| 
                 
                    Closing price on 4/7/2011
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    18.00 | 
                 
                
                    | High | 
                    18.00 | 
                 
                
                    | Low | 
                    17.70 | 
                     
                
                    | Volume | 
                    71,900 | 
                                 
                
                    | Split-adjusted Price | 
                    2.08 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
DBC Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                4/7/2011
             | 
            
                -0.50 / -2.75%
             |             
            
                18.00
             |           
            
                18.00
             |               
            
                17.70
             |                           
            
                17.70
             | 
            
                17.82
             |                     
            
                2.08
             |                                 
            
                71,900
             |            
            
                 
             |                                       
         
    
        
            | 
                4/6/2011
             | 
            
                +0.70 / +4.00%
             |             
            
                17.50
             |           
            
                18.30
             |               
            
                17.50
             |                           
            
                18.20
             | 
            
                18.05
             |                     
            
                2.13
             |                                 
            
                138,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/5/2011
             | 
            
                +0.10 / +0.57%
             |             
            
                17.40
             |           
            
                17.60
             |               
            
                17.30
             |                           
            
                17.50
             | 
            
                17.40
             |                     
            
                2.05
             |                                 
            
                49,400
             |            
            
                 
             |                                       
         
    
        
            | 
                4/4/2011
             | 
            
                +0.10 / +0.58%
             |             
            
                17.40
             |           
            
                17.50
             |               
            
                17.20
             |                           
            
                17.40
             | 
            
                17.36
             |                     
            
                2.04
             |                                 
            
                56,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/1/2011
             | 
            
                -0.10 / -0.57%
             |             
            
                17.30
             |           
            
                17.50
             |               
            
                17.30
             |                           
            
                17.30
             | 
            
                17.34
             |                     
            
                2.03
             |                                 
            
                73,100
             |            
            
                 
             |                                       
         
    
        
            | 
                3/31/2011
             | 
            
                0.00 / 0.00%
             |             
            
                17.50
             |           
            
                17.50
             |               
            
                17.20
             |                           
            
                17.40
             | 
            
                17.32
             |                     
            
                2.04
             |                                 
            
                52,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/30/2011
             | 
            
                -0.10 / -0.57%
             |             
            
                17.50
             |           
            
                17.50
             |               
            
                17.10
             |                           
            
                17.40
             | 
            
                17.27
             |                     
            
                2.04
             |                                 
            
                96,900
             |            
            
                 
             |                                       
         
    
        
            | 
                3/29/2011
             | 
            
                -0.40 / -2.23%
             |             
            
                17.90
             |           
            
                17.90
             |               
            
                17.50
             |                           
            
                17.50
             | 
            
                17.57
             |                     
            
                2.05
             |                                 
            
                108,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/28/2011
             | 
            
                +0.20 / +1.13%
             |             
            
                18.10
             |           
            
                18.10
             |               
            
                17.80
             |                           
            
                17.90
             | 
            
                17.87
             |                     
            
                2.10
             |                                 
            
                40,100
             |            
            
                 
             |                                       
         
    
        
            | 
                3/25/2011
             | 
            
                -0.40 / -2.21%
             |             
            
                18.10
             |           
            
                18.10
             |               
            
                17.70
             |                           
            
                17.70
             | 
            
                17.80
             |                     
            
                2.08
             |                                 
            
                105,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/24/2011
             | 
            
                -0.20 / -1.09%
             |             
            
                18.80
             |           
            
                18.90
             |               
            
                17.90
             |                           
            
                18.10
             | 
            
                18.11
             |                     
            
                2.12
             |                                 
            
                108,700
             |            
            
                 
             |                                       
         
    
        
            | 
                3/23/2011
             | 
            
                +0.40 / +2.23%
             |             
            
                18.90
             |           
            
                19.00
             |               
            
                17.90
             |                           
            
                18.30
             | 
            
                18.14
             |                     
            
                2.15
             |                                 
            
                89,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/22/2011
             | 
            
                -0.60 / -3.24%
             |             
            
                18.50
             |           
            
                18.60
             |               
            
                17.80
             |                           
            
                17.90
             | 
            
                18.16
             |                     
            
                2.10
             |                                 
            
                118,200
             |            
            
                 
             |                                       
         
    
        
            | 
                3/21/2011
             | 
            
                -0.20 / -1.07%
             |             
            
                19.10
             |           
            
                19.50
             |               
            
                18.30
             |                           
            
                18.50
             | 
            
                18.66
             |                     
            
                2.17
             |                                 
            
                93,200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/18/2011
             | 
            
