| 
                 
                    Closing price on 5/20/2011
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    19.20 | 
                 
                
                    | High | 
                    20.50 | 
                 
                
                    | Low | 
                    19.20 | 
                     
                
                    | Volume | 
                    65,250 | 
                                 
                
                    | Split-adjusted Price | 
                    5.73 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
BTT Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                5/20/2011
             | 
            
                +0.90 / +4.59%
             |             
            
                19.20
             |           
            
                20.50
             |               
            
                19.20
             |                           
            
                20.50
             | 
            
                20.50
             |                     
            
                5.73
             |                                 
            
                65,250
             |            
            
                 
             |                                       
         
    
        
            | 
                5/19/2011
             | 
            
                -0.10 / -0.51%
             |             
            
                19.50
             |           
            
                20.20
             |               
            
                18.80
             |                           
            
                19.60
             | 
            
                19.60
             |                     
            
                5.48
             |                                 
            
                73,260
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/18/2011
             | 
            
                -0.60 / -2.96%
             |             
            
                19.90
             |           
            
                20.40
             |               
            
                19.70
             |                           
            
                19.70
             | 
            
                19.70
             |                     
            
                5.51
             |                                 
            
                36,470
             |            
            
                 
             |                                       
         
    
        
            | 
                5/17/2011
             | 
            
                +0.20 / +1.00%
             |             
            
                19.40
             |           
            
                20.30
             |               
            
                19.40
             |                           
            
                20.30
             | 
            
                20.30
             |                     
            
                5.67
             |                                 
            
                69,840
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/16/2011
             | 
            
                -0.90 / -4.29%
             |             
            
                20.30
             |           
            
                20.80
             |               
            
                20.10
             |                           
            
                20.10
             | 
            
                20.10
             |                     
            
                5.62
             |                                 
            
                17,130
             |            
            
                 
             |                                       
         
    
        
            | 
                5/13/2011
             | 
            
                0.00 / 0.00%
             |             
            
                20.40
             |           
            
                21.60
             |               
            
                20.40
             |                           
            
                21.00
             | 
            
                21.00
             |                     
            
                5.87
             |                                 
            
                24,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/12/2011
             | 
            
                +0.40 / +1.94%
             |             
            
                20.80
             |           
            
                21.60
             |               
            
                20.70
             |                           
            
                21.00
             | 
            
                21.00
             |                     
            
                5.87
             |                                 
            
                97,910
             |            
            
                 
             |                                       
         
    
        
            | 
                5/11/2011
             | 
            
                +0.50 / +2.49%
             |             
            
                20.20
             |           
            
                21.10
             |               
            
                19.90
             |                           
            
                20.60
             | 
            
                20.60
             |                     
            
                5.76
             |                                 
            
                94,070
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/10/2011
             | 
            
                +0.80 / +4.15%
             |             
            
                19.80
             |           
            
                20.20
             |               
            
                19.40
             |                           
            
                20.10
             | 
            
                20.10
             |                     
            
                5.62
             |                                 
            
                54,830
             |            
            
                 
             |                                       
         
    
        
            | 
                5/9/2011
             | 
            
                +0.30 / +1.58%
             |             
            
                19.50
             |           
            
                19.50
             |               
            
                18.70
             |                           
            
                19.30
             | 
            
                19.30
             |                     
            
                5.39
             |                                 
            
                10,610
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/6/2011
             | 
            
                0.00 / 0.00%
             |             
            
                19.10
             |           
            
                19.70
             |               
            
                19.00
             |                           
            
                19.00
             | 
            
                19.00
             |                     
            
                5.31
             |                                 
            
                46,190
             |            
            
                 
             |                                       
         
    
        
            | 
                5/5/2011
             | 
            
                -0.10 / -0.52%
             |             
            
                18.30
             |           
            
                19.30
             |               
            
                18.20
             |                           
            
                19.00
             | 
            
                19.00
             |                     
            
                5.31
             |                                 
            
                48,460
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/4/2011
             | 
            
                -0.90 / -4.50%
             |             
            
                19.50
             |           
            
                19.70
             |               
            
                19.10
             |                           
            
                19.10
             | 
            
                19.10
             |                     
            
                5.34
             |                                 
            
                5,950
             |            
            
                 
             |                                       
         
    
        
            | 
                4/29/2011
             | 
            
                0.00 / 0.00%
             |             
            
                19.90
             |           
            
                20.00
             |               
            
                19.90
             |                           
            
                20.00
             | 
            
                20.00
             |                     
            
                5.59
             |                                 
            
                5,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/28/2011
             | 
            
                -1.00 / -4.76%
             |             
            
                18.90
             |           
            
                20.30
             |               
            
                18.80
             |                           
            
                20.00
             | 
            
                20.00
             |                     
            
                5.59
             |                                 
            
                45,630
             |            
            
                 
             |                                       
         
    
        
