aug 2016 | 
                
        
                
                    | GLG Partners LP | 
                    0.83% | 
                    28 Jul 2016 | 
                
        
                
                    | GLG Partners LP | 
                    0.75% | 
                    27 Jul 2016 | 
                
        
                
                    | GLG Partners LP | 
                    0.51% | 
                    25 Jul 2016 | 
                
        
                
                    | CapeView Capital LLP | 
                    0.87% | 
                    9 Jun 2016 | 
                
        
                
                    | CapeView Capital LLP | 
                    0.99% | 
                    3 Jun 2016 | 
                
        
                
                    | CapeView Capital LLP | 
                    1.07% | 
                    2 Jun 2016 | 
                
        
                
                    | CapeView Capital LLP | 
                    1.19% | 
                    12 May 2016 | 
                
        
                
                    | CapeView Capital LLP | 
                    1.25% | 
                    9 May 2016 | 
                
        
                
                    | Whitebox Advisors LLC | 
                    0.49% | 
                    6 May 2016 | 
                
        
                
                    | Whitebox Advisors LLC | 
                    0.56% | 
                    4 May 2016 | 
                
        
                
                    | CapeView Capital LLP | 
                    1.38% | 
                    3 May 2016 | 
                
        
                
                    | CapeView Capital LLP | 
                    1.48% | 
                    29 Apr 2016 | 
                
        
                
                    | CapeView Capital LLP | 
                    1.52% | 
                    28 Apr 2016 | 
                
        
                
                    | Whitebox Advisors LLC | 
                    0.69% | 
                    27 Apr 2016 | 
                
        
                
                    | CapeView Capital LLP | 
                    1.64% | 
                    26 Apr 2016 | 
                
        
                
                    | GLG Partners LP | 
                    0.00% | 
                    18 Apr 2016 | 
                
        
                
                    | GLG Partners LP | 
                    0.82% | 
                    15 Apr 2016 | 
                
        
                
                    | GLG Partners LP | 
                    0.99% | 
                    14 Apr 2016 | 
                
        
                
                    | CapeView Capital LLP | 
                    1.70% | 
                    13 Apr 2016 | 
                
        
                
                    | GLG Partners LP | 
                    1.34% | 
                    13 Apr 2016 | 
                
        
                
                    | CapeView Capital LLP | 
                    1.86% | 
                    11 Apr 2016 | 
                
        
                
                    | CapeView Capital LLP | 
                    1.91% | 
                    5 Apr 2016 | 
                
        
                
                    | CapeView Capital LLP | 
                    2.09% | 
                    30 Mar 2016 | 
                
        
                
                    | GLG Partners LP | 
                    1.49% | 
                    30 Mar 2016 | 
                
        
                
                    | GLG Partners LP | 
                    1.56% | 
                    29 Mar 2016 | 
                
        
                
                    | GLG Partners LP | 
                    1.82% | 
                    24 Mar 2016 | 
                
        
                
                    | GLG Partners LP | 
                    1.98% | 
                    23 Mar 2016 | 
                
        
                
                    | Whitebox Advisors LLC | 
                    0.77% | 
                    23 Mar 2016 | 
                
        
                
                    | GLG Partners LP | 
                    2.36% | 
                    22 Mar 2016 | 
                
        
                
                    | CapeView Capital LLP | 
                    2.22% | 
                    15 Mar 2016 | 
                
        
                
                    | CapeView Capital LLP | 
                    2.12% | 
                    14 Mar 2016 | 
                
        
                
                    | Oxford Asset Management | 
                    0.48% | 
                    14 Mar 2016 | 
                
        
                
                    | GLG Partners LP | 
                    3.33% | 
                    8 Mar 2016 | 
                
        
                
                    | Whitebox Advisors LLC | 
                    0.88% | 
                    8 Mar 2016 | 
                
        
                
                    | GLG Partners LP | 
                    3.20% | 
                    7 Mar 2016 | 
                
        
                
                    | GLG Partners LP | 
                    2.85% | 
                    4 Mar 2016 | 
                
        
                
                    | Oxford Asset Management | 
                    0.58% | 
                    4 Mar 2016 | 
                
        
                
                    | GLG Partners LP | 
                    2.12% | 
                    3 Mar 2016 | 
                
        
                
                    | GLG Partners LP | 
                    1.94% | 
                    29 Feb 2016 | 
                
        
                
                    | GLG Partners LP | 
                    2.03% | 
                    26 Feb 2016 | 
                
        
                
                    | Whitebox Advisors LLC | 
                    0.97% | 
                    26 Feb 2016 | 
                
