| PSquared Asset Management AG | 0.00% | 4 Jun 2019 | 
        
                
                    | PSquared Asset Management AG | 1.41% | 17 May 2019 | 
        
                
                    | Marshall Wace LLP | 0.49% | 8 Apr 2019 | 
        
                
                    | Marshall Wace LLP | 0.58% | 29 Mar 2019 | 
        
                
                    | Marshall Wace LLP | 0.69% | 21 Mar 2019 | 
        
                
                    | Marshall Wace LLP | 0.79% | 14 Mar 2019 | 
        
                
                    | Marshall Wace LLP | 0.88% | 12 Mar 2019 | 
        
                
                    | Marshall Wace LLP | 0.99% | 21 Feb 2019 | 
        
                
                    | Marshall Wace LLP | 1.09% | 12 Feb 2019 | 
        
                
                    | Marshall Wace LLP | 1.16% | 5 Feb 2019 | 
        
                
                    | Marshall Wace LLP | 1.35% | 30 Jan 2019 | 
        
                
                    | Marshall Wace LLP | 0.50% | 24 Jan 2019 | 
        
                
                    | JPMorgan Asset Management (UK) Ltd | 0.48% | 22 Nov 2018 | 
        
                
                    | JPMorgan Asset Management (UK) Ltd | 0.59% | 19 Oct 2018 | 
        
                
                    | GSA Capital Partners LLP | 0.49% | 16 May 2017 | 
        
                
                    | GSA Capital Partners LLP | 0.59% | 12 Apr 2017 | 
        
                
                    | GSA Capital Partners LLP | 0.69% | 29 Mar 2017 | 
        
                
                    | GSA Capital Partners LLP | 0.79% | 3 Mar 2017 | 
        
                
                    | GSA Capital Partners LLP | 0.80% | 2 Mar 2017 | 
        
                
                    | GSA Capital Partners LLP | 0.79% | 13 Feb 2017 | 
        
                
                    | GSA Capital Partners LLP | 0.86% | 9 Feb 2017 | 
        
                
                    | GSA Capital Partners LLP | 0.92% | 13 Jan 2017 | 
        
                
                    | GSA Capital Partners LLP | 0.89% | 20 Dec 2016 | 
        
                
                    | GSA Capital Partners LLP | 0.90% | 15 Nov 2016 | 
        
                
                    | GSA Capital Partners LLP | 0.80% | 20 Oct 2016 | 
        
                
                    | GSA Capital Partners LLP | 0.70% | 30 Sep 2016 | 
        
                
                    | GSA Capital Partners LLP | 0.60% | 5 Sep 2016 | 
        
                
                    | Macquarie Funds Management Hong Kong Limited | 0.49% | 24 Aug 2016 | 
        
                
                    | GSA Capital Partners LLP | 0.51% | 21 Jul 2016 | 
        
                
                    | GSA Capital Partners LLP | 0.49% | 27 Jun 2016 | 
        
                
                    | GSA Capital Partners LLP | 0.50% | 23 Jun 2016 | 
        
                
                    | Capital Fund Management SA | 0.49% | 22 Jun 2016 | 
        
                
                    | Capital Fund Management SA | 0.50% | 13 Jun 2016 | 
        
                
                    | Macquarie Funds Management Hong Kong Limited | 0.51% | 12 May 2016 | 
        
                
                    | Macquarie Funds Management Hong Kong Limited | 0.45% | 26 Apr 2016 | 
        
                
                    | Macquarie Funds Management Hong Kong Limited | 0.52% | 21 Mar 2016 | 
        
                
                    | WorldQuant LLC | 0.49% | 22 Jan 2016 | 
        
                
                    | WorldQuant LLC | 0.50% | 14 Jan 2016 | 
        
                
                    | WorldQuant LLC | 0.49% | 24 Dec 2015 | 
        
                
                    | WorldQuant LLC | 0.59% | 9 Dec 2015 | 
        
                
                    | WorldQuant LLC | 0.66% | 4 Dec 2015 | 
        
                
                    | WorldQuant LLC | 0.78% | 3 Dec 2015 | 
        
                
                    | WorldQuant LLC | 0.86% | 27 Nov 2015 | 
        
                
                    | WorldQuant LLC | 0.98% | 6 Nov 2015 | 
        
                
                    | WorldQuant LLC | 1.00% | 20 Oct 2015 | 
        
                
                    | Oceanic Opportunities Master Fund L.P. | 0.44% | 19 Oct 2015 | 
        
                