            | 
                4/27/2011
             | 
            
                +0.50 / +2.44%
             |             
            
                21.20
             |           
            
                21.20
             |               
            
                20.00
             |                           
            
                21.00
             | 
            
                21.00
             |                     
            
                5.51
             |                                 
            
                14,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/26/2011
             | 
            
                -0.90 / -4.21%
             |             
            
                20.50
             |           
            
                21.90
             |               
            
                20.40
             |                           
            
                20.50
             | 
            
                20.50
             |                     
            
                5.37
             |                                 
            
                102,990
             |            
            
                 
             |                                       
         
    
        
            | 
                4/25/2011
             | 
            
                +0.80 / +3.88%
             |             
            
                20.30
             |           
            
                21.60
             |               
            
                20.30
             |                           
            
                21.40
             | 
            
                21.40
             |                     
            
                5.61
             |                                 
            
                118,490
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/22/2011
             | 
            
                -0.90 / -4.19%
             |             
            
                21.30
             |           
            
                21.30
             |               
            
                20.60
             |                           
            
                20.60
             | 
            
                20.60
             |                     
            
                5.40
             |                                 
            
                51,510
             |            
            
                 
             |                                       
         
    
        
            | 
                4/21/2011
             | 
            
                0.00 / 0.00%
             |             
            
                21.50
             |           
            
                21.50
             |               
            
                20.60
             |                           
            
                21.50
             | 
            
                21.50
             |                     
            
                5.64
             |                                 
            
                64,670
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/20/2011
             | 
            
                -0.30 / -1.38%
             |             
            
                21.60
             |           
            
                21.60
             |               
            
                21.10
             |                           
            
                21.50
             | 
            
                21.50
             |                     
            
                5.64
             |                                 
            
                29,000
             |            
            
                 
             |                                       
         
    
        
            | 
                4/19/2011
             | 
            
                +0.10 / +0.46%
             |             
            
                21.30
             |           
            
                21.90
             |               
            
                21.30
             |                           
            
                21.80
             | 
            
                21.80
             |                     
            
                5.72
             |                                 
            
                39,050
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/18/2011
             | 
            
                -0.20 / -0.91%
             |             
            
                22.30
             |           
            
                22.30
             |               
            
                21.40
             |                           
            
                21.70
             | 
            
                21.70
             |                     
            
                5.69
             |                                 
            
                64,570
             |            
            
                 
             |                                       
         
    
        
            | 
                4/15/2011
             | 
            
                +0.90 / +4.29%
             |             
            
                20.80
             |           
            
                22.00
             |               
            
                20.80
             |                           
            
                21.90
             | 
            
                21.90
             |                     
            
                5.74
             |                                 
            
                143,490
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/14/2011
             | 
            
                -0.50 / -2.33%
             |             
            
                21.60
             |           
            
                22.00
             |               
            
                21.00
             |                           
            
                21.00
             | 
            
                21.00
             |                     
            
                5.51
             |                                 
            
                7,420
             |            
            
                 
             |                                       
         
    
        
            | 
                4/13/2011
             | 
            
                -0.60 / -2.71%
             |             
            
                22.00
             |           
            
                22.00
             |               
            
                21.20
             |                           
            
                21.50
             | 
            
                21.50
             |                     
            
                5.64
             |                                 
            
                33,330
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/8/2011
             | 
            
                -1.10 / -4.74%
             |             
            
                22.30
             |           
            
                23.40
             |               
            
                22.10
             |                           
            
                22.10
             | 
            
                22.10
             |                     
            
                5.79
             |                                 
            
                67,100
             |            
            
                 
             |                                       
         
    
        
            | 
                4/7/2011
             | 
            
                +0.50 / +2.20%
             |             
            
                23.30
             |           
            
                23.50
             |               
            
                22.80
             |                           
            
                23.20
             | 
            
                23.20
             |                     
            
                6.08
             |                                 
            
                187,810
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/6/2011
             | 
            
                +1.00 / +4.61%
             |             
            
                21.70
             |           
            
                22.70
             |               
            
                21.70
             |                           
            
                22.70
             | 
            
                22.70
             |                     
            
                5.95
             |                                 
            
                104,960
             |            
            
                 
             |                                       
         
    
        
            | 
                4/5/2011
             | 
            
                +1.00 / +4.83%
             |             
            
                20.20
             |           
            
                21.70
             |               
            
                20.00
             |                           
            
                21.70
             | 
            
                21.70
             |                     
            
                5.69
             |                                 
            
                62,430
             |  
            
                 
             |                                                              
             
    
         
    
    
 |