| 
    
        
            | 
                    Closing price on 4/10/2012
                 |  |  
    
        |           
                
                    | Open | 5.90 |  
                    | High | 6.30 |  
                    | Low | 5.90 |  
                    | Volume | 16,000 |  
                    | Split-adjusted Price | 6.00 |  
                
             | 
 |  SD1 Historical Quote 
            
                | Date | Change | Open | High | Low | Close | Average | Adjusted Close | Volume |  |  			
            | 4/10/2012 | -0.40 / -6.25% | 5.90 | 6.30 | 5.90 | 6.00 | 6.00 | 6.00 | 16,000 |   |  
            | 4/9/2012 | -0.20 / -3.03% | 6.30 | 6.40 | 6.20 | 6.40 | 6.40 | 6.40 | 20,300 |   |  			
            | 4/6/2012 | -0.10 / -1.49% | 6.60 | 6.60 | 6.30 | 6.60 | 6.53 | 6.60 | 18,700 |   |  
            | 4/5/2012 | 0.00 / 0.00% | 6.70 | 6.70 | 6.60 | 6.70 | 6.70 | 6.70 | 4,300 |   |  			
            | 4/4/2012 | -0.10 / -1.47% | 6.80 | 6.80 | 6.40 | 6.70 | 6.70 | 6.70 | 6,300 |   |  
            | 4/3/2012 | +0.10 / +1.49% | 6.30 | 6.80 | 6.30 | 6.80 | 6.80 | 6.80 | 2,500 |   |  			
            | 3/30/2012 | +0.20 / +3.08% | 6.50 | 6.70 | 6.30 | 6.70 | 6.50 | 6.70 | 10,600 |   |  
            | 3/29/2012 | -0.30 / -4.41% | 6.80 | 6.90 | 6.50 | 6.50 | 6.50 | 6.50 | 27,500 |   |  			
            | 3/28/2012 | 0.00 / 0.00% | 6.60 | 7.20 | 6.50 | 6.80 | 6.80 | 6.80 | 30,100 |   |  
            | 3/27/2012 | +0.10 / +1.49% | 6.90 | 7.10 | 6.80 | 6.80 | 6.80 | 6.80 | 58,500 |   |  			
            | 3/26/2012 | +0.30 / +4.69% | 6.70 | 6.70 | 6.70 | 6.70 | 6.70 | 6.70 | 22,600 |   |  
            | 3/23/2012 | +0.10 / +1.59% | 6.10 | 6.40 | 6.10 | 6.40 | 6.30 | 6.40 | 46,600 |   |  			
            | 3/22/2012 | -0.20 / -3.08% | 6.50 | 6.50 | 6.00 | 6.30 | 6.30 | 6.30 | 30,100 |   |  
            | 3/21/2012 | 0.00 / 0.00% | 6.70 | 6.70 | 6.20 | 6.50 | 6.50 | 6.50 | 27,300 |   |  			
            | 3/20/2012 | +0.10 / +1.56% | 6.40 | 6.50 | 6.10 | 6.50 | 6.50 | 6.50 | 4,900 |   |  
            | 3/19/2012 | +0.10 / +1.59% | 6.40 | 6.40 | 6.40 | 6.40 | 6.40 | 6.40 | 100 |   |  			
            | 3/16/2012 | +0.20 / +3.28% | 6.20 | 6.30 | 6.20 | 6.30 | 6.25 | 6.30 | 11,600 |   |  
            | 3/15/2012 | +0.10 / +1.67% | 6.10 | 6.10 | 6.00 | 6.10 | 6.10 | 6.10 | 24,600 |   |  			
            | 3/14/2012 | -0.10 / -1.64% | 6.30 | 6.30 | 6.00 | 6.00 | 6.00 | 6.00 | 3,200 |   |  
            | 3/13/2012 | +0.30 / +5.17% | 6.20 | 6.20 | 6.00 | 6.10 | 6.10 | 6.10 | 9,400 |   |  			
            | 3/12/2012 | -0.20 / -3.33% | 5.80 | 5.80 | 5.80 | 5.80 | 5.80 | 5.80 | 14,100 |   |  
            | 3/9/2012 | -0.30 / -4.76% | 6.10 | 6.10 | 5.90 | 6.00 | 6.03 | 6.00 | 11,400 |   |  			
            | 3/8/2012 | -0.60 / -8.70% | 6.40 | 6.40 | 6.30 | 6.30 | 6.30 | 6.30 | 18,800 |   |  
            | 3/7/2012 | 0.00 / 0.00% | 6.70 | 6.90 | 6.70 | 6.90 | 6.90 | 6.90 | 15,100 |   |  			
            | 3/6/2012 | -0.10 / -1.43% | 7.40 | 7.40 | 6.90 | 6.90 | 6.90 | 6.90 | 6,500 |   |  
            | 3/5/2012 | +0.40 / +6.06% | 6.80 | 7.00 | 6.80 | 7.00 | 7.00 | 7.00 | 55,700 |   |  			
            | 3/2/2012 | +0.10 / +1.54% | 6.70 | 6.70 | 6.40 | 6.60 | 6.50 | 6.60 | 17,800 |   |  
            | 3/1/2012 | -0.40 / -5.80% | 7.20 | 7.20 | 6.50 | 6.50 | 6.50 | 6.50 | 2,500 |   |  			
            | 2/29/2012 | +0.90 / +15.00% | 6.90 | 6.90 | 6.90 | 6.90 | 6.90 | 6.90 | 100 |   |  
            | 2/28/2012 | -0.40 / -6.25% | 6.60 | 6.70 | 6.00 | 6.00 | 6.00 | 6.00 | 44,800 |   |  |