| 
                 
                    Closing price on 3/30/2012
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    21.80 | 
                 
                
                    | High | 
                    22.00 | 
                 
                
                    | Low | 
                    21.80 | 
                     
                
                    | Volume | 
                    6,000 | 
                                 
                
                    | Split-adjusted Price | 
                    6.74 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
BTT Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                3/30/2012
             | 
            
                -0.40 / -1.79%
             |             
            
                21.80
             |           
            
                22.00
             |               
            
                21.80
             |                           
            
                21.90
             | 
            
                21.90
             |                     
            
                6.74
             |                                 
            
                6,000
             |            
            
                 
             |                                       
         
    
        
            | 
                3/29/2012
             | 
            
                -1.10 / -4.70%
             |             
            
                23.40
             |           
            
                23.40
             |               
            
                22.30
             |                           
            
                22.30
             | 
            
                22.30
             |                     
            
                6.87
             |                                 
            
                1,180
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/28/2012
             | 
            
                +0.70 / +3.08%
             |             
            
                23.50
             |           
            
                23.50
             |               
            
                22.30
             |                           
            
                23.40
             | 
            
                23.40
             |                     
            
                7.20
             |                                 
            
                2,410
             |            
            
                 
             |                                       
         
    
        
            | 
                3/27/2012
             | 
            
                +0.60 / +2.71%
             |             
            
                23.10
             |           
            
                23.20
             |               
            
                22.50
             |                           
            
                22.70
             | 
            
                22.70
             |                     
            
                6.99
             |                                 
            
                28,540
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/26/2012
             | 
            
                +1.00 / +4.74%
             |             
            
                22.10
             |           
            
                22.10
             |               
            
                21.10
             |                           
            
                22.10
             | 
            
                22.10
             |                     
            
                6.80
             |                                 
            
                3,620
             |            
            
                 
             |                                       
         
    
        
            | 
                3/23/2012
             | 
            
                +1.00 / +4.98%
             |             
            
                20.80
             |           
            
                21.10
             |               
            
                20.50
             |                           
            
                21.10
             | 
            
                21.10
             |                     
            
                6.50
             |                                 
            
                5,760
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/22/2012
             | 
            
                +0.20 / +1.01%
             |             
            
                20.50
             |           
            
                20.60
             |               
            
                20.10
             |                           
            
                20.10
             | 
            
                20.10
             |                     
            
                6.19
             |                                 
            
                1,920
             |            
            
                 
             |                                       
         
    
        
            | 
                3/21/2012
             | 
            
                +0.90 / +4.74%
             |             
            
                19.60
             |           
            
                19.90
             |               
            
                19.60
             |                           
            
                19.90
             | 
            
                19.90
             |                     
            
                6.13
             |                                 
            
                17,070
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/20/2012
             | 
            
                -0.70 / -3.55%
             |             
            
                19.90
             |           
            
                19.90
             |               
            
                19.00
             |                           
            
                19.00
             | 
            
                19.00
             |                     
            
                5.85
             |                                 
            
                2,490
             |            
            
                 
             |                                       
         
    
        
            | 
                3/19/2012
             | 
            
                +0.70 / +3.68%
             |             
            
                19.10
             |           
            
                19.70
             |               
            
                19.10
             |                           
            
                19.70
             | 
            
                19.70
             |                     
            
                6.06
             |                                 
            
                1,560
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/16/2012
             | 
            
                +0.20 / +1.06%
             |             
            
                19.00
             |           
            
                19.00
             |               
            
                19.00
             |                           
            
                19.00
             | 
            
                19.00
             |                     
            
                5.85
             |                                 
            
                1,020
             |            
            
                 
             |                                       
         
    
        
            | 
                3/15/2012
             | 
            
                +0.10 / +0.53%
             |             
            
                18.90
             |           
            
                18.90
             |               
            
                18.80
             |                           
            
                18.80
             | 
            
                18.80
             |                     
            
                5.79
             |                                 
            
                2,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/14/2012
             | 
            
                0.00 / 0.00%
             |             
            
                18.70
             |           
            
                18.80
             |               
            
                18.70
             |                           
            
                18.70
             | 
            
                18.70
             |                     
            
                5.76
             |                                 
            
                4,020
             |            
            
                 
             |                                       
         
    
        
            | 
                3/13/2012
             | 
            
                -0.30 / -1.58%
             |             
            
                19.00
             |           
            
                19.00
             |               
            
                18.50
             |                           
            
                18.70
             | 
            
                18.70
             |                     
            
                5.76
             |                                 
            
                3,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/12/2012
             | 
            
                -0.50 / -2.56%
             |             
            
                19.00
             |           
            
                19.10
             |               
            
                19.00
             |                           
            
                19.00
             | 
            
                19.00
             |                     
            
                5.85
             |                                 
            
                4,120
             |            
            
                 
             |                                       
         
    
        
