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                    Closing price on 5/15/2012
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                    | Open | 7.20 |  
                    | High | 7.50 |  
                    | Low | 7.20 |  
                    | Volume | 70,900 |  
                    | Split-adjusted Price | 7.50 |  
                
             | 
 |  SD1 Historical Quote 
            
                | Date | Change | Open | High | Low | Close | Average | Adjusted Close | Volume |  |  			
            | 5/15/2012 | -0.20 / -2.60% | 7.20 | 7.50 | 7.20 | 7.50 | 7.50 | 7.50 | 70,900 |   |  
            | 5/14/2012 | -0.50 / -6.10% | 7.70 | 7.80 | 7.70 | 7.70 | 7.70 | 7.70 | 78,100 |   |  			
            | 5/11/2012 | -0.60 / -6.82% | 8.20 | 8.80 | 8.20 | 8.20 | 8.80 | 8.20 | 95,400 |   |  
            | 5/10/2012 | +0.30 / +3.53% | 8.30 | 8.90 | 8.30 | 8.80 | 8.80 | 8.80 | 39,400 |   |  			
            | 5/9/2012 | +0.60 / +7.59% | 7.90 | 8.50 | 7.90 | 8.50 | 8.50 | 8.50 | 72,800 |   |  
            | 5/8/2012 | -0.50 / -5.95% | 8.50 | 8.90 | 7.90 | 7.90 | 7.90 | 7.90 | 55,300 |   |  			
            | 5/7/2012 | +0.50 / +6.33% | 8.00 | 8.40 | 8.00 | 8.40 | 8.40 | 8.40 | 59,600 |   |  
            | 5/4/2012 | +0.40 / +5.33% | 7.60 | 7.90 | 7.60 | 7.90 | 7.75 | 7.90 | 77,300 |   |  			
            | 5/3/2012 | +0.40 / +5.63% | 7.20 | 7.50 | 6.90 | 7.50 | 7.50 | 7.50 | 173,100 |   |  
            | 5/2/2012 | +0.40 / +5.97% | 7.00 | 7.10 | 7.00 | 7.10 | 7.10 | 7.10 | 125,375 |   |  			
            | 4/27/2012 | 0.00 / 0.00% | 6.60 | 6.70 | 6.60 | 6.70 | 6.70 | 6.70 | 11,000 |   |  
            | 4/26/2012 | -0.10 / -1.47% | 6.60 | 6.70 | 6.60 | 6.70 | 6.70 | 6.70 | 9,100 |   |  			
            | 4/25/2012 | +0.40 / +6.25% | 6.50 | 6.80 | 6.50 | 6.80 | 6.80 | 6.80 | 11,000 |   |  
            | 4/24/2012 | -0.20 / -3.03% | 6.40 | 6.50 | 6.30 | 6.40 | 6.40 | 6.40 | 11,900 |   |  			
            | 4/23/2012 | +0.20 / +3.13% | 6.40 | 6.60 | 6.40 | 6.60 | 6.60 | 6.60 | 5,800 |   |  
            | 4/20/2012 | -0.10 / -1.54% | 6.60 | 6.60 | 6.40 | 6.40 | 6.50 | 6.40 | 3,000 |   |  			
            | 4/19/2012 | -0.10 / -1.52% | 6.40 | 6.50 | 6.40 | 6.50 | 6.50 | 6.50 | 30,800 |   |  
            | 4/18/2012 | -0.10 / -1.49% | 6.70 | 6.70 | 6.60 | 6.60 | 6.60 | 6.60 | 13,000 |   |  			
            | 4/17/2012 | 0.00 / 0.00% | 6.70 | 6.80 | 6.60 | 6.70 | 6.70 | 6.70 | 26,100 |   |  
            | 4/16/2012 | +0.20 / +3.08% | 6.50 | 6.70 | 6.40 | 6.70 | 6.70 | 6.70 | 39,400 |   |  			
            | 4/13/2012 | -0.20 / -2.99% | 6.90 | 6.90 | 6.40 | 6.50 | 6.70 | 6.50 | 12,900 |   |  
            | 4/12/2012 | +0.30 / +4.69% | 6.20 | 6.70 | 6.20 | 6.70 | 6.70 | 6.70 | 67,300 |   |  			
            | 4/11/2012 | +0.40 / +6.67% | 6.10 | 6.40 | 6.10 | 6.40 | 6.40 | 6.40 | 5,400 |   |  
            | 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 |   |  |