| 
                 
                    Closing price on 3/1/2011
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    19.00 | 
                 
                
                    | High | 
                    19.00 | 
                 
                
                    | Low | 
                    18.40 | 
                     
                
                    | Volume | 
                    70,000 | 
                                 
                
                    | Split-adjusted Price | 
                    2.18 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
DBC Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                3/1/2011
             | 
            
                -0.10 / -0.53%
             |             
            
                19.00
             |           
            
                19.00
             |               
            
                18.40
             |                           
            
                18.60
             | 
            
                18.56
             |                     
            
                2.18
             |                                 
            
                70,000
             |            
            
                 
             |                                       
         
    
        
            | 
                2/28/2011
             | 
            
                -0.50 / -2.60%
             |             
            
                19.00
             |           
            
                19.60
             |               
            
                18.60
             |                           
            
                18.70
             | 
            
                19.04
             |                     
            
                2.19
             |                                 
            
                119,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/25/2011
             | 
            
                +0.70 / +3.78%
             |             
            
                18.00
             |           
            
                19.30
             |               
            
                18.00
             |                           
            
                19.20
             | 
            
                18.81
             |                     
            
                2.25
             |                                 
            
                168,300
             |            
            
                 
             |                                       
         
    
        
            | 
                2/24/2011
             | 
            
                -0.70 / -3.65%
             |             
            
                17.50
             |           
            
                19.10
             |               
            
                17.50
             |                           
            
                18.50
             | 
            
                18.10
             |                     
            
                2.17
             |                                 
            
                182,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/23/2011
             | 
            
                +0.70 / +3.78%
             |             
            
                19.00
             |           
            
                19.20
             |               
            
                18.40
             |                           
            
                19.20
             | 
            
                18.79
             |                     
            
                2.25
             |                                 
            
                256,300
             |            
            
                 
             |                                       
         
    
        
            | 
                2/22/2011
             | 
            
                -0.90 / -4.64%
             |             
            
                19.00
             |           
            
                19.00
             |               
            
                18.20
             |                           
            
                18.50
             | 
            
                18.33
             |                     
            
                2.17
             |                                 
            
                494,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/21/2011
             | 
            
                -1.30 / -6.28%
             |             
            
                21.20
             |           
            
                21.20
             |               
            
                19.40
             |                           
            
                19.40
             | 
            
                19.49
             |                     
            
                2.28
             |                                 
            
                166,900
             |            
            
                 
             |                                       
         
    
        
            | 
                2/18/2011
             | 
            
                -1.10 / -5.05%
             |             
            
                21.20
             |           
            
                21.60
             |               
            
                20.00
             |                           
            
                20.70
             | 
            
                20.80
             |                     
            
                2.43
             |                                 
            
                153,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/17/2011
             | 
            
                +0.30 / +1.40%
             |             
            
                22.30
             |           
            
                22.50
             |               
            
                21.20
             |                           
            
                21.80
             | 
            
                21.54
             |                     
            
                2.56
             |                                 
            
                159,500
             |            
            
                 
             |                                       
         
    
        
            | 
                2/16/2011
             | 
            
                -0.90 / -4.02%
             |             
            
                22.80
             |           
            
                22.80
             |               
            
                21.50
             |                           
            
                21.50
             | 
            
                22.12
             |                     
            
                2.52
             |                                 
            
                170,600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/15/2011
             | 
            
                -0.30 / -1.32%
             |             
            
                22.60
             |           
            
                22.70
             |               
            
                22.40
             |                           
            
                22.40
             | 
            
                22.52
             |                     
            
                2.63
             |                                 
            
                106,400
             |            
            
                 
             |                                       
         
    
        
            | 
                2/14/2011
             | 
            
                -0.10 / -0.44%
             |             
            
                22.60
             |           
            
                23.00
             |               
            
                22.60
             |                           
            
                22.70
             | 
            
                22.74
             |                     
            
                2.66
             |                                 
            
                127,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/11/2011
             | 
            
                0.00 / 0.00%
             |             
            
                22.90
             |           
            
                22.90
             |               
            
                22.40
             |                           
            
                22.80
             | 
            
                22.63
             |                     
            
                2.67
             |                                 
            
                107,600
             |            
            
                 
             |                                       
         
    
        
            | 
                2/10/2011
             | 
            
                -0.10 / -0.44%
             |             
            
                22.80
             |           
            
                23.00
             |               
            
                22.50
             |                           
            
                22.80
             | 
            
                22.74
             |                     
            
                2.67
             |                                 
            
                68,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/9/2011
             | 
            
                -0.30 / -1.29%
             |             
            
                23.50
             |           
            
                23.70
             |               
            
                22.80
             |                           
            
                22.90
             | 
            
                23.31
             |                     
            
                2.69
             |                                 
            
                68,300
             |            
            
                 
             |                                       
         
    
        
