| 
                 
                    Closing price on 4/12/2010
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    92.50 | 
                 
                
                    | High | 
                    92.50 | 
                 
                
                    | Low | 
                    92.50 | 
                     
                
                    | Volume | 
                    613,370 | 
                                 
                
                    | Split-adjusted Price | 
                    29.35 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
NBB Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                4/12/2010
             | 
            
                +4.00 / +4.52%
             |             
            
                92.50
             |           
            
                92.50
             |               
            
                92.50
             |                           
            
                92.50
             | 
            
                92.50
             |                     
            
                29.35
             |                                 
            
                613,370
             |            
            
                 
             |                                       
         
    
        
            | 
                4/9/2010
             | 
            
                +0.50 / +0.57%
             |             
            
                89.00
             |           
            
                89.00
             |               
            
                86.00
             |                           
            
                88.50
             | 
            
                88.50
             |                     
            
                28.08
             |                                 
            
                155,040
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/8/2010
             | 
            
                +4.00 / +4.76%
             |             
            
                87.50
             |           
            
                88.00
             |               
            
                87.50
             |                           
            
                88.00
             | 
            
                88.00
             |                     
            
                27.92
             |                                 
            
                193,980
             |            
            
                 
             |                                       
         
    
        
            | 
                4/7/2010
             | 
            
                +4.00 / +5.00%
             |             
            
                80.00
             |           
            
                84.00
             |               
            
                80.00
             |                           
            
                84.00
             | 
            
                84.00
             |                     
            
                26.66
             |                                 
            
                156,600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/6/2010
             | 
            
                +3.50 / +4.58%
             |             
            
                77.00
             |           
            
                80.00
             |               
            
                77.00
             |                           
            
                80.00
             | 
            
                80.00
             |                     
            
                25.39
             |                                 
            
                242,920
             |            
            
                 
             |                                       
         
    
        
            | 
                4/5/2010
             | 
            
                +3.50 / +4.79%
             |             
            
                73.50
             |           
            
                76.50
             |               
            
                73.00
             |                           
            
                76.50
             | 
            
                76.50
             |                     
            
                24.28
             |                                 
            
                192,620
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/2/2010
             | 
            
                +0.50 / +0.69%
             |             
            
                73.00
             |           
            
                73.50
             |               
            
                73.00
             |                           
            
                73.00
             | 
            
                73.00
             |                     
            
                23.16
             |                                 
            
                73,440
             |            
            
                 
             |                                       
         
    
        
            | 
                4/1/2010
             | 
            
                +1.00 / +1.40%
             |             
            
                71.50
             |           
            
                72.50
             |               
            
                71.50
             |                           
            
                72.50
             | 
            
                72.50
             |                     
            
                23.01
             |                                 
            
                80,540
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/31/2010
             | 
            
                0.00 / 0.00%
             |             
            
                71.50
             |           
            
                73.50
             |               
            
                70.00
             |                           
            
                71.50
             | 
            
                71.50
             |                     
            
                22.69
             |                                 
            
                41,590
             |            
            
                 
             |                                       
         
    
        
            | 
                3/30/2010
             | 
            
                0.00 / 0.00%
             |             
            
                72.00
             |           
            
                72.00
             |               
            
                71.50
             |                           
            
                71.50
             | 
            
                71.50
             |                     
            
                22.69
             |                                 
            
                54,970
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/29/2010
             | 
            
                -2.00 / -2.72%
             |             
            
                73.50
             |           
            
                73.50
             |               
            
                71.50
             |                           
            
                71.50
             | 
            
                71.50
             |                     
            
                22.69
             |                                 
            
                29,730
             |            
            
                 
             |                                       
         
    
        
            | 
                3/26/2010
             | 
            
                +0.50 / +0.68%
             |             
            
                73.00
             |           
            
                73.50
             |               
            
                71.50
             |                           
            
                73.50
             | 
            
                73.50
             |                     
            
                23.32
             |                                 
            
                106,740
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/25/2010
             | 
            
                +1.50 / +2.10%
             |             
            
                71.50
             |           
            
                73.00
             |               
            
                70.50
             |                           
            
                73.00
             | 
            
                73.00
             |                     
            
                23.16
             |                                 
            
                79,430
             |            
            
                 
             |                                       
         
    
        
            | 
                3/24/2010
             | 
            
                +0.50 / +0.70%
             |             
            
                71.00
             |           
            
                71.50
             |               
            
                71.00
             |                           
            
                71.50
             | 
            
                71.50
             |                     
            
                22.69
             |                                 
            
                72,550
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/23/2010
             | 
            
