| 
                 
                    Closing price on 12/15/2011
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    41.80 | 
                 
                
                    | High | 
                    43.90 | 
                 
                
                    | Low | 
                    41.80 | 
                     
                
                    | Volume | 
                    510 | 
                                 
                
                    | Split-adjusted Price | 
                    14.23 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
NBB Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                12/15/2011
             | 
            
                0.00 / 0.00%
             |             
            
                41.80
             |           
            
                43.90
             |               
            
                41.80
             |                           
            
                43.90
             | 
            
                43.90
             |                     
            
                14.23
             |                                 
            
                510
             |            
            
                 
             |                                       
         
    
        
            | 
                12/14/2011
             | 
            
                +1.70 / +4.03%
             |             
            
                40.10
             |           
            
                43.90
             |               
            
                40.10
             |                           
            
                43.90
             | 
            
                43.90
             |                     
            
                14.23
             |                                 
            
                6,590
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/13/2011
             | 
            
                -2.10 / -4.74%
             |             
            
                46.30
             |           
            
                46.30
             |               
            
                42.20
             |                           
            
                42.20
             | 
            
                42.20
             |                     
            
                13.68
             |                                 
            
                20
             |            
            
                 
             |                                       
         
    
        
            | 
                12/12/2011
             | 
            
                +1.90 / +4.48%
             |             
            
                44.50
             |           
            
                44.50
             |               
            
                40.30
             |                           
            
                44.30
             | 
            
                44.30
             |                     
            
                14.36
             |                                 
            
                3,410
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/9/2011
             | 
            
                -2.20 / -4.93%
             |             
            
                46.70
             |           
            
                46.70
             |               
            
                42.40
             |                           
            
                42.40
             | 
            
                42.40
             |                     
            
                13.75
             |                                 
            
                420
             |            
            
                 
             |                                       
         
    
        
            | 
                12/8/2011
             | 
            
                0.00 / 0.00%
             |             
            
                42.50
             |           
            
                44.60
             |               
            
                42.50
             |                           
            
                44.60
             | 
            
                44.60
             |                     
            
                14.46
             |                                 
            
                30
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/7/2011
             | 
            
                -2.30 / -4.90%
             |             
            
                44.60
             |           
            
                44.60
             |               
            
                44.60
             |                           
            
                44.60
             | 
            
                44.60
             |                     
            
                14.46
             |                                 
            
                10
             |            
            
                 
             |                                       
         
    
        
            | 
                12/6/2011
             | 
            
                -2.40 / -4.87%
             |             
            
                46.90
             |           
            
                46.90
             |               
            
                46.90
             |                           
            
                46.90
             | 
            
                46.90
             |                     
            
                15.21
             |                                 
            
                10
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/5/2011
             | 
            
                +1.40 / +2.92%
             |             
            
                49.30
             |           
            
                49.30
             |               
            
                49.30
             |                           
            
                49.30
             | 
            
                49.30
             |                     
            
                15.99
             |                                 
            
                10,000
             |            
            
                 
             |                                       
         
    
        
            | 
                12/2/2011
             | 
            
                +0.80 / +1.70%
             |             
            
                47.90
             |           
            
                47.90
             |               
            
                47.90
             |                           
            
                47.90
             | 
            
                47.90
             |                     
            
                15.53
             |                                 
            
                10
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/1/2011
             | 
            
                +2.10 / +4.67%
             |             
            
                47.10
             |           
            
                47.10
             |               
            
                47.10
             |                           
            
                47.10
             | 
            
                47.10
             |                     
            
                15.27
             |                                 
            
                50
             |            
            
                 
             |                                       
         
    
        
            | 
                11/30/2011
             | 
            
                +0.60 / +1.35%
             |             
            
                45.00
             |           
            
                45.00
             |               
            
                45.00
             |                           
            
                45.00
             | 
            
                45.00
             |                     
            
                14.59
             |                                 
            
                10
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/29/2011
             | 
            
                -2.30 / -4.93%
             |             
            
                44.40
             |           
            
                47.00
             |               
            
                44.40
             |                           
            
                44.40
             | 
            
                44.40
             |                     
            
                14.40
             |                                 
            
                1,070
             |            
            
                 
             |                                       
         
    
        
            | 
                11/28/2011
             | 
            
                -2.40 / -4.89%
             |             
            
                50.00
             |           
            
                50.00
             |               
            
                46.70
             |                           
            
                46.70
             | 
            
                46.70
             |                     
            
                15.14
             |                                 
            
                1,780
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/25/2011
             | 
            
