| 
                 
                    Closing price on 2/14/2011
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    80.00 | 
                 
                
                    | High | 
                    80.00 | 
                 
                
                    | Low | 
                    80.00 | 
                     
                
                    | Volume | 
                    6,100 | 
                                 
                
                    | Split-adjusted Price | 
                    25.39 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
NBB Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                2/14/2011
             | 
            
                0.00 / 0.00%
             |             
            
                80.00
             |           
            
                80.00
             |               
            
                80.00
             |                           
            
                80.00
             | 
            
                80.00
             |                     
            
                25.39
             |                                 
            
                6,100
             |            
            
                 
             |                                       
         
    
        
            | 
                2/11/2011
             | 
            
                -3.00 / -3.61%
             |             
            
                80.00
             |           
            
                80.00
             |               
            
                80.00
             |                           
            
                80.00
             | 
            
                80.00
             |                     
            
                25.39
             |                                 
            
                310
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/10/2011
             | 
            
                0.00 / 0.00%
             |             
            
                83.00
             |           
            
                83.00
             |               
            
                83.00
             |                           
            
                83.00
             | 
            
                83.00
             |                     
            
                26.34
             |                                 
            
                0
             |            
            
                 
             |                                       
         
    
        
            | 
                2/9/2011
             | 
            
                0.00 / 0.00%
             |             
            
                83.00
             |           
            
                83.00
             |               
            
                83.00
             |                           
            
                83.00
             | 
            
                83.00
             |                     
            
                26.34
             |                                 
            
                0
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/8/2011
             | 
            
                +2.00 / +2.47%
             |             
            
                83.00
             |           
            
                83.00
             |               
            
                83.00
             |                           
            
                83.00
             | 
            
                83.00
             |                     
            
                26.34
             |                                 
            
                90
             |            
            
                 
             |                                       
         
    
        
            | 
                1/28/2011
             | 
            
                +2.00 / +2.53%
             |             
            
                81.00
             |           
            
                81.00
             |               
            
                81.00
             |                           
            
                81.00
             | 
            
                81.00
             |                     
            
                25.70
             |                                 
            
                40
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/27/2011
             | 
            
                -1.00 / -1.25%
             |             
            
                81.00
             |           
            
                81.00
             |               
            
                79.00
             |                           
            
                79.00
             | 
            
                79.00
             |                     
            
                25.07
             |                                 
            
                2,000
             |            
            
                 
             |                                       
         
    
        
            | 
                1/26/2011
             | 
            
                +1.00 / +1.27%
             |             
            
                82.50
             |           
            
                82.50
             |               
            
                80.00
             |                           
            
                80.00
             | 
            
                80.00
             |                     
            
                25.39
             |                                 
            
                1,120
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/25/2011
             | 
            
                0.00 / 0.00%
             |             
            
                78.50
             |           
            
                79.00
             |               
            
                78.50
             |                           
            
                79.00
             | 
            
                79.00
             |                     
            
                25.07
             |                                 
            
                18,400
             |            
            
                 
             |                                       
         
    
        
            | 
                1/24/2011
             | 
            
                -1.00 / -1.25%
             |             
            
                79.00
             |           
            
                79.00
             |               
            
                78.00
             |                           
            
                79.00
             | 
            
                79.00
             |                     
            
                25.07
             |                                 
            
                34,700
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/21/2011
             | 
            
                -2.50 / -3.03%
             |             
            
                79.00
             |           
            
                80.00
             |               
            
                79.00
             |                           
            
                80.00
             | 
            
                80.00
             |                     
            
                25.39
             |                                 
            
                146,090
             |            
            
                 
             |                                       
         
    
        
            | 
                1/20/2011
             | 
            
                +2.50 / +3.13%
             |             
            
                82.50
             |           
            
                82.50
             |               
            
                82.50
             |                           
            
                82.50
             | 
            
                82.50
             |                     
            
                26.18
             |                                 
            
                10
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/19/2011
             | 
            
                +1.00 / +1.27%
             |             
            
                79.00
             |           
            
                80.00
             |               
            
                79.00
             |                           
            
                80.00
             | 
            
                80.00
             |                     
            
                25.39
             |                                 
            
                5,020
             |            
            
                 
             |                                       
         
    
        
            | 
                1/18/2011
             | 
            
                -4.00 / -4.82%
             |             
            
                79.00
             |           
            
                79.00
             |               
            
                79.00
             |                           
            
                79.00
             | 
            
                79.00
             |                     
            
                25.07
             |                                 
            
                63,560
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/17/2011
             | 
            
