| 
                 
                    Closing price on 12/14/2010
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    78.00 | 
                 
                
                    | High | 
                    82.00 | 
                 
                
                    | Low | 
                    78.00 | 
                     
                
                    | Volume | 
                    27,300 | 
                                 
                
                    | Split-adjusted Price | 
                    26.02 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
NBB Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                12/14/2010
             | 
            
                +1.00 / +1.23%
             |             
            
                78.00
             |           
            
                82.00
             |               
            
                78.00
             |                           
            
                82.00
             | 
            
                82.00
             |                     
            
                26.02
             |                                 
            
                27,300
             |            
            
                 
             |                                       
         
    
        
            | 
                12/13/2010
             | 
            
                +1.00 / +1.25%
             |             
            
                83.50
             |           
            
                83.50
             |               
            
                80.50
             |                           
            
                81.00
             | 
            
                81.00
             |                     
            
                25.70
             |                                 
            
                128,910
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/10/2010
             | 
            
                +2.00 / +2.56%
             |             
            
                77.00
             |           
            
                81.50
             |               
            
                77.00
             |                           
            
                80.00
             | 
            
                80.00
             |                     
            
                25.39
             |                                 
            
                30,230
             |            
            
                 
             |                                       
         
    
        
            | 
                12/9/2010
             | 
            
                0.00 / 0.00%
             |             
            
                77.50
             |           
            
                78.00
             |               
            
                77.50
             |                           
            
                78.00
             | 
            
                78.00
             |                     
            
                24.75
             |                                 
            
                160
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/8/2010
             | 
            
                0.00 / 0.00%
             |             
            
                75.50
             |           
            
                78.00
             |               
            
                75.00
             |                           
            
                78.00
             | 
            
                78.00
             |                     
            
                24.75
             |                                 
            
                6,410
             |            
            
                 
             |                                       
         
    
        
            | 
                12/7/2010
             | 
            
                -2.00 / -2.50%
             |             
            
                81.50
             |           
            
                81.50
             |               
            
                78.00
             |                           
            
                78.00
             | 
            
                78.00
             |                     
            
                24.75
             |                                 
            
                40,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/6/2010
             | 
            
                -1.50 / -1.84%
             |             
            
                82.00
             |           
            
                82.00
             |               
            
                80.00
             |                           
            
                80.00
             | 
            
                80.00
             |                     
            
                25.39
             |                                 
            
                57,010
             |            
            
                 
             |                                       
         
    
        
            | 
                12/3/2010
             | 
            
                0.00 / 0.00%
             |             
            
                85.00
             |           
            
                85.50
             |               
            
                80.00
             |                           
            
                81.50
             | 
            
                81.50
             |                     
            
                25.86
             |                                 
            
                28,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/2/2010
             | 
            
                +3.50 / +4.49%
             |             
            
                78.00
             |           
            
                81.50
             |               
            
                78.00
             |                           
            
                81.50
             | 
            
                81.50
             |                     
            
                25.86
             |                                 
            
                50,690
             |            
            
                 
             |                                       
         
    
        
            | 
                12/1/2010
             | 
            
                0.00 / 0.00%
             |             
            
                77.50
             |           
            
                78.00
             |               
            
                77.50
             |                           
            
                78.00
             | 
            
                78.00
             |                     
            
                24.75
             |                                 
            
                10,410
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/30/2010
             | 
            
                0.00 / 0.00%
             |             
            
                81.50
             |           
            
                81.50
             |               
            
                77.50
             |                           
            
                78.00
             | 
            
                78.00
             |                     
            
                24.75
             |                                 
            
                12,610
             |            
            
                 
             |                                       
         
    
        
            | 
                11/29/2010
             | 
            
                0.00 / 0.00%
             |             
            
                78.00
             |           
            
                78.00
             |               
            
                78.00
             |                           
            
                78.00
             | 
            
                78.00
             |                     
            
                24.75
             |                                 
            
                0
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/26/2010
             | 
            
                -1.00 / -1.27%
             |             
            
                78.00
             |           
            
                78.50
             |               
            
                78.00
             |                           
            
                78.00
             | 
            
                78.00
             |                     
            
                24.75
             |                                 
            
                23,080
             |            
            
                 
             |                                       
         
    
        
            | 
                11/25/2010
             | 
            
                +0.50 / +0.64%
             |             
            
                78.00
             |           
            
                81.00
             |               
            
                78.00
             |                           
            
                79.00
             | 
            
                79.00
             |                     
            
                25.07
             |                                 
            
                30,480
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/24/2010
             | 
            