        
                
                    | Oxford Asset Management | 
                    0.69% | 
                    17 Feb 2016 | 
                
        
                
                    | Whitebox Advisors LLC | 
                    1.01% | 
                    12 Feb 2016 | 
                
        
                
                    | Whitebox Advisors LLC | 
                    0.89% | 
                    11 Feb 2016 | 
                
        
                
                    | Oxford Asset Management | 
                    0.70% | 
                    10 Feb 2016 | 
                
        
                
                    | Whitebox Advisors LLC | 
                    0.61% | 
                    8 Feb 2016 | 
                
        
                
                    | Capital Fund Management SA | 
                    0.48% | 
                    5 Feb 2016 | 
                
        
                
                    | Whitebox Advisors LLC | 
                    0.55% | 
                    4 Feb 2016 | 
                
        
                
                    | CapeView Capital LLP | 
                    2.03% | 
                    28 Jan 2016 | 
                
        
                
                    | Capital Fund Management SA | 
                    0.57% | 
                    27 Jan 2016 | 
                
        
                
                    | Oxford Asset Management | 
                    0.60% | 
                    26 Jan 2016 | 
                
        
                
                    | GLG Partners LP | 
                    2.58% | 
                    21 Jan 2016 | 
                
        
                
                    | CapeView Capital LLP | 
                    1.91% | 
                    20 Jan 2016 | 
                
        
                
                    | Capital Fund Management SA | 
                    0.60% | 
                    19 Jan 2016 | 
                
        
                
                    | CapeView Capital LLP | 
                    1.82% | 
                    15 Jan 2016 | 
                
        
                
                    | Capital Fund Management SA | 
                    0.59% | 
                    15 Jan 2016 | 
                
        
                
                    | CapeView Capital LLP | 
                    1.70% | 
                    14 Jan 2016 | 
                
        
                
                    | Capital Fund Management SA | 
                    0.61% | 
                    14 Jan 2016 | 
                
        
                
                    | CapeView Capital LLP | 
                    1.51% | 
                    11 Jan 2016 | 
                
        
                
                    | Oxford Asset Management | 
                    0.50% | 
                    11 Jan 2016 | 
                
        
                
                    | CapeView Capital LLP | 
                    1.45% | 
                    7 Jan 2016 | 
                
        
                
                    | CapeView Capital LLP | 
                    1.30% | 
                    6 Jan 2016 | 
                
        
                
                    | Capital Fund Management SA | 
                    0.50% | 
                    6 Jan 2016 | 
                
        
                
                    | CapeView Capital LLP | 
                    1.23% | 
                    30 Dec 2015 | 
                
        
                
                    | CapeView Capital LLP | 
                    1.14% | 
                    21 Dec 2015 | 
                
        
                
                    | CapeView Capital LLP | 
                    1.07% | 
                    18 Dec 2015 | 
                
        
                
                    | CapeView Capital LLP | 
                    0.97% | 
                    8 Dec 2015 | 
                
        
                
                    | GLG Partners LP | 
                    2.67% | 
                    4 Dec 2015 | 
                
        
                
                    | GLG Partners LP | 
                    2.57% | 
                    3 Dec 2015 | 
                
        
                
                    | GLG Partners LP | 
                    2.41% | 
                    2 Dec 2015 | 
                
        
                
                    | GLG Partners LP | 
                    2.36% | 
                    1 Dec 2015 | 
                
        
                
                    | GLG Partners LP | 
                    2.21% | 
                    26 Nov 2015 | 
                
        
                
                    | GLG Partners LP | 
                    2.14% | 
                    25 Nov 2015 | 
                
        
                
                    | GLG Partners LP | 
                    1.91% | 
                    24 Nov 2015 | 
                
        
                
                    | GLG Partners LP | 
                    1.81% | 
                    23 Nov 2015 | 
                
        
                
                    | GLG Partners LP | 
                    1.75% | 
                    19 Nov 2015 | 
                
        
                
                    | GLG Partners LP | 
                    1.68% | 
                    18 Nov 2015 | 
                
        
                
                    | GLG Partners LP | 
                    1.50% | 
                    16 Nov 2015 | 
                
        
                
                    | GLG Partners LP | 
                    1.40% | 
                    12 Nov 2015 | 
                
        
                
                    | GLG Partners LP | 
                    1.30% | 
                    9 Nov 2015 | 
                
        
                
                    | GLG Partners LP | 
                    1.24% | 
                    6 Nov 2015 | 
                
        
                
                    | GLG Partners LP | 
                    1.05% | 
                    5 Nov 2015 | 
                
