| 
                 
                    Closing price on 5/6/2013
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    9.00 | 
                 
                
                    | High | 
                    9.20 | 
                 
                
                    | Low | 
                    9.00 | 
                     
                
                    | Volume | 
                    54,860 | 
                                 
                
                    | Split-adjusted Price | 
                    4.87 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
SD6 Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                5/6/2013
             | 
            
                0.00 / 0.00%
             |             
            
                9.00
             |           
            
                9.20
             |               
            
                9.00
             |                           
            
                9.10
             | 
            
                9.11
             |                     
            
                4.87
             |                                 
            
                54,860
             |            
            
                 
             |                                       
         
    
        
            | 
                5/3/2013
             | 
            
                +0.20 / +2.25%
             |             
            
                8.90
             |           
            
                9.10
             |               
            
                8.90
             |                           
            
                9.10
             | 
            
                9.00
             |                     
            
                4.87
             |                                 
            
                54,320
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/2/2013
             | 
            
                0.00 / 0.00%
             |             
            
                8.80
             |           
            
                8.90
             |               
            
                8.80
             |                           
            
                8.90
             | 
            
                8.89
             |                     
            
                4.76
             |                                 
            
                9,000
             |            
            
                 
             |                                       
         
    
        
            | 
                4/26/2013
             | 
            
                +0.10 / +1.14%
             |             
            
                8.80
             |           
            
                8.90
             |               
            
                8.80
             |                           
            
                8.90
             | 
            
                8.86
             |                     
            
                4.76
             |                                 
            
                46,700
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/25/2013
             | 
            
                0.00 / 0.00%
             |             
            
                8.70
             |           
            
                8.90
             |               
            
                8.70
             |                           
            
                8.80
             | 
            
                8.83
             |                     
            
                4.71
             |                                 
            
                40,400
             |            
            
                 
             |                                       
         
    
        
            | 
                4/24/2013
             | 
            
                0.00 / 0.00%
             |             
            
                8.80
             |           
            
                8.90
             |               
            
                8.80
             |                           
            
                8.80
             | 
            
                8.80
             |                     
            
                4.71
             |                                 
            
                25,600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/23/2013
             | 
            
                0.00 / 0.00%
             |             
            
                8.90
             |           
            
                8.90
             |               
            
                8.80
             |                           
            
                8.80
             | 
            
                8.82
             |                     
            
                4.71
             |                                 
            
                68,700
             |            
            
                 
             |                                       
         
    
        
            | 
                4/22/2013
             | 
            
                -0.20 / -2.22%
             |             
            
                9.30
             |           
            
                9.30
             |               
            
                8.80
             |                           
            
                8.80
             | 
            
                8.85
             |                     
            
                4.71
             |                                 
            
                36,700
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/18/2013
             | 
            
                -0.10 / -1.10%
             |             
            
                9.00
             |           
            
                9.10
             |               
            
                8.90
             |                           
            
                9.00
             | 
            
                9.02
             |                     
            
                4.82
             |                                 
            
                45,400
             |            
            
                 
             |                                       
         
    
        
            | 
                4/17/2013
             | 
            
                +0.30 / +3.41%
             |             
            
                8.90
             |           
            
                9.50
             |               
            
                8.90
             |                           
            
                9.10
             | 
            
                9.19
             |                     
            
                4.87
             |                                 
            
                204,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/16/2013
             | 
            
                0.00 / 0.00%
             |             
            
                8.70
             |           
            
                8.80
             |               
            
                8.60
             |                           
            
                8.80
             | 
            
                8.66
             |                     
            
                4.71
             |                                 
            
                58,200
             |            
            
                 
             |                                       
         
    
        
            | 
                4/15/2013
             | 
            
                -0.10 / -1.12%
             |             
            
                8.90
             |           
            
                8.90
             |               
            
                8.70
             |                           
            
                8.80
             | 
            
                8.81
             |                     
            
                4.71
             |                                 
            
                52,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/12/2013
             | 
            
                0.00 / 0.00%
             |             
            
                8.90
             |           
            
                8.90
             |               
            
                8.80
             |                           
            
                8.90
             | 
            
                8.84
             |                     
            
                4.76
             |                                 
            
                82,356
             |            
            
                 
             |                                       
         
    
        
            | 
                4/11/2013
             | 
            
                +0.10 / +1.14%
             |             
            
                8.90
             |           
            
                9.00
             |               
            
                8.80
             |                           
            
                8.90
             | 
            
                8.90
             |                     
            
                4.76
             |                                 
            
                82,700
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/10/2013
             | 
            