                +3.50 / +4.67%
             |             
            
                74.00
             |           
            
                78.50
             |               
            
                74.00
             |                           
            
                78.50
             | 
            
                78.50
             |                     
            
                24.91
             |                                 
            
                13,450
             |            
            
                 
             |                                       
         
    
        
            | 
                11/23/2010
             | 
            
                +0.50 / +0.67%
             |             
            
                75.00
             |           
            
                75.00
             |               
            
                74.50
             |                           
            
                75.00
             | 
            
                75.00
             |                     
            
                23.80
             |                                 
            
                640
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/22/2010
             | 
            
                -0.50 / -0.67%
             |             
            
                73.50
             |           
            
                75.00
             |               
            
                73.00
             |                           
            
                74.50
             | 
            
                74.50
             |                     
            
                23.64
             |                                 
            
                45,320
             |            
            
                 
             |                                       
         
    
        
            | 
                11/19/2010
             | 
            
                -1.00 / -1.32%
             |             
            
                75.50
             |           
            
                76.00
             |               
            
                75.00
             |                           
            
                75.00
             | 
            
                75.00
             |                     
            
                23.80
             |                                 
            
                16,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/18/2010
             | 
            
                0.00 / 0.00%
             |             
            
                75.50
             |           
            
                76.00
             |               
            
                75.50
             |                           
            
                76.00
             | 
            
                76.00
             |                     
            
                24.12
             |                                 
            
                17,040
             |            
            
                 
             |                                       
         
    
        
            | 
                11/17/2010
             | 
            
                -0.50 / -0.65%
             |             
            
                75.50
             |           
            
                76.00
             |               
            
                75.50
             |                           
            
                76.00
             | 
            
                76.00
             |                     
            
                24.12
             |                                 
            
                20,030
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/16/2010
             | 
            
                -0.50 / -0.65%
             |             
            
                77.00
             |           
            
                77.00
             |               
            
                74.00
             |                           
            
                76.50
             | 
            
                76.50
             |                     
            
                24.28
             |                                 
            
                13,700
             |            
            
                 
             |                                       
         
    
        
            | 
                11/15/2010
             | 
            
                +1.00 / +1.32%
             |             
            
                74.00
             |           
            
                77.00
             |               
            
                74.00
             |                           
            
                77.00
             | 
            
                77.00
             |                     
            
                24.43
             |                                 
            
                16,650
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/12/2010
             | 
            
                0.00 / 0.00%
             |             
            
                78.00
             |           
            
                78.00
             |               
            
                72.50
             |                           
            
                76.00
             | 
            
                76.00
             |                     
            
                24.12
             |                                 
            
                24,890
             |            
            
                 
             |                                       
         
    
        
            | 
                11/11/2010
             | 
            
                -2.00 / -2.56%
             |             
            
                77.00
             |           
            
                77.00
             |               
            
                76.00
             |                           
            
                76.00
             | 
            
                76.00
             |                     
            
                24.12
             |                                 
            
                1,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/10/2010
             | 
            
                0.00 / 0.00%
             |             
            
                76.00
             |           
            
                78.00
             |               
            
                76.00
             |                           
            
                78.00
             | 
            
                78.00
             |                     
            
                24.75
             |                                 
            
                4,310
             |            
            
                 
             |                                       
         
    
        
            | 
                11/9/2010
             | 
            
                -0.50 / -0.64%
             |             
            
                78.00
             |           
            
                78.50
             |               
            
                76.50
             |                           
            
                78.00
             | 
            
                78.00
             |                     
            
                24.75
             |                                 
            
                25,930
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/8/2010
             | 
            
                +0.50 / +0.64%
             |             
            
                77.00
             |           
            
                78.50
             |               
            
                77.00
             |                           
            
                78.50
             | 
            
                78.50
             |                     
            
                24.91
             |                                 
            
                36,770
             |            
            
                 
             |                                       
         
    
        
            | 
                11/5/2010
             | 
            
                0.00 / 0.00%
             |             
            
                75.00
             |           
            
                78.00
             |               
            
                75.00
             |                           
            
                78.00
             | 
            
                78.00
             |                     
            
                24.75
             |                                 
            
                10,910
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/4/2010
             | 
            
                +0.50 / +0.65%
             |             
            
                78.00
             |           
            
                78.00
             |               
            
                78.00
             |                           
            
                78.00
             | 
            
                78.00
             |                     
            
                24.75
             |                                 
            
                10
             |            
            
                 
             |                                       
         
    
        
            | 
                11/3/2010
             | 
            
                -0.50 / -0.64%
             |             
            
                78.00
             |           
            
                78.00
             |               
            
                77.50
             |                           
            
                77.50
             | 
            
                77.50
             |                     
            
                24.59
             |                                 
            
                4,920
             |  
            
                 
             |                                                              
             
    
         
    
    
 |