            | 
                2/8/2011
             | 
            
                -0.40 / -1.69%
             |             
            
                24.20
             |           
            
                24.20
             |               
            
                23.00
             |                           
            
                23.20
             | 
            
                23.32
             |                     
            
                2.72
             |                                 
            
                56,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/28/2011
             | 
            
                -0.50 / -2.07%
             |             
            
                24.50
             |           
            
                24.60
             |               
            
                23.50
             |                           
            
                23.60
             | 
            
                23.86
             |                     
            
                2.77
             |                                 
            
                247,400
             |            
            
                 
             |                                       
         
    
        
            | 
                1/27/2011
             | 
            
                +1.20 / +5.24%
             |             
            
                22.90
             |           
            
                24.10
             |               
            
                22.90
             |                           
            
                24.10
             | 
            
                23.60
             |                     
            
                2.83
             |                                 
            
                378,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/26/2011
             | 
            
                +1.10 / +5.05%
             |             
            
                21.90
             |           
            
                23.00
             |               
            
                21.90
             |                           
            
                22.90
             | 
            
                22.64
             |                     
            
                2.69
             |                                 
            
                82,700
             |            
            
                 
             |                                       
         
    
        
            | 
                1/25/2011
             | 
            
                -0.20 / -0.91%
             |             
            
                22.10
             |           
            
                22.10
             |               
            
                21.70
             |                           
            
                21.80
             | 
            
                21.86
             |                     
            
                2.56
             |                                 
            
                252,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/24/2011
             | 
            
                -0.40 / -1.79%
             |             
            
                22.60
             |           
            
                22.60
             |               
            
                21.80
             |                           
            
                22.00
             | 
            
                22.13
             |                     
            
                2.58
             |                                 
            
                163,000
             |            
            
                 
             |                                       
         
    
        
            | 
                1/21/2011
             | 
            
                -0.40 / -1.75%
             |             
            
                22.90
             |           
            
                23.40
             |               
            
                22.30
             |                           
            
                22.40
             | 
            
                22.60
             |                     
            
                2.63
             |                                 
            
                207,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/20/2011
             | 
            
                -0.10 / -0.44%
             |             
            
                22.80
             |           
            
                23.20
             |               
            
                22.70
             |                           
            
                22.80
             | 
            
                22.95
             |                     
            
                2.67
             |                                 
            
                104,800
             |            
            
                 
             |                                       
         
    
        
            | 
                1/19/2011
             | 
            
                0.00 / 0.00%
             |             
            
                23.20
             |           
            
                23.90
             |               
            
                22.50
             |                           
            
                22.90
             | 
            
                22.99
             |                     
            
                2.69
             |                                 
            
                116,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/18/2011
             | 
            
                -0.30 / -1.29%
             |             
            
                23.40
             |           
            
                24.20
             |               
            
                22.50
             |                           
            
                22.90
             | 
            
                23.29
             |                     
            
                2.69
             |                                 
            
                268,100
             |            
            
                 
             |                                       
         
    
        
            | 
                1/17/2011
             | 
            
                0.00 / 0.00%
             |             
            
                23.20
             |           
            
                24.00
             |               
            
                23.00
             |                           
            
                23.20
             | 
            
                23.43
             |                     
            
                2.72
             |                                 
            
                116,600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/14/2011
             | 
            
                +0.60 / +2.65%
             |             
            
                22.80
             |           
            
                23.20
             |               
            
                22.60
             |                           
            
                23.20
             | 
            
                22.85
             |                     
            
                2.72
             |                                 
            
                124,500
             |            
            
                 
             |                                       
         
    
        
            | 
                1/13/2011
             | 
            
                -1.60 / -6.61%
             |             
            
                22.50
             |           
            
                23.20
             |               
            
                22.40
             |                           
            
                22.60
             | 
            
                22.74
             |                     
            
                2.65
             |                                 
            
                68,700
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/12/2011
             | 
            
                +0.70 / +2.98%
             |             
            
                24.00
             |           
            
                24.70
             |               
            
                23.70
             |                           
            
                24.20
             | 
            
                24.01
             |                     
            
                2.66
             |                                 
            
                137,400
             |            
            
                 
             |                                       
         
    
        
            | 
                1/11/2011
             | 
            
                -0.20 / -0.84%
             |             
            
                23.60
             |           
            
                23.80
             |               
            
                23.00
             |                           
            
                23.50
             | 
            
                23.40
             |                     
            
                2.58
             |                                 
            
                195,100
             |  
            
                 
             |                                                              
             
    
         
    
    
 |