        
                
                    | GLG Partners LP | 
                    0.86% | 
                    4 Nov 2015 | 
                
        
                
                    | GLG Partners LP | 
                    0.62% | 
                    3 Nov 2015 | 
                
        
                
                    | GLG Partners LP | 
                    0.52% | 
                    29 Oct 2015 | 
                
        
                
                    | GSA Capital Partners LLP | 
                    0.46% | 
                    13 Oct 2015 | 
                
        
                
                    | Oxford Asset Management | 
                    0.49% | 
                    6 Oct 2015 | 
                
        
                
                    | CapeView Capital LLP | 
                    0.79% | 
                    29 Sep 2015 | 
                
        
                
                    | CapeView Capital LLP | 
                    0.80% | 
                    22 Sep 2015 | 
                
        
                
                    | CapeView Capital LLP | 
                    0.74% | 
                    15 Sep 2015 | 
                
        
                
                    | Oxford Asset Management | 
                    0.59% | 
                    26 Aug 2015 | 
                
        
                
                    | GSA Capital Partners LLP | 
                    0.50% | 
                    14 Aug 2015 | 
                
        
                
                    | CapeView Capital LLP | 
                    0.63% | 
                    12 Aug 2015 | 
                
        
                
                    | Sothic Capital Management LLP | 
                    0.47% | 
                    5 Aug 2015 | 
                
        
                
                    | Oxford Asset Management | 
                    0.69% | 
                    17 Jul 2015 | 
                
        
                
                    | Oxford Asset Management | 
                    0.79% | 
                    22 Jun 2015 | 
                
        
                
                    | Oxford Asset Management | 
                    0.80% | 
                    17 Jun 2015 | 
                
        
                
                    | Oxford Asset Management | 
                    0.79% | 
                    8 Jun 2015 | 
                
        
                
                    | Oxford Asset Management | 
                    0.80% | 
                    21 May 2015 | 
                
        
                
                    | Oxford Asset Management | 
                    0.78% | 
                    12 May 2015 | 
                
        
                
                    | Marshall Wace LLP | 
                    0.39% | 
                    6 May 2015 | 
                
        
                
                    | Marshall Wace LLP | 
                    0.55% | 
                    30 Apr 2015 | 
                
        
                
                    | Marshall Wace LLP | 
                    0.67% | 
                    27 Apr 2015 | 
                
        
                
                    | Sothic Capital Management LLP | 
                    0.57% | 
                    13 Apr 2015 | 
                
        
                
                    | GLG Partners LP | 
                    0.48% | 
                    10 Apr 2015 | 
                
        
                
                    | GLG Partners LP | 
                    0.54% | 
                    8 Apr 2015 | 
                
        
                
                    | TT International | 
                    0.41% | 
                    8 Apr 2015 | 
                
        
                
                    | GLG Partners LP | 
                    0.69% | 
                    7 Apr 2015 | 
                
        
                
                    | Oxford Asset Management | 
                    0.81% | 
                    7 Apr 2015 | 
                
        
                
                    | CapeView Capital LLP | 
                    0.50% | 
                    26 Mar 2015 | 
                
        
                
                    | GLG Partners LP | 
                    1.02% | 
                    26 Mar 2015 | 
                
        
                
                    | GLG Partners LP | 
                    0.80% | 
                    25 Mar 2015 | 
                
        
                
                    | GLG Partners LP | 
                    0.79% | 
                    24 Mar 2015 | 
                
        
                
                    | GLG Partners LP | 
                    0.69% | 
                    23 Mar 2015 | 
                
        
                
                    | Marshall Wace LLP | 
                    0.75% | 
                    23 Mar 2015 | 
                
        
                
                    | Oxford Asset Management | 
                    0.76% | 
                    19 Mar 2015 | 
                
        
                
                    | Sothic Capital Management LLP | 
                    0.61% | 
                    18 Mar 2015 | 
                
        
                
                    | Marshall Wace LLP | 
                    0.81% | 
                    13 Mar 2015 | 
                
        
                
                    | Marshall Wace LLP | 
                    0.72% | 
                    9 Mar 2015 | 
                
        
                
                    | Oxford Asset Management | 
                    0.80% | 
                    2 Mar 2015 | 
                
        
                
                    | Marshall Wace LLP | 
                    0.63% | 
                    24 Feb 2015 | 
                
        
                
                    | Marshall Wace LLP | 
                    0.59% | 
                    23 Feb 2015 | 
                
        
                
                    | Oxford Asset Management | 
                    0.71% | 
                    19 Feb 2015 | 
                