                    | Oceanic Opportunities Master Fund L.P. | 0.59% | 14 Oct 2015 | 
        
                
                    | Oceanic Opportunities Master Fund L.P. | 0.69% | 9 Oct 2015 | 
        
                
                    | WorldQuant LLC | 0.99% | 9 Oct 2015 | 
        
                
                    | Oceanic Opportunities Master Fund L.P. | 0.76% | 8 Oct 2015 | 
        
                
                    | WorldQuant LLC | 1.08% | 8 Oct 2015 | 
        
                
                    | WorldQuant LLC | 1.21% | 7 Oct 2015 | 
        
                
                    | WorldQuant LLC | 1.37% | 5 Oct 2015 | 
        
                
                    | WorldQuant LLC | 1.45% | 1 Oct 2015 | 
        
                
                    | WorldQuant LLC | 1.51% | 28 Sep 2015 | 
        
                
                    | WorldQuant LLC | 1.41% | 15 Sep 2015 | 
        
                
                    | WorldQuant LLC | 1.30% | 11 Sep 2015 | 
        
                
                    | WorldQuant LLC | 1.25% | 10 Sep 2015 | 
        
                
                    | WorldQuant LLC | 1.13% | 7 Sep 2015 | 
        
                
                    | Oceanic Opportunities Master Fund L.P. | 0.85% | 1 Sep 2015 | 
        
                
                    | WorldQuant LLC | 1.07% | 1 Sep 2015 | 
        
                
                    | WorldQuant LLC | 1.10% | 28 Aug 2015 | 
        
                
                    | WorldQuant LLC | 1.07% | 27 Aug 2015 | 
        
                
                    | WorldQuant LLC | 0.99% | 26 Aug 2015 | 
        
                
                    | Oceanic Opportunities Master Fund L.P. | 0.76% | 25 Aug 2015 | 
        
                
                    | WorldQuant LLC | 0.89% | 25 Aug 2015 | 
        
                
                    | WorldQuant LLC | 0.79% | 24 Aug 2015 | 
        
                
                    | WorldQuant LLC | 0.67% | 21 Aug 2015 | 
        
                
                    | WorldQuant LLC | 0.56% | 20 Aug 2015 | 
        
                
                    | JPMorgan Asset Management (UK) Ltd | 0.39% | 3 Aug 2015 | 
        
                
                    | JPMorgan Asset Management (UK) Ltd | 0.55% | 21 Jul 2015 | 
        
                
                    | BlueCrest Capital Management Limited | 0.47% | 16 Apr 2015 | 
        
                
                    | BlueCrest Capital Management Limited | 0.59% | 8 Apr 2015 | 
        
                
                    | BlueCrest Capital Management Limited | 0.68% | 25 Mar 2015 | 
        
                
                    | BlackRock Institutional Trust Company, National Association | 0.48% | 23 Mar 2015 | 
        
                
                    | BlueCrest Capital Management Limited | 0.70% | 12 Mar 2015 | 
        
                
                    | BlackRock Institutional Trust Company, National Association | 0.51% | 10 Mar 2015 | 
        
                
                    | BlackRock Institutional Trust Company, National Association | 0.49% | 5 Mar 2015 | 
        
                
                    | BlueCrest Capital Management Limited | 0.66% | 4 Mar 2015 | 
        
                
                    | BlackRock Institutional Trust Company, National Association | 0.50% | 3 Mar 2015 | 
        
                
                    | BNP PARIBAS SA | 0.00% | 2 Mar 2015 | 
        
                
                    | GLG Partners LP | 0.00% | 2 Mar 2015 | 
        
                
                    | JPMorgan Asset Management (UK) Ltd | 0.45% | 2 Mar 2015 | 
        
                
                    | BNP PARIBAS SA | 0.52% | 27 Feb 2015 | 
        
                
                    | JPMorgan Asset Management (UK) Ltd | 0.56% | 19 Feb 2015 | 
        
                
                    | GLG Partners LP | 0.61% | 18 Feb 2015 | 
        
                
                    | GLG Partners LP | 0.52% | 13 Feb 2015 | 
        
                
                    | GLG Partners LP | 0.48% | 12 Feb 2015 | 
        
                
                    | GLG Partners LP | 0.50% | 11 Feb 2015 | 
        
                
                    | BlackRock Institutional Trust Company, National Association | 0.61% | 3 Feb 2015 | 
        
