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                    Closing price on 3/31/2010
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        |           
                
                    | Open | 23.70 |  
                    | High | 23.70 |  
                    | Low | 22.80 |  
                    | Volume | 31,600 |  
                    | Split-adjusted Price | 23.00 |  
                
             | 
 |  SDD Historical Quote 
            
                | Date | Change | Open | High | Low | Close | Average | Adjusted Close | Volume |  |  			
            | 3/31/2010 | -0.20 / -0.86% | 23.70 | 23.70 | 22.80 | 23.00 | 23.19 | 23.00 | 31,600 |   |  
            | 3/30/2010 | -0.80 / -3.33% | 24.00 | 24.00 | 23.00 | 23.20 | 23.67 | 23.20 | 44,700 |   |  			
            | 3/29/2010 | +0.10 / +0.42% | 23.50 | 24.20 | 22.30 | 24.00 | 23.86 | 24.00 | 31,600 |   |  
            | 3/26/2010 | +0.30 / +1.27% | 24.00 | 24.10 | 23.30 | 23.90 | 23.77 | 23.90 | 51,400 |   |  			
            | 3/25/2010 | -1.30 / -5.22% | 23.50 | 24.40 | 23.50 | 23.60 | 23.80 | 23.60 | 68,200 |   |  
            | 3/24/2010 | +0.80 / +3.32% | 25.20 | 25.20 | 24.30 | 24.90 | 24.80 | 24.90 | 54,200 |   |  			
            | 3/23/2010 | -1.30 / -5.12% | 24.50 | 25.10 | 24.00 | 24.10 | 24.29 | 24.10 | 85,900 |   |  
            | 3/22/2010 | +0.40 / +1.60% | 24.30 | 26.00 | 24.30 | 25.40 | 25.23 | 25.40 | 52,400 |   |  			
            | 3/19/2010 | -0.70 / -2.72% | 25.50 | 25.60 | 24.90 | 25.00 | 25.18 | 25.00 | 59,200 |   |  
            | 3/18/2010 | +0.90 / +3.63% | 25.70 | 25.80 | 24.60 | 25.70 | 25.30 | 25.70 | 107,100 |   |  			
            | 3/17/2010 | -0.60 / -2.36% | 25.60 | 26.00 | 24.10 | 24.80 | 24.83 | 24.80 | 147,000 |   |  
            | 3/16/2010 | -1.50 / -5.58% | 26.60 | 27.00 | 25.40 | 25.40 | 25.71 | 25.40 | 190,600 |   |  			
            | 3/15/2010 | -0.30 / -1.10% | 28.50 | 28.50 | 26.50 | 26.90 | 27.31 | 26.90 | 97,000 |   |  
            | 3/12/2010 | +0.20 / +0.74% | 28.00 | 28.00 | 26.70 | 27.20 | 27.27 | 27.20 | 100,100 |   |  			
            | 3/11/2010 | +0.60 / +2.27% | 27.00 | 27.90 | 26.50 | 27.00 | 27.28 | 27.00 | 188,700 |   |  
            | 3/10/2010 | +0.20 / +0.76% | 26.70 | 27.00 | 25.30 | 26.40 | 26.22 | 26.40 | 177,200 |   |  			
            | 3/9/2010 | -1.00 / -3.68% | 26.80 | 27.20 | 25.90 | 26.20 | 26.36 | 26.20 | 133,500 |   |  
            | 3/8/2010 | 0.00 / 0.00% | 28.50 | 28.90 | 27.00 | 27.20 | 27.39 | 27.20 | 117,400 |   |  			
            | 3/5/2010 | +0.60 / +2.26% | 27.40 | 27.50 | 26.50 | 27.20 | 27.06 | 27.20 | 122,500 |   |  
            | 3/4/2010 | 0.00 / 0.00% | 27.40 | 27.80 | 26.10 | 26.60 | 27.42 | 26.60 | 173,300 |   |  			
            | 3/3/2010 | +1.80 / +7.26% | 25.00 | 26.60 | 24.70 | 26.60 | 25.97 | 26.60 | 228,400 |   |  
            | 3/2/2010 | -0.10 / -0.40% | 25.00 | 25.20 | 24.20 | 24.80 | 24.86 | 24.80 | 200,800 |   |  			
            | 3/1/2010 | +1.40 / +5.96% | 22.30 | 24.90 | 22.30 | 24.90 | 23.86 | 24.90 | 98,900 |   |  
            | 2/26/2010 | +0.30 / +1.29% | 23.40 | 23.60 | 23.00 | 23.50 | 23.45 | 23.50 | 26,000 |   |  			
            | 2/25/2010 | +0.10 / +0.43% | 23.80 | 23.90 | 23.00 | 23.20 | 23.53 | 23.20 | 21,600 |   |  
            | 2/24/2010 | +0.10 / +0.43% | 22.70 | 23.20 | 22.70 | 23.10 | 22.93 | 23.10 | 57,700 |   |  			
            | 2/23/2010 | -1.10 / -4.56% | 22.80 | 23.80 | 22.70 | 23.00 | 22.89 | 23.00 | 25,400 |   |  
            | 2/22/2010 | +1.00 / +4.33% | 24.00 | 25.00 | 23.70 | 24.10 | 24.24 | 24.10 | 67,900 |   |  			
            | 2/12/2010 | +0.10 / +0.43% | 23.70 | 23.80 | 23.00 | 23.10 | 23.60 | 23.10 | 15,300 |   |  
            | 2/11/2010 | +0.30 / +1.32% | 22.00 | 23.00 | 22.00 | 23.00 | 22.61 | 23.00 | 51,000 |   |  |