                -0.50 / -0.60%
             |             
            
                82.00
             |           
            
                83.50
             |               
            
                82.00
             |                           
            
                83.00
             | 
            
                83.00
             |                     
            
                26.34
             |                                 
            
                25,020
             |            
            
                 
             |                                       
         
    
        
            | 
                1/14/2011
             | 
            
                +0.50 / +0.60%
             |             
            
                83.50
             |           
            
                83.50
             |               
            
                83.50
             |                           
            
                83.50
             | 
            
                83.50
             |                     
            
                26.50
             |                                 
            
                20
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/13/2011
             | 
            
                +1.50 / +1.84%
             |             
            
                81.50
             |           
            
                83.00
             |               
            
                81.50
             |                           
            
                83.00
             | 
            
                83.00
             |                     
            
                26.34
             |                                 
            
                6,010
             |            
            
                 
             |                                       
         
    
        
            | 
                1/12/2011
             | 
            
                -4.00 / -4.68%
             |             
            
                84.00
             |           
            
                88.50
             |               
            
                81.50
             |                           
            
                81.50
             | 
            
                81.50
             |                     
            
                25.86
             |                                 
            
                7,280
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/11/2011
             | 
            
                -0.50 / -0.58%
             |             
            
                85.50
             |           
            
                85.50
             |               
            
                85.50
             |                           
            
                85.50
             | 
            
                85.50
             |                     
            
                27.13
             |                                 
            
                10
             |            
            
                 
             |                                       
         
    
        
            | 
                1/10/2011
             | 
            
                0.00 / 0.00%
             |             
            
                86.00
             |           
            
                86.00
             |               
            
                86.00
             |                           
            
                86.00
             | 
            
                86.00
             |                     
            
                27.29
             |                                 
            
                0
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/7/2011
             | 
            
                -1.00 / -1.15%
             |             
            
                89.50
             |           
            
                89.50
             |               
            
                86.00
             |                           
            
                86.00
             | 
            
                86.00
             |                     
            
                27.29
             |                                 
            
                50
             |            
            
                 
             |                                       
         
    
        
            | 
                1/6/2011
             | 
            
                0.00 / 0.00%
             |             
            
                87.00
             |           
            
                87.00
             |               
            
                87.00
             |                           
            
                87.00
             | 
            
                87.00
             |                     
            
                27.61
             |                                 
            
                0
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/5/2011
             | 
            
                -1.00 / -1.14%
             |             
            
                85.00
             |           
            
                87.00
             |               
            
                85.00
             |                           
            
                87.00
             | 
            
                87.00
             |                     
            
                27.61
             |                                 
            
                50,060
             |            
            
                 
             |                                       
         
    
        
            | 
                1/4/2011
             | 
            
                0.00 / 0.00%
             |             
            
                88.00
             |           
            
                88.00
             |               
            
                88.00
             |                           
            
                88.00
             | 
            
                88.00
             |                     
            
                27.92
             |                                 
            
                20
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/31/2010
             | 
            
                +4.00 / +4.76%
             |             
            
                84.50
             |           
            
                88.00
             |               
            
                84.00
             |                           
            
                88.00
             | 
            
                88.00
             |                     
            
                27.92
             |                                 
            
                48,330
             |            
            
                 
             |                                       
         
    
        
            | 
                12/30/2010
             | 
            
                -0.50 / -0.59%
             |             
            
                84.50
             |           
            
                84.50
             |               
            
                83.50
             |                           
            
                84.00
             | 
            
                84.00
             |                     
            
                26.66
             |                                 
            
                48,560
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/29/2010
             | 
            
                +2.50 / +3.05%
             |             
            
                84.50
             |           
            
                84.50
             |               
            
                84.50
             |                           
            
                84.50
             | 
            
                84.50
             |                     
            
                26.81
             |                                 
            
                29,060
             |            
            
                 
             |                                       
         
    
        
            | 
                12/28/2010
             | 
            
                +3.00 / +3.80%
             |             
            
                79.00
             |           
            
                82.50
             |               
            
                79.00
             |                           
            
                82.00
             | 
            
                82.00
             |                     
            
                26.02
             |                                 
            
                9,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/27/2010
             | 
            
                0.00 / 0.00%
             |             
            
                79.00
             |           
            
                79.00
             |               
            
                79.00
             |                           
            
                79.00
             | 
            
                79.00
             |                     
            
                25.07
             |                                 
            
                17,000
             |            
            
                 
             |                                       
         
    
        
            | 
                12/24/2010
             | 
            
                -0.50 / -0.63%
             |             
            
                79.00
             |           
            
                79.00
             |               
            
                78.50
             |                           
            
                79.00
             | 
            
                79.00
             |                     
            
                25.07
             |                                 
            
                230,010
             |  
            
                 
             |                                                              
             
    
         
    
    
 |