                -0.30 / -3.30%
             |             
            
                9.00
             |           
            
                9.00
             |               
            
                8.70
             |                           
            
                8.80
             | 
            
                8.88
             |                     
            
                4.71
             |                                 
            
                145,166
             |            
            
                 
             |                                       
         
    
        
            | 
                4/9/2013
             | 
            
                0.00 / 0.00%
             |             
            
                9.10
             |           
            
                9.20
             |               
            
                9.00
             |                           
            
                9.10
             | 
            
                9.10
             |                     
            
                4.87
             |                                 
            
                53,790
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/8/2013
             | 
            
                +0.40 / +4.60%
             |             
            
                8.90
             |           
            
                9.20
             |               
            
                8.90
             |                           
            
                9.10
             | 
            
                9.06
             |                     
            
                4.87
             |                                 
            
                235,500
             |            
            
                 
             |                                       
         
    
        
            | 
                4/5/2013
             | 
            
                -0.10 / -1.14%
             |             
            
                9.00
             |           
            
                9.00
             |               
            
                8.70
             |                           
            
                8.70
             | 
            
                8.79
             |                     
            
                4.66
             |                                 
            
                104,600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/4/2013
             | 
            
                -0.10 / -1.12%
             |             
            
                8.80
             |           
            
                9.00
             |               
            
                8.70
             |                           
            
                8.80
             | 
            
                8.86
             |                     
            
                4.71
             |                                 
            
                73,000
             |            
            
                 
             |                                       
         
    
        
            | 
                4/3/2013
             | 
            
                +0.10 / +1.14%
             |             
            
                9.00
             |           
            
                9.00
             |               
            
                8.70
             |                           
            
                8.90
             | 
            
                8.82
             |                     
            
                4.76
             |                                 
            
                74,010
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/2/2013
             | 
            
                -0.40 / -4.35%
             |             
            
                9.00
             |           
            
                9.20
             |               
            
                8.80
             |                           
            
                8.80
             | 
            
                8.98
             |                     
            
                4.71
             |                                 
            
                229,600
             |            
            
                 
             |                                       
         
    
        
            | 
                4/1/2013
             | 
            
                0.00 / 0.00%
             |             
            
                9.10
             |           
            
                9.30
             |               
            
                9.00
             |                           
            
                9.20
             | 
            
                9.16
             |                     
            
                4.92
             |                                 
            
                116,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/29/2013
             | 
            
                +0.30 / +3.37%
             |             
            
                8.60
             |           
            
                9.20
             |               
            
                8.50
             |                           
            
                9.20
             | 
            
                8.96
             |                     
            
                4.92
             |                                 
            
                220,400
             |            
            
                 
             |                                       
         
    
        
            | 
                3/28/2013
             | 
            
                -0.20 / -2.20%
             |             
            
                9.00
             |           
            
                9.00
             |               
            
                8.70
             |                           
            
                8.90
             | 
            
                8.88
             |                     
            
                4.76
             |                                 
            
                75,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/27/2013
             | 
            
                0.00 / 0.00%
             |             
            
                8.90
             |           
            
                9.10
             |               
            
                8.90
             |                           
            
                9.10
             | 
            
                8.98
             |                     
            
                4.87
             |                                 
            
                52,600
             |            
            
                 
             |                                       
         
    
        
            | 
                3/26/2013
             | 
            
                +0.20 / +2.25%
             |             
            
                9.00
             |           
            
                9.30
             |               
            
                9.00
             |                           
            
                9.10
             | 
            
                9.06
             |                     
            
                4.87
             |                                 
            
                181,040
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/25/2013
             | 
            
                +0.40 / +4.71%
             |             
            
                8.50
             |           
            
                9.00
             |               
            
                8.50
             |                           
            
                8.90
             | 
            
                8.68
             |                     
            
                4.76
             |                                 
            
                231,200
             |            
            
                 
             |                                       
         
    
        
            | 
                3/22/2013
             | 
            
                -0.10 / -1.16%
             |             
            
                8.50
             |           
            
                8.50
             |               
            
                8.30
             |                           
            
                8.50
             | 
            
                8.47
             |                     
            
                4.55
             |                                 
            
                50,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/21/2013
             | 
            
                +0.10 / +1.18%
             |             
            
                8.60
             |           
            
                8.60
             |               
            
                8.40
             |                           
            
                8.60
             | 
            
                8.53
             |                     
            
                4.60
             |                                 
            
                59,500
             |            
            
                 
             |                                       
         
    
        
            | 
                3/20/2013
             | 
            
                -0.10 / -1.16%
             |             
            
                8.50
             |           
            
                8.60
             |               
            
                8.50
             |                           
            
                8.50
             | 
            
                8.51
             |                     
            
                4.55
             |                                 
            
                59,700
             |  
            
                 
             |                                                              
             
    
         
    
    
 |