| GSA Capital Partners LLP | 0.49% | 1 Apr 2016 | 
        
                
                    | GSA Capital Partners LLP | 0.50% | 8 Mar 2016 | 
        
                
                    | GSA Capital Partners LLP | 0.49% | 2 Mar 2016 | 
        
                
                    | BlackRock Investment Management (UK) Limited | 0.49% | 8 Dec 2015 | 
        
                
                    | GSA Capital Partners LLP | 0.50% | 8 Oct 2015 | 
        
                
                    | GSA Capital Partners LLP | 0.49% | 2 Oct 2015 | 
        
                
                    | BlackRock Investment Management (UK) Limited | 0.51% | 2 Sep 2015 | 
        
                
                    | GSA Capital Partners LLP | 0.50% | 27 Aug 2015 | 
        
                
                    | BlackRock Investment Management (UK) Limited | 0.48% | 18 May 2015 | 
        
                
                    | BlackRock Investment Management (UK) Limited | 0.58% | 28 Apr 2015 | 
        
                
                    | BlackRock Investment Management (UK) Limited | 0.68% | 21 Apr 2015 | 
        
                
                    | BlackRock Investment Management (UK) Limited | 0.75% | 27 Mar 2015 | 
        
                
                    | BlackRock Investment Management (UK) Limited | 0.81% | 18 Mar 2015 | 
        
                
                    | BlackRock Investment Management (UK) Limited | 0.79% | 3 Mar 2015 | 
        
                
                    | BlackRock Investment Management (UK) Limited | 0.81% | 21 Jan 2015 | 
        
                
                    | BlackRock Investment Management (UK) Limited | 0.71% | 7 Jan 2015 | 
        
                
                    | BlackRock Investment Management (UK) Limited | 0.69% | 19 Dec 2014 | 
        
                
                    | BlackRock Investment Management (UK) Limited | 0.75% | 16 Dec 2014 | 
        
                
                    | BlackRock Investment Management (UK) Limited | 0.82% | 5 Dec 2014 | 
        
                
                    | BlackRock Investment Management (UK) Limited | 0.78% | 2 Dec 2014 | 
        
                
                    | BlackRock Investment Management (UK) Limited | 0.80% | 27 Nov 2014 | 
        
                
                    | BlackRock Investment Management (UK) Limited | 0.77% | 26 Nov 2014 | 
        
                
                    | BlackRock Investment Management (UK) Limited | 0.84% | 29 Oct 2014 | 
        
                
                    | BlackRock Investment Management (UK) Limited | 0.70% | 22 Oct 2014 | 
        
                
                    | BlackRock Investment Management (UK) Limited | 0.61% | 17 Oct 2014 | 
        
                
                    | BlackRock Investment Management (UK) Limited | 0.51% | 16 Oct 2014 | 
        
                
                    | BlackRock Investment Management (UK) Limited | 0.47% | 7 Oct 2014 | 
        
                
                    | BlackRock Investment Management (UK) Limited | 0.53% | 29 Sep 2014 | 
        
                
                    | BlackRock Investment Management (UK) Limited | 0.60% | 25 Sep 2014 | 
        
                
                    | BlackRock Investment Management (UK) Limited | 0.56% | 1 Sep 2014 | 
        
                
                    | BlackRock Investment Management (UK) Limited | 0.61% | 8 Aug 2014 | 
        
                
                    | BlackRock Investment Management (UK) Limited | 0.51% | 6 Aug 2014 | 
        
                
                    | BlackRock Investment Management (UK) Limited | 0.35% | 19 Dec 2013 | 
        
                
                    | BlackRock Investment Management (UK) Limited | 0.62% | 23 Oct 2013 |