| 
                 
                    Closing price on 4/24/2012
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    10.10 | 
                 
                
                    | High | 
                    10.10 | 
                 
                
                    | Low | 
                    9.50 | 
                     
                
                    | Volume | 
                    39,300 | 
                                 
                
                    | Split-adjusted Price | 
                    4.47 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
SD2 Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                4/24/2012
             | 
            
                +0.20 / +2.02%
             |             
            
                10.10
             |           
            
                10.10
             |               
            
                9.50
             |                           
            
                10.10
             | 
            
                9.95
             |                     
            
                4.47
             |                                 
            
                39,300
             |            
            
                 
             |                                       
         
    
        
            | 
                4/23/2012
             | 
            
                +0.10 / +1.02%
             |             
            
                10.10
             |           
            
                10.20
             |               
            
                9.80
             |                           
            
                9.90
             | 
            
                9.90
             |                     
            
                4.38
             |                                 
            
                23,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/20/2012
             | 
            
                +0.10 / +1.03%
             |             
            
                9.80
             |           
            
                9.90
             |               
            
                9.70
             |                           
            
                9.80
             | 
            
                9.81
             |                     
            
                4.34
             |                                 
            
                73,633
             |            
            
                 
             |                                       
         
    
        
            | 
                4/19/2012
             | 
            
                -0.60 / -5.83%
             |             
            
                10.00
             |           
            
                10.30
             |               
            
                9.70
             |                           
            
                9.70
             | 
            
                10.00
             |                     
            
                4.29
             |                                 
            
                135,933
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/18/2012
             | 
            
                0.00 / 0.00%
             |             
            
                10.20
             |           
            
                10.50
             |               
            
                9.90
             |                           
            
                10.30
             | 
            
                10.27
             |                     
            
                4.56
             |                                 
            
                147,302
             |            
            
                 
             |                                       
         
    
        
            | 
                4/17/2012
             | 
            
                0.00 / 0.00%
             |             
            
                10.30
             |           
            
                10.70
             |               
            
                10.30
             |                           
            
                10.30
             | 
            
                10.44
             |                     
            
                4.56
             |                                 
            
                92,200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/16/2012
             | 
            
                +0.50 / +5.10%
             |             
            
                9.20
             |           
            
                10.30
             |               
            
                9.20
             |                           
            
                10.30
             | 
            
                10.11
             |                     
            
                4.56
             |                                 
            
                68,800
             |            
            
                 
             |                                       
         
    
        
            | 
                4/13/2012
             | 
            
                -0.50 / -4.85%
             |             
            
                10.20
             |           
            
                10.20
             |               
            
                9.80
             |                           
            
                9.80
             | 
            
                9.99
             |                     
            
                4.34
             |                                 
            
                92,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/12/2012
             | 
            
                +0.40 / +4.04%
             |             
            
                10.20
             |           
            
                10.40
             |               
            
                10.00
             |                           
            
                10.30
             | 
            
                10.18
             |                     
            
                4.56
             |                                 
            
                195,400
             |            
            
                 
             |                                       
         
    
        
            | 
                4/11/2012
             | 
            
                +0.50 / +5.32%
             |             
            
                9.20
             |           
            
                9.90
             |               
            
                9.20
             |                           
            
                9.90
             | 
            
                9.67
             |                     
            
                4.38
             |                                 
            
                105,200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/10/2012
             | 
            
                -0.10 / -1.05%
             |             
            
                9.50
             |           
            
                9.80
             |               
            
                9.10
             |                           
            
                9.40
             | 
            
                9.31
             |                     
            
                4.16
             |                                 
            
                63,400
             |            
            
                 
             |                                       
         
    
        
            | 
                4/9/2012
             | 
            
                +0.40 / +4.40%
             |             
            
                9.40
             |           
            
                9.50
             |               
            
                9.10
             |                           
            
                9.50
             | 
            
                9.33
             |                     
            
                4.21
             |                                 
            
                95,666
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/6/2012
             | 
            
                0.00 / 0.00%
             |             
            
                9.20
             |           
            
                9.30
             |               
            
                9.00
             |                           
            
                9.10
             | 
            
                9.12
             |                     
            
                4.03
             |                                 
            
                85,866
             |            
            
                 
             |                                       
         
    
        
            | 
                4/5/2012
             | 
            
                +0.30 / +3.41%
             |             
            
                8.60
             |           
            
                9.20
             |               
            
                8.60
             |                           
            
                9.10
             | 
            
                8.94
             |                     
            
                4.03
             |                                 
            
                68,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/4/2012
             | 
            
                -0.20 / -2.22%
             |             
            
                9.00
             |           
            
                9.00
             |               
            
                8.50
             |                           
            
                8.80
             | 
            
                8.71
             |                     
            
                3.90
             |                                 
            
                77,166
             |            
            
                 
             |                                       
         
    
        