        
                
                    | Oxford Asset Management | 
                    0.61% | 
                    11 Feb 2015 | 
                
        
                
                    | Marshall Wace LLP | 
                    0.47% | 
                    6 Feb 2015 | 
                
        
                
                    | Marshall Wace LLP | 
                    0.59% | 
                    4 Feb 2015 | 
                
        
                
                    | Marshall Wace LLP | 
                    0.66% | 
                    3 Feb 2015 | 
                
        
                
                    | Pointstate Capital LP | 
                    0.46% | 
                    27 Jan 2015 | 
                
        
                
                    | Marshall Wace LLP | 
                    0.75% | 
                    26 Jan 2015 | 
                
        
                
                    | Pointstate Capital LP | 
                    0.56% | 
                    26 Jan 2015 | 
                
        
                
                    | Marshall Wace LLP | 
                    0.66% | 
                    23 Jan 2015 | 
                
        
                
                    | Pointstate Capital LP | 
                    0.69% | 
                    23 Jan 2015 | 
                
        
                
                    | Oxford Asset Management | 
                    0.50% | 
                    22 Jan 2015 | 
                
        
                
                    | Marshall Wace LLP | 
                    0.72% | 
                    14 Jan 2015 | 
                
        
                
                    | Pointstate Capital LP | 
                    0.76% | 
                    14 Jan 2015 | 
                
        
                
                    | Marshall Wace LLP | 
                    0.60% | 
                    13 Jan 2015 | 
                
        
                
                    | Pointstate Capital LP | 
                    0.61% | 
                    13 Jan 2015 | 
                
        
                
                    | Marshall Wace LLP | 
                    0.53% | 
                    12 Jan 2015 | 
                
        
                
                    | Pointstate Capital LP | 
                    0.51% | 
                    12 Jan 2015 | 
                
        
                
                    | TT International | 
                    0.52% | 
                    5 Jan 2015 | 
                
        
                
                    | Oslo Asset Management ASA | 
                    0.43% | 
                    27 Nov 2014 | 
                
        
                
                    | Oceanic Opportunities Master Fund L.P. | 
                    0.49% | 
                    2 May 2014 | 
                
        
                
                    | Oslo Asset Management ASA | 
                    0.51% | 
                    24 Apr 2014 | 
                
        
                
                    | Oceanic Opportunities Master Fund L.P. | 
                    0.59% | 
                    26 Feb 2014 | 
                
        
                
                    | Insight Investment Management (Global) Ltd | 
                    0.47% | 
                    29 Nov 2013 | 
                
        
                
                    | Oceanic Opportunities Master Fund L.P. | 
                    0.65% | 
                    4 Nov 2013 | 
                
        
                
                    | Oceanic Opportunities Master Fund L.P. | 
                    0.52% | 
                    31 Oct 2013 | 
                
        
                
                    | Oslo Asset Management ASA | 
                    0.66% | 
                    18 Sep 2013 | 
                
        
                
                    | Oslo Asset Management ASA | 
                    0.81% | 
                    13 Aug 2013 | 
                
        
                
                    | Oslo Asset Management ASA | 
                    0.95% | 
                    3 Jul 2013 | 
                
        
                
                    | Oslo Asset Management ASA | 
                    1.09% | 
                    28 Jun 2013 | 
                
        
                
                    | Oslo Asset Management ASA | 
                    1.22% | 
                    10 Jun 2013 | 
                
        
                
                    | Oslo Asset Management ASA | 
                    1.34% | 
                    30 May 2013 | 
                
        
                
                    | Oslo Asset Management ASA | 
                    1.45% | 
                    27 May 2013 | 
                
        
                
                    | Insight Investment Management (Global) Ltd | 
                    0.52% | 
                    26 Mar 2013 | 
                
        
                
                    | GLG Partners LP | 
                    0.44% | 
                    26 Feb 2013 | 
                
        
                
                    | GLG Partners LP | 
                    0.59% | 
                    20 Feb 2013 | 
                
        
                
                    | GLG Partners LP | 
                    0.60% | 
                    19 Feb 2013 | 
                
        
                
                    | GLG Partners LP | 
                    0.87% | 
                    7 Feb 2013 | 
                
        
                
                    | GLG Partners LP | 
                    0.99% | 
                    25 Jan 2013 | 
                
        
                
                    | Oslo Asset Management ASA | 
                    1.59% | 
                    2 Nov 2012 | 
                
        
                
                    | GLG Partners LP | 
                    1.04% | 
                    1 Nov 2012 |