| 
                 
                    Closing price on 9/7/2010
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    81.50 | 
                 
                
                    | High | 
                    83.50 | 
                 
                
                    | Low | 
                    81.50 | 
                     
                
                    | Volume | 
                    7,520 | 
                                 
                
                    | Split-adjusted Price | 
                    26.18 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
NBB Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                9/7/2010
             | 
            
                +1.50 / +1.85%
             |             
            
                81.50
             |           
            
                83.50
             |               
            
                81.50
             |                           
            
                82.50
             | 
            
                82.50
             |                     
            
                26.18
             |                                 
            
                7,520
             |            
            
                 
             |                                       
         
    
        
            | 
                9/6/2010
             | 
            
                -2.00 / -2.41%
             |             
            
                85.00
             |           
            
                85.00
             |               
            
                81.00
             |                           
            
                81.00
             | 
            
                81.00
             |                     
            
                25.70
             |                                 
            
                12,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/1/2010
             | 
            
                -0.50 / -0.60%
             |             
            
                83.00
             |           
            
                83.00
             |               
            
                82.00
             |                           
            
                83.00
             | 
            
                83.00
             |                     
            
                26.34
             |                                 
            
                16,650
             |            
            
                 
             |                                       
         
    
        
            | 
                8/31/2010
             | 
            
                +2.50 / +3.09%
             |             
            
                83.50
             |           
            
                84.00
             |               
            
                83.00
             |                           
            
                83.50
             | 
            
                83.50
             |                     
            
                26.50
             |                                 
            
                23,970
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/30/2010
             | 
            
                0.00 / 0.00%
             |             
            
                84.00
             |           
            
                84.00
             |               
            
                78.50
             |                           
            
                81.00
             | 
            
                81.00
             |                     
            
                25.70
             |                                 
            
                33,510
             |            
            
                 
             |                                       
         
    
        
            | 
                8/27/2010
             | 
            
                +1.00 / +1.25%
             |             
            
                77.00
             |           
            
                82.00
             |               
            
                77.00
             |                           
            
                81.00
             | 
            
                81.00
             |                     
            
                25.70
             |                                 
            
                24,820
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/26/2010
             | 
            
                0.00 / 0.00%
             |             
            
                83.00
             |           
            
                83.00
             |               
            
                80.00
             |                           
            
                80.00
             | 
            
                80.00
             |                     
            
                25.39
             |                                 
            
                32,280
             |            
            
                 
             |                                       
         
    
        
            | 
                8/25/2010
             | 
            
                -3.00 / -3.61%
             |             
            
                83.00
             |           
            
                83.00
             |               
            
                80.00
             |                           
            
                80.00
             | 
            
                80.00
             |                     
            
                25.39
             |                                 
            
                33,920
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/24/2010
             | 
            
                -3.00 / -3.49%
             |             
            
                86.00
             |           
            
                86.00
             |               
            
                83.00
             |                           
            
                83.00
             | 
            
                83.00
             |                     
            
                26.34
             |                                 
            
                8,860
             |            
            
                 
             |                                       
         
    
        
            | 
                8/23/2010
             | 
            
                -1.00 / -1.15%
             |             
            
                90.00
             |           
            
                90.00
             |               
            
                83.00
             |                           
            
                86.00
             | 
            
                86.00
             |                     
            
                27.29
             |                                 
            
                9,330
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/20/2010
             | 
            
                +2.00 / +2.35%
             |             
            
                85.00
             |           
            
                87.00
             |               
            
                85.00
             |                           
            
                87.00
             | 
            
                87.00
             |                     
            
                27.61
             |                                 
            
                5,600
             |            
            
                 
             |                                       
         
    
        
            | 
                8/19/2010
             | 
            
                -1.50 / -1.73%
             |             
            
                83.50
             |           
            
                85.00
             |               
            
                83.50
             |                           
            
                85.00
             | 
            
                85.00
             |                     
            
                26.97
             |                                 
            
                9,410
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/18/2010
             | 
            
                +0.50 / +0.58%
             |             
            
                82.50
             |           
            
                86.50
             |               
            
                82.50
             |                           
            
                86.50
             | 
            
                86.50
             |                     
            
                27.45
             |                                 
            
                1,300
             |            
            
                 
             |                                       
         
    
        
            | 
                8/17/2010
             | 
            
                -1.00 / -1.15%
             |             
            
                85.00
             |           
            
                86.00
             |               
            
                84.00
             |                           
            
                86.00
             | 
            
                86.00
             |                     
            
                27.29
             |                                 
            
                14,710
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/16/2010
             | 
            