            | 
                3/9/2012
             | 
            
                -0.30 / -1.52%
             |             
            
                19.50
             |           
            
                19.50
             |               
            
                19.50
             |                           
            
                19.50
             | 
            
                19.50
             |                     
            
                6.00
             |                                 
            
                20
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/8/2012
             | 
            
                +0.80 / +4.21%
             |             
            
                19.90
             |           
            
                19.90
             |               
            
                19.70
             |                           
            
                19.80
             | 
            
                19.80
             |                     
            
                6.10
             |                                 
            
                70
             |            
            
                 
             |                                       
         
    
        
            | 
                3/7/2012
             | 
            
                -0.50 / -2.56%
             |             
            
                19.00
             |           
            
                19.00
             |               
            
                19.00
             |                           
            
                19.00
             | 
            
                19.00
             |                     
            
                5.85
             |                                 
            
                500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/6/2012
             | 
            
                0.00 / 0.00%
             |             
            
                19.50
             |           
            
                19.50
             |               
            
                19.00
             |                           
            
                19.50
             | 
            
                19.50
             |                     
            
                6.00
             |                                 
            
                19,610
             |            
            
                 
             |                                       
         
    
        
            | 
                3/5/2012
             | 
            
                +0.50 / +2.63%
             |             
            
                19.50
             |           
            
                19.50
             |               
            
                18.90
             |                           
            
                19.50
             | 
            
                19.50
             |                     
            
                6.00
             |                                 
            
                25,530
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/2/2012
             | 
            
                +0.50 / +2.70%
             |             
            
                19.00
             |           
            
                19.00
             |               
            
                19.00
             |                           
            
                19.00
             | 
            
                19.00
             |                     
            
                5.85
             |                                 
            
                20
             |            
            
                 
             |                                       
         
    
        
            | 
                3/1/2012
             | 
            
                -0.50 / -2.63%
             |             
            
                18.50
             |           
            
                18.50
             |               
            
                18.50
             |                           
            
                18.50
             | 
            
                18.50
             |                     
            
                5.70
             |                                 
            
                3,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/29/2012
             | 
            
                +0.40 / +2.15%
             |             
            
                18.60
             |           
            
                19.00
             |               
            
                18.60
             |                           
            
                19.00
             | 
            
                19.00
             |                     
            
                5.85
             |                                 
            
                11,290
             |            
            
                 
             |                                       
         
    
        
            | 
                2/28/2012
             | 
            
                -0.40 / -2.11%
             |             
            
                18.50
             |           
            
                18.60
             |               
            
                18.20
             |                           
            
                18.60
             | 
            
                18.60
             |                     
            
                5.73
             |                                 
            
                10,510
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/27/2012
             | 
            
                +0.50 / +2.70%
             |             
            
                19.00
             |           
            
                19.00
             |               
            
                19.00
             |                           
            
                19.00
             | 
            
                19.00
             |                     
            
                5.85
             |                                 
            
                10
             |            
            
                 
             |                                       
         
    
        
            | 
                2/24/2012
             | 
            
                -0.10 / -0.54%
             |             
            
                18.60
             |           
            
                18.60
             |               
            
                18.50
             |                           
            
                18.50
             | 
            
                18.50
             |                     
            
                5.70
             |                                 
            
                9,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/23/2012
             | 
            
                +0.10 / +0.54%
             |             
            
                18.80
             |           
            
                19.00
             |               
            
                18.60
             |                           
            
                18.60
             | 
            
                18.60
             |                     
            
                5.73
             |                                 
            
                5,030
             |            
            
                 
             |                                       
         
    
        
            | 
                2/22/2012
             | 
            
                0.00 / 0.00%
             |             
            
                18.50
             |           
            
                18.50
             |               
            
                18.50
             |                           
            
                18.50
             | 
            
                18.50
             |                     
            
                5.70
             |                                 
            
                6,480
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/21/2012
             | 
            
                +0.10 / +0.54%
             |             
            
                18.70
             |           
            
                18.70
             |               
            
                18.50
             |                           
            
                18.50
             | 
            
                18.50
             |                     
            
                5.70
             |                                 
            
                14,600
             |            
            
                 
             |                                       
         
    
        
            | 
                2/20/2012
             | 
            
                +0.10 / +0.55%
             |             
            
                18.50
             |           
            
                18.50
             |               
            
                18.30
             |                           
            
                18.40
             | 
            
                18.40
             |                     
            
                5.66
             |                                 
            
                5,390
             |  
            
                 
             |                                                              
             
    
         
    
    
 |