                +0.50 / +2.75%
             |             
            
                18.30
             |           
            
                18.70
             |               
            
                18.00
             |                           
            
                18.70
             | 
            
                18.36
             |                     
            
                2.19
             |                                 
            
                163,600
             |            
            
                 
             |                                       
         
    
        
            | 
                3/17/2011
             | 
            
                +0.20 / +1.11%
             |             
            
                18.40
             |           
            
                18.40
             |               
            
                17.90
             |                           
            
                18.20
             | 
            
                18.10
             |                     
            
                2.13
             |                                 
            
                95,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/16/2011
             | 
            
                +0.10 / +0.56%
             |             
            
                18.00
             |           
            
                18.30
             |               
            
                17.50
             |                           
            
                18.00
             | 
            
                17.99
             |                     
            
                2.11
             |                                 
            
                82,200
             |            
            
                 
             |                                       
         
    
        
            | 
                3/15/2011
             | 
            
                0.00 / 0.00%
             |             
            
                17.50
             |           
            
                18.30
             |               
            
                17.50
             |                           
            
                17.90
             | 
            
                17.97
             |                     
            
                2.10
             |                                 
            
                112,600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/14/2011
             | 
            
                -1.20 / -6.28%
             |             
            
                19.50
             |           
            
                20.00
             |               
            
                17.80
             |                           
            
                17.90
             | 
            
                18.20
             |                     
            
                2.10
             |                                 
            
                236,600
             |            
            
                 
             |                                       
         
    
        
            | 
                3/11/2011
             | 
            
                +1.10 / +6.11%
             |             
            
                18.50
             |           
            
                19.10
             |               
            
                18.50
             |                           
            
                19.10
             | 
            
                19.09
             |                     
            
                2.24
             |                                 
            
                206,600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/10/2011
             | 
            
                +1.30 / +7.78%
             |             
            
                16.30
             |           
            
                18.00
             |               
            
                16.30
             |                           
            
                18.00
             | 
            
                17.91
             |                     
            
                2.11
             |                                 
            
                182,500
             |            
            
                 
             |                                       
         
    
        
            | 
                3/9/2011
             | 
            
                -0.80 / -4.57%
             |             
            
                17.30
             |           
            
                17.30
             |               
            
                16.60
             |                           
            
                16.70
             | 
            
                16.91
             |                     
            
                1.96
             |                                 
            
                127,600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/8/2011
             | 
            
                -0.30 / -1.69%
             |             
            
                17.70
             |           
            
                18.00
             |               
            
                17.40
             |                           
            
                17.50
             | 
            
                17.67
             |                     
            
                2.05
             |                                 
            
                103,000
             |            
            
                 
             |                                       
         
    
        
            | 
                3/7/2011
             | 
            
                +0.10 / +0.56%
             |             
            
                16.30
             |           
            
                17.80
             |               
            
                16.30
             |                           
            
                17.80
             | 
            
                17.57
             |                     
            
                2.09
             |                                 
            
                108,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/4/2011
             | 
            
                +0.60 / +3.51%
             |             
            
                16.30
             |           
            
                17.80
             |               
            
                16.30
             |                           
            
                17.70
             | 
            
                17.47
             |                     
            
                2.08
             |                                 
            
                95,000
             |            
            
                 
             |                                       
         
    
        
            | 
                3/3/2011
             | 
            
                -0.40 / -2.29%
             |             
            
                17.50
             |           
            
                18.00
             |               
            
                17.10
             |                           
            
                17.10
             | 
            
                17.46
             |                     
            
                2.01
             |                                 
            
                148,700
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/2/2011
             | 
            
                -1.10 / -5.91%
             |             
            
                18.60
             |           
            
                18.60
             |               
            
                17.30
             |                           
            
                17.50
             | 
            
                17.55
             |                     
            
                2.05
             |                                 
            
                175,900
             |            
            
                 
             |                                       
         
    
        
            | 
                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
             |  
            
                 
             |                                                              
             
    
         
    
    
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