            | 
                4/3/2012
             | 
            
                +0.50 / +5.88%
             |             
            
                8.50
             |           
            
                9.00
             |               
            
                8.50
             |                           
            
                9.00
             | 
            
                8.71
             |                     
            
                3.98
             |                                 
            
                101,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/30/2012
             | 
            
                -0.50 / -5.56%
             |             
            
                8.90
             |           
            
                8.90
             |               
            
                8.50
             |                           
            
                8.50
             | 
            
                8.57
             |                     
            
                3.76
             |                                 
            
                67,900
             |            
            
                 
             |                                       
         
    
        
            | 
                3/29/2012
             | 
            
                -0.30 / -3.23%
             |             
            
                9.40
             |           
            
                9.40
             |               
            
                8.90
             |                           
            
                9.00
             | 
            
                9.17
             |                     
            
                3.98
             |                                 
            
                106,200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/28/2012
             | 
            
                -0.10 / -1.06%
             |             
            
                8.80
             |           
            
                9.40
             |               
            
                8.80
             |                           
            
                9.30
             | 
            
                9.19
             |                     
            
                4.12
             |                                 
            
                76,500
             |            
            
                 
             |                                       
         
    
        
            | 
                3/27/2012
             | 
            
                -0.20 / -2.08%
             |             
            
                10.10
             |           
            
                10.20
             |               
            
                9.20
             |                           
            
                9.40
             | 
            
                9.82
             |                     
            
                4.16
             |                                 
            
                135,666
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/26/2012
             | 
            
                +0.50 / +5.49%
             |             
            
                9.30
             |           
            
                9.60
             |               
            
                9.30
             |                           
            
                9.60
             | 
            
                9.54
             |                     
            
                4.25
             |                                 
            
                341,799
             |            
            
                 
             |                                       
         
    
        
            | 
                3/23/2012
             | 
            
                +0.50 / +5.81%
             |             
            
                8.70
             |           
            
                9.20
             |               
            
                8.70
             |                           
            
                9.10
             | 
            
                9.04
             |                     
            
                4.03
             |                                 
            
                228,200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/22/2012
             | 
            
                0.00 / 0.00%
             |             
            
                8.50
             |           
            
                8.70
             |               
            
                8.50
             |                           
            
                8.60
             | 
            
                8.57
             |                     
            
                3.81
             |                                 
            
                50,200
             |            
            
                 
             |                                       
         
    
        
            | 
                3/21/2012
             | 
            
                +0.20 / +2.38%
             |             
            
                8.20
             |           
            
                8.80
             |               
            
                8.20
             |                           
            
                8.60
             | 
            
                8.58
             |                     
            
                3.81
             |                                 
            
                98,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/20/2012
             | 
            
                +0.10 / +1.20%
             |             
            
                8.20
             |           
            
                8.50
             |               
            
                8.20
             |                           
            
                8.40
             | 
            
                8.31
             |                     
            
                3.72
             |                                 
            
                77,800
             |            
            
                 
             |                                       
         
    
        
            | 
                3/19/2012
             | 
            
                -0.20 / -2.35%
             |             
            
                8.30
             |           
            
                8.50
             |               
            
                8.10
             |                           
            
                8.30
             | 
            
                8.36
             |                     
            
                3.67
             |                                 
            
                27,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/16/2012
             | 
            
                +0.10 / +1.19%
             |             
            
                8.60
             |           
            
                8.60
             |               
            
                8.40
             |                           
            
                8.50
             | 
            
                8.51
             |                     
            
                3.76
             |                                 
            
                48,200
             |            
            
                 
             |                                       
         
    
        
            | 
                3/15/2012
             | 
            
                +0.50 / +6.33%
             |             
            
                7.80
             |           
            
                8.40
             |               
            
                7.80
             |                           
            
                8.40
             | 
            
                8.10
             |                     
            
                3.72
             |                                 
            
                58,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/14/2012
             | 
            
                -0.20 / -2.47%
             |             
            
                8.20
             |           
            
                8.20
             |               
            
                7.90
             |                           
            
                7.90
             | 
            
                7.98
             |                     
            
                3.50
             |                                 
            
                42,300
             |            
            
                 
             |                                       
         
    
        
            | 
                3/13/2012
             | 
            
                +0.20 / +2.53%
             |             
            
                7.90
             |           
            
                8.20
             |               
            
                7.90
             |                           
            
                8.10
             | 
            
                8.05
             |                     
            
                3.59
             |                                 
            
                39,500
             |  
            
                 
             |                                                              
             
    
         
    
    
 |