                0.00 / 0.00%
             |             
            
                72.00
             |           
            
                72.00
             |               
            
                68.50
             |                           
            
                71.00
             | 
            
                71.00
             |                     
            
                22.53
             |                                 
            
                12,380
             |            
            
                 
             |                                       
         
    
        
            | 
                3/22/2010
             | 
            
                0.00 / 0.00%
             |             
            
                72.00
             |           
            
                72.00
             |               
            
                70.00
             |                           
            
                71.00
             | 
            
                71.00
             |                     
            
                22.53
             |                                 
            
                17,040
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/19/2010
             | 
            
                -1.00 / -1.39%
             |             
            
                71.00
             |           
            
                72.00
             |               
            
                70.50
             |                           
            
                71.00
             | 
            
                71.00
             |                     
            
                22.53
             |                                 
            
                22,060
             |            
            
                 
             |                                       
         
    
        
            | 
                3/18/2010
             | 
            
                -1.00 / -1.37%
             |             
            
                73.00
             |           
            
                73.00
             |               
            
                71.00
             |                           
            
                72.00
             | 
            
                72.00
             |                     
            
                22.85
             |                                 
            
                34,970
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/17/2010
             | 
            
                +0.50 / +0.69%
             |             
            
                74.00
             |           
            
                74.00
             |               
            
                72.50
             |                           
            
                73.00
             | 
            
                73.00
             |                     
            
                23.16
             |                                 
            
                8,520
             |            
            
                 
             |                                       
         
    
        
            | 
                3/16/2010
             | 
            
                -1.50 / -2.03%
             |             
            
                74.00
             |           
            
                74.00
             |               
            
                72.50
             |                           
            
                72.50
             | 
            
                72.50
             |                     
            
                23.01
             |                                 
            
                76,380
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/15/2010
             | 
            
                +2.50 / +3.50%
             |             
            
                72.00
             |           
            
                75.00
             |               
            
                72.00
             |                           
            
                74.00
             | 
            
                74.00
             |                     
            
                23.48
             |                                 
            
                168,970
             |            
            
                 
             |                                       
         
    
        
            | 
                3/12/2010
             | 
            
                +0.50 / +0.70%
             |             
            
                71.00
             |           
            
                71.50
             |               
            
                70.50
             |                           
            
                71.50
             | 
            
                71.50
             |                     
            
                22.69
             |                                 
            
                13,360
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/11/2010
             | 
            
                -1.00 / -1.39%
             |             
            
                71.00
             |           
            
                72.00
             |               
            
                70.00
             |                           
            
                71.00
             | 
            
                71.00
             |                     
            
                22.53
             |                                 
            
                9,330
             |            
            
                 
             |                                       
         
    
        
            | 
                3/10/2010
             | 
            
                0.00 / 0.00%
             |             
            
                72.00
             |           
            
                72.00
             |               
            
                72.00
             |                           
            
                72.00
             | 
            
                72.00
             |                     
            
                22.85
             |                                 
            
                4,560
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/9/2010
             | 
            
                +0.50 / +0.70%
             |             
            
                71.50
             |           
            
                72.00
             |               
            
                71.50
             |                           
            
                72.00
             | 
            
                72.00
             |                     
            
                22.85
             |                                 
            
                13,790
             |            
            
                 
             |                                       
         
    
        
            | 
                3/8/2010
             | 
            
                +0.50 / +0.70%
             |             
            
                71.00
             |           
            
                71.50
             |               
            
                71.00
             |                           
            
                71.50
             | 
            
                71.50
             |                     
            
                22.69
             |                                 
            
                20,950
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/5/2010
             | 
            
                +0.50 / +0.71%
             |             
            
                72.00
             |           
            
                72.00
             |               
            
                70.00
             |                           
            
                71.00
             | 
            
                71.00
             |                     
            
                22.53
             |                                 
            
                27,010
             |            
            
                 
             |                                       
         
    
        
            | 
                3/4/2010
             | 
            
                +0.50 / +0.71%
             |             
            
                72.00
             |           
            
                72.00
             |               
            
                70.50
             |                           
            
                70.50
             | 
            
                70.50
             |                     
            
                22.37
             |                                 
            
                26,820
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/3/2010
             | 
            
                0.00 / 0.00%
             |             
            
                68.50
             |           
            
                70.00
             |               
            
                68.50
             |                           
            
                70.00
             | 
            
                70.00
             |                     
            
                22.21
             |                                 
            
                3,840
             |            
            
                 
             |                                       
         
    
        
            | 
                3/2/2010
             | 
            
                0.00 / 0.00%
             |             
            
                69.00
             |           
            
                70.00
             |               
            
                68.50
             |                           
            
                70.00
             | 
            
                70.00
             |                     
            
                22.21
             |                                 
            
                24,350
             |  
            
                 
             |                                                              
             
    
         
    
    
 |