                -0.20 / -0.41%
             |             
            
                46.90
             |           
            
                49.10
             |               
            
                46.90
             |                           
            
                49.10
             | 
            
                49.10
             |                     
            
                15.92
             |                                 
            
                370
             |            
            
                 
             |                                       
         
    
        
            | 
                11/24/2011
             | 
            
                0.00 / 0.00%
             |             
            
                49.30
             |           
            
                49.30
             |               
            
                49.30
             |                           
            
                49.30
             | 
            
                49.30
             |                     
            
                15.99
             |                                 
            
                0
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/23/2011
             | 
            
                +2.30 / +4.89%
             |             
            
                49.30
             |           
            
                49.30
             |               
            
                49.30
             |                           
            
                49.30
             | 
            
                49.30
             |                     
            
                15.99
             |                                 
            
                34,510
             |            
            
                 
             |                                       
         
    
        
            | 
                11/22/2011
             | 
            
                0.00 / 0.00%
             |             
            
                47.00
             |           
            
                47.00
             |               
            
                47.00
             |                           
            
                47.00
             | 
            
                47.00
             |                     
            
                15.24
             |                                 
            
                39,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/21/2011
             | 
            
                +0.50 / +1.08%
             |             
            
                46.90
             |           
            
                47.00
             |               
            
                46.90
             |                           
            
                47.00
             | 
            
                47.00
             |                     
            
                15.24
             |                                 
            
                94,810
             |            
            
                 
             |                                       
         
    
        
            | 
                11/18/2011
             | 
            
                0.00 / 0.00%
             |             
            
                46.50
             |           
            
                46.50
             |               
            
                46.50
             |                           
            
                46.50
             | 
            
                46.50
             |                     
            
                15.08
             |                                 
            
                63,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/17/2011
             | 
            
                +1.00 / +2.20%
             |             
            
                46.90
             |           
            
                46.90
             |               
            
                43.30
             |                           
            
                46.50
             | 
            
                46.50
             |                     
            
                15.08
             |                                 
            
                12,690
             |            
            
                 
             |                                       
         
    
        
            | 
                11/16/2011
             | 
            
                +0.80 / +1.79%
             |             
            
                45.50
             |           
            
                45.50
             |               
            
                45.50
             |                           
            
                45.50
             | 
            
                45.50
             |                     
            
                14.75
             |                                 
            
                60,040
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/15/2011
             | 
            
                -2.20 / -4.69%
             |             
            
                48.70
             |           
            
                48.80
             |               
            
                44.70
             |                           
            
                44.70
             | 
            
                44.70
             |                     
            
                14.49
             |                                 
            
                85,350
             |            
            
                 
             |                                       
         
    
        
            | 
                11/14/2011
             | 
            
                +1.20 / +2.63%
             |             
            
                46.90
             |           
            
                46.90
             |               
            
                46.90
             |                           
            
                46.90
             | 
            
                46.90
             |                     
            
                15.21
             |                                 
            
                20,090
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/11/2011
             | 
            
                -2.30 / -4.79%
             |             
            
                48.00
             |           
            
                48.40
             |               
            
                45.70
             |                           
            
                45.70
             | 
            
                45.70
             |                     
            
                14.82
             |                                 
            
                10,050
             |            
            
                 
             |                                       
         
    
        
            | 
                11/10/2011
             | 
            
                +0.20 / +0.42%
             |             
            
                49.20
             |           
            
                49.20
             |               
            
                45.50
             |                           
            
                48.00
             | 
            
                48.00
             |                     
            
                15.56
             |                                 
            
                40,070
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/9/2011
             | 
            
                +1.30 / +2.80%
             |             
            
                47.70
             |           
            
                47.80
             |               
            
                47.70
             |                           
            
                47.80
             | 
            
                47.80
             |                     
            
                15.50
             |                                 
            
                6,590
             |            
            
                 
             |                                       
         
    
        
            | 
                11/8/2011
             | 
            
                -0.30 / -0.64%
             |             
            
                48.70
             |           
            
                48.70
             |               
            
                44.60
             |                           
            
                46.50
             | 
            
                46.50
             |                     
            
                15.08
             |                                 
            
                83,220
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/7/2011
             | 
            
                0.00 / 0.00%
             |             
            
                44.50
             |           
            
                49.00
             |               
            
                44.50
             |                           
            
                46.80
             | 
            
                46.80
             |                     
            
                15.17
             |                                 
            
                49,230
             |            
            
                 
             |                                       
         
    
        
            | 
                11/4/2011
             | 
            
                +2.10 / +4.70%
             |             
            
                46.80
             |           
            
                46.80
             |               
            
                43.10
             |                           
            
                46.80
             | 
            
                46.80
             |                     
            
                15.17
             |                                 
            
                34,330
             |  
            
                 
             |                                                              
             
    
         
    
    
 |