                
                    | BlackRock Institutional Trust Company, National Association | 0.53% | 27 Jan 2015 | 
        
                
                    | BlueCrest Capital Management Limited | 0.89% | 23 Jan 2015 | 
        
                
                    | BlueCrest Capital Management Limited | 0.92% | 1 Jan 2015 | 
        
                
                    | BlueCrest Capital Management Limited | 1.08% | 18 Dec 2014 | 
        
                
                    | BlueCrest Capital Management Limited | 1.10% | 16 Dec 2014 | 
        
                
                    | BlueCrest Capital Management Limited | 1.01% | 5 Dec 2014 | 
        
                
                    | JPMorgan Asset Management (UK) Ltd | 0.60% | 2 Dec 2014 | 
        
                
                    | BlueCrest Capital Management Limited | 0.91% | 27 Nov 2014 | 
        
                
                    | BlueCrest Capital Management Limited | 0.80% | 19 Nov 2014 | 
        
                
                    | BlueCrest Capital Management Limited | 0.78% | 13 Nov 2014 | 
        
                
                    | BlueCrest Capital Management Limited | 0.80% | 31 Oct 2014 | 
        
                
                    | JPMorgan Asset Management (UK) Ltd | 0.53% | 30 Oct 2014 | 
        
                
                    | BlueCrest Capital Management Limited | 0.70% | 24 Oct 2014 | 
        
                
                    | BlueCrest Capital Management Limited | 0.60% | 17 Oct 2014 | 
        
                
                    | BlueCrest Capital Management Limited | 0.50% | 13 Oct 2014 | 
        
                
                    | Lansdowne Partners Limited* | 0.26% | 4 Jun 2014 | 
        
                
                    | Lansdowne Partners Limited* | 0.84% | 28 May 2014 | 
        
                
                    | Lansdowne Partners Limited* | 1.30% | 27 May 2014 | 
        
                
                    | Lansdowne Partners Limited* | 1.44% | 23 May 2014 | 
        
                
                    | Lansdowne Partners Limited* | 1.66% | 20 May 2014 | 
        
                
                    | Lansdowne Partners Limited* | 1.74% | 16 May 2014 | 
        
                
                    | Lansdowne Partners Limited* | 1.94% | 13 May 2014 | 
        
                
                    | Lansdowne Partners Limited* | 2.05% | 12 May 2014 | 
        
                
                    | Lansdowne Partners Limited* | 2.34% | 23 Apr 2014 | 
        
                
                    | Lansdowne Partners Limited* | 2.99% | 1 Aug 2013 | 
        
                
                    | Lansdowne Partners Limited* | 3.00% | 21 May 2013 | 
        
                
                    | Lansdowne Partners Limited* | 2.90% | 13 May 2013 | 
        
                
                    | Lansdowne Partners Limited* | 2.88% | 9 May 2013 | 
        
                
                    | Lansdowne Partners Limited* | 2.71% | 1 May 2013 | 
        
                
                    | Lansdowne Partners Limited* | 2.45% | 30 Apr 2013 | 
        
                
                    | Lansdowne Partners Limited* | 2.36% | 29 Apr 2013 | 
        
                
                    | Lansdowne Partners Limited* | 2.22% | 25 Apr 2013 | 
        
                
                    | Lansdowne Partners Limited* | 2.14% | 24 Apr 2013 | 
        
                
                    | Lansdowne Partners Limited* | 2.02% | 17 Apr 2013 | 
        
                
                    | Lansdowne Partners Limited* | 1.89% | 26 Mar 2013 | 
        
                
                    | Lansdowne Partners Limited* | 1.95% | 8 Mar 2013 | 
        
                
                    | Lansdowne Partners Limited* | 2.04% | 6 Mar 2013 | 
        
                
                    | Lansdowne Partners Limited* | 1.97% | 5 Mar 2013 | 
        
                
                    | Lansdowne Partners Limited* | 1.80% | 11 Feb 2013 | 
        
                
                    | Lansdowne Partners Limited* | 1.71% | 8 Feb 2013 | 
        
                
                    | Lansdowne Partners Limited* | 1.09% | 1 Nov 2012 |