                +0.50 / +0.58%
             |             
            
                88.00
             |           
            
                88.00
             |               
            
                85.00
             |                           
            
                87.00
             | 
            
                87.00
             |                     
            
                27.61
             |                                 
            
                6,950
             |            
            
                 
             |                                       
         
    
        
            | 
                8/13/2010
             | 
            
                +3.50 / +4.22%
             |             
            
                84.50
             |           
            
                86.50
             |               
            
                84.50
             |                           
            
                86.50
             | 
            
                86.50
             |                     
            
                27.45
             |                                 
            
                13,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/12/2010
             | 
            
                -4.00 / -4.60%
             |             
            
                85.00
             |           
            
                86.50
             |               
            
                83.00
             |                           
            
                83.00
             | 
            
                83.00
             |                     
            
                26.34
             |                                 
            
                33,950
             |            
            
                 
             |                                       
         
    
        
            | 
                8/11/2010
             | 
            
                +1.00 / +1.16%
             |             
            
                90.00
             |           
            
                90.00
             |               
            
                87.00
             |                           
            
                87.00
             | 
            
                87.00
             |                     
            
                27.61
             |                                 
            
                1,010
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/10/2010
             | 
            
                -3.50 / -3.91%
             |             
            
                87.00
             |           
            
                89.00
             |               
            
                86.00
             |                           
            
                86.00
             | 
            
                86.00
             |                     
            
                27.29
             |                                 
            
                33,890
             |            
            
                 
             |                                       
         
    
        
            | 
                8/9/2010
             | 
            
                -1.00 / -1.10%
             |             
            
                88.00
             |           
            
                90.50
             |               
            
                87.50
             |                           
            
                89.50
             | 
            
                89.50
             |                     
            
                28.40
             |                                 
            
                12,520
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/6/2010
             | 
            
                -1.00 / -1.09%
             |             
            
                89.50
             |           
            
                90.50
             |               
            
                89.50
             |                           
            
                90.50
             | 
            
                90.50
             |                     
            
                28.72
             |                                 
            
                56,600
             |            
            
                 
             |                                       
         
    
        
            | 
                8/5/2010
             | 
            
                0.00 / 0.00%
             |             
            
                91.50
             |           
            
                91.50
             |               
            
                91.00
             |                           
            
                91.50
             | 
            
                91.50
             |                     
            
                29.03
             |                                 
            
                16,650
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/4/2010
             | 
            
                0.00 / 0.00%
             |             
            
                91.50
             |           
            
                92.50
             |               
            
                91.50
             |                           
            
                91.50
             | 
            
                91.50
             |                     
            
                29.03
             |                                 
            
                13,710
             |            
            
                 
             |                                       
         
    
        
            | 
                8/3/2010
             | 
            
                -0.50 / -0.54%
             |             
            
                92.00
             |           
            
                92.00
             |               
            
                91.00
             |                           
            
                91.50
             | 
            
                91.50
             |                     
            
                29.03
             |                                 
            
                62,010
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/2/2010
             | 
            
                0.00 / 0.00%
             |             
            
                92.00
             |           
            
                92.00
             |               
            
                88.50
             |                           
            
                92.00
             | 
            
                92.00
             |                     
            
                29.19
             |                                 
            
                30,000
             |            
            
                 
             |                                       
         
    
        
            | 
                7/30/2010
             | 
            
                0.00 / 0.00%
             |             
            
                92.00
             |           
            
                92.00
             |               
            
                92.00
             |                           
            
                92.00
             | 
            
                92.00
             |                     
            
                29.19
             |                                 
            
                2,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/29/2010
             | 
            
                0.00 / 0.00%
             |             
            
                92.00
             |           
            
                92.00
             |               
            
                90.00
             |                           
            
                92.00
             | 
            
                92.00
             |                     
            
                29.19
             |                                 
            
                19,210
             |            
            
                 
             |                                       
         
    
        
            | 
                7/28/2010
             | 
            
                0.00 / 0.00%
             |             
            
                92.00
             |           
            
                92.00
             |               
            
                91.00
             |                           
            
                92.00
             | 
            
                92.00
             |                     
            
                29.19
             |                                 
            
                30,110
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/27/2010
             | 
            
                -0.50 / -0.54%
             |             
            
                92.50
             |           
            
                93.00
             |               
            
                92.00
             |                           
            
                92.00
             | 
            
                92.00
             |                     
            
                29.19
             |                                 
            
                40,910
             |            
            
                 
             |                                       
         
    
        
            | 
                7/26/2010
             | 
            
                +0.50 / +0.54%
             |             
            
                93.00
             |           
            
                93.50
             |               
            
                92.00
             |                           
            
                92.50
             | 
            
                92.50
             |                     
            
                29.35
             |                                 
            
                54,000
             |  
            
                 
             |                                                              
             
    
         
    
    
 |