| 
                 
                    Closing price on 9/20/2011
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    9.30 | 
                 
                
                    | High | 
                    10.20 | 
                 
                
                    | Low | 
                    9.30 | 
                     
                
                    | Volume | 
                    73,700 | 
                                 
                
                    | Split-adjusted Price | 
                    4.29 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
SD2 Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                9/20/2011
             | 
            
                -0.30 / -3.00%
             |             
            
                9.30
             |           
            
                10.20
             |               
            
                9.30
             |                           
            
                9.70
             | 
            
                9.86
             |                     
            
                4.29
             |                                 
            
                73,700
             |            
            
                 
             |                                       
         
    
        
            | 
                9/19/2011
             | 
            
                +0.20 / +2.04%
             |             
            
                10.10
             |           
            
                10.10
             |               
            
                9.40
             |                           
            
                10.00
             | 
            
                9.91
             |                     
            
                4.43
             |                                 
            
                44,700
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/16/2011
             | 
            
                -0.70 / -6.67%
             |             
            
                10.70
             |           
            
                10.70
             |               
            
                9.80
             |                           
            
                9.80
             | 
            
                9.91
             |                     
            
                4.34
             |                                 
            
                99,200
             |            
            
                 
             |                                       
         
    
        
            | 
                9/15/2011
             | 
            
                -0.20 / -1.87%
             |             
            
                10.60
             |           
            
                11.00
             |               
            
                10.50
             |                           
            
                10.50
             | 
            
                10.52
             |                     
            
                4.65
             |                                 
            
                109,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/14/2011
             | 
            
                0.00 / 0.00%
             |             
            
                11.40
             |           
            
                11.40
             |               
            
                10.70
             |                           
            
                10.70
             | 
            
                11.24
             |                     
            
                4.74
             |                                 
            
                247,700
             |            
            
                 
             |                                       
         
    
        
            | 
                9/13/2011
             | 
            
                +0.70 / +7.00%
             |             
            
                10.70
             |           
            
                10.70
             |               
            
                10.70
             |                           
            
                10.70
             | 
            
                10.70
             |                     
            
                4.74
             |                                 
            
                69,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/12/2011
             | 
            
                +0.60 / +6.38%
             |             
            
                9.60
             |           
            
                10.00
             |               
            
                9.60
             |                           
            
                10.00
             | 
            
                9.98
             |                     
            
                4.43
             |                                 
            
                110,200
             |            
            
                 
             |                                       
         
    
        
            | 
                9/9/2011
             | 
            
                0.00 / 0.00%
             |             
            
                9.00
             |           
            
                9.60
             |               
            
                9.00
             |                           
            
                9.40
             | 
            
                9.45
             |                     
            
                4.16
             |                                 
            
                91,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/8/2011
             | 
            
                0.00 / 0.00%
             |             
            
                9.80
             |           
            
                9.80
             |               
            
                9.10
             |                           
            
                9.40
             | 
            
                9.42
             |                     
            
                4.16
             |                                 
            
                64,200
             |            
            
                 
             |                                       
         
    
        
            | 
                9/7/2011
             | 
            
                +0.30 / +3.30%
             |             
            
                9.70
             |           
            
                9.70
             |               
            
                9.10
             |                           
            
                9.40
             | 
            
                9.26
             |                     
            
                4.16
             |                                 
            
                19,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/6/2011
             | 
            
                -0.10 / -1.09%
             |             
            
                9.10
             |           
            
                9.10
             |               
            
                9.10
             |                           
            
                9.10
             | 
            
                9.10
             |                     
            
                4.03
             |                                 
            
                0
             |            
            
                 
             |                                       
         
    
        
            | 
                9/5/2011
             | 
            
                0.00 / 0.00%
             |             
            
                9.20
             |           
            
                9.30
             |               
            
                9.00
             |                           
            
                9.20
             | 
            
                9.08
             |                     
            
                4.07
             |                                 
            
                65,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/1/2011
             | 
            
                +0.10 / +1.10%
             |             
            
                9.00
             |           
            
                9.40
             |               
            
                8.90
             |                           
            
                9.20
             | 
            
                9.12
             |                     
            
                4.07
             |                                 
            
                49,300
             |            
            
                 
             |                                       
         
    
        
            | 
                8/31/2011
             | 
            
                +0.10 / +1.11%
             |             
            
                9.20
             |           
            
                9.30
             |               
            
                8.90
             |                           
            
                9.10
             | 
            
                9.06
             |                     
            
                4.03
             |                                 
            
                15,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/30/2011
             | 
            
                +0.30 / +3.45%
             |             
            
                9.20
             |           
            
                9.30
             |               
            
                8.80
             |                           
            
                9.00
             | 
            
                9.22
             |                     
            
                3.98
             |                                 
            
                42,500
             |            
            
                 
             |                                       
         
    
        
            | 
                8/29/2011
             | 
            
                +0.60 / +7.41%
             |             
            
                8.50
             |           
            
                8.70
             |               
            
                8.50
             |                           
            
                8.70
             | 
            
                8.69
             |                     
            
                3.85
             |                                 
            
                48,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/26/2011
             | 
            
                -0.40 / -4.71%
             |             
            
                8.50
             |           
            
                8.50
             |               
            
                8.10
             |                           
            
                8.10
             | 
            
                8.17
             |                     
            
                3.59
             |                                 
            
                16,200
             |            
            
                 
             |                                       
         
    
        
            | 
                8/25/2011
             | 
            
                +0.40 / +4.94%
             |             
            
                8.50
             |           
            
                8.60
             |               
            
                8.40
             |                           
            
                8.50
             | 
            
                8.49
             |                     
            
                3.76
             |                                 
            
                8,200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/24/2011
             | 
            
                -0.40 / -4.71%
             |             
            
                8.80
             |           
            
                8.80
             |               
            
                8.10
             |                           
            
                8.10
             | 
            
                8.45
             |                     
            
                3.59
             |                                 
            
                19,100
             |            
            
                 
             |                                       
         
    
        
            | 
                8/23/2011
             | 
            
                -0.20 / -2.30%
             |             
            
                8.70
             |           
            
                8.70
             |               
            
                8.50
             |                           
            
                8.50
             | 
            
                8.53
             |                     
            
                3.76
             |                                 
            
                1,200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/22/2011
             | 
            
                +0.50 / +6.10%
             |             
            
                8.60
             |           
            
                8.70
             |               
            
                8.60
             |                           
            
                8.70
             | 
            
                8.69
             |                     
            
                3.85
             |                                 
            
                33,300
             |            
            
                 
             |                                       
         
    
        
            | 
                8/19/2011
             | 
            
                -0.50 / -5.75%
             |             
            
                8.50
             |           
            
                8.50
             |               
            
                8.10
             |                           
            
                8.20
             | 
            
                8.21
             |                     
            
                3.63
             |                                 
            
                5,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/18/2011
             | 
            
                +0.10 / +1.16%
             |             
            
                8.90
             |           
            
                8.90
             |               
            
                8.50
             |                           
            
                8.70
             | 
            
                8.66
             |                     
            
                3.85
             |                                 
            
                11,300
             |            
            
                 
             |                                       
         
    
        
            | 
                8/17/2011
             | 
            
                +0.50 / +6.17%
             |             
            
                8.50
             |           
            
                8.60
             |               
            
                8.10
             |                           
            
                8.60
             | 
            
                8.54
             |                     
            
                3.81
             |                                 
            
                25,600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/16/2011
             | 
            
                +0.10 / +1.25%
             |             
            
                8.50
             |           
            
                8.50
             |               
            
                8.10
             |                           
            
                8.10
             | 
            
                8.13
             |                     
            
                3.59
             |                                 
            
                12,000
             |            
            
                 
             |                                       
         
    
        
            | 
                8/15/2011
             | 
            
                -0.40 / -4.76%
             |             
            
                8.40
             |           
            
                8.40
             |               
            
                8.00
             |                           
            
                8.00
             | 
            
                8.07
             |                     
            
                3.54
             |                                 
            
                22,200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/12/2011
             | 
            
                +0.40 / +5.00%
             |             
            
                8.40
             |           
            
                8.40
             |               
            
                8.40
             |                           
            
                8.40
             | 
            
                8.40
             |                     
            
                3.72
             |                                 
            
                100
             |            
            
                 
             |                                       
         
    
        
            | 
                8/11/2011
             | 
            
                0.00 / 0.00%
             |             
            
                7.90
             |           
            
                8.10
             |               
            
                7.90
             |                           
            
                8.00
             | 
            
                8.01
             |                     
            
                3.54
             |                                 
            
                23,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/10/2011
             | 
            
                +0.20 / +2.56%
             |             
            
                8.00
             |           
            
                8.00
             |               
            
                8.00
             |                           
            
                8.00
             | 
            
                8.00
             |                     
            
                3.54
             |                                 
            
                6,000
             |            
            
                 
             |                                       
         
    
        
            | 
                8/9/2011
             | 
            
                -0.20 / -2.50%
             |             
            
                8.00
             |           
            
                8.00
             |               
            
                7.70
             |                           
            
                7.80
             | 
            
                7.82
             |                     
            
                3.45
             |                                 
            
                28,700
             |  
            
                 
             |                                                              
             
    
         
    
    
 |