| 
                 
                    Closing price on 4/16/2012
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    8.30 | 
                 
                
                    | High | 
                    8.60 | 
                 
                
                    | Low | 
                    8.20 | 
                     
                
                    | Volume | 
                    19,500 | 
                                 
                
                    | Split-adjusted Price | 
                    7.84 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
BT6 Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                4/16/2012
             | 
            
                +0.20 / +2.41%
             |             
            
                8.30
             |           
            
                8.60
             |               
            
                8.20
             |                           
            
                8.50
             | 
            
                8.50
             |                     
            
                7.84
             |                                 
            
                19,500
             |            
            
                 
             |                                       
         
    
        
            | 
                4/13/2012
             | 
            
                +0.10 / +1.22%
             |             
            
                8.20
             |           
            
                8.30
             |               
            
                8.00
             |                           
            
                8.30
             | 
            
                8.30
             |                     
            
                7.65
             |                                 
            
                16,770
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/12/2012
             | 
            
                +0.20 / +2.50%
             |             
            
                8.20
             |           
            
                8.30
             |               
            
                8.00
             |                           
            
                8.20
             | 
            
                8.20
             |                     
            
                7.56
             |                                 
            
                41,910
             |            
            
                 
             |                                       
         
    
        
            | 
                4/11/2012
             | 
            
                +0.20 / +2.56%
             |             
            
                7.80
             |           
            
                8.00
             |               
            
                7.80
             |                           
            
                8.00
             | 
            
                8.00
             |                     
            
                7.38
             |                                 
            
                12,260
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/10/2012
             | 
            
                0.00 / 0.00%
             |             
            
                7.80
             |           
            
                7.90
             |               
            
                7.60
             |                           
            
                7.80
             | 
            
                7.80
             |                     
            
                7.19
             |                                 
            
                9,150
             |            
            
                 
             |                                       
         
    
        
            | 
                4/9/2012
             | 
            
                0.00 / 0.00%
             |             
            
                7.80
             |           
            
                7.80
             |               
            
                7.60
             |                           
            
                7.80
             | 
            
                7.80
             |                     
            
                7.19
             |                                 
            
                7,550
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/6/2012
             | 
            
                0.00 / 0.00%
             |             
            
                7.70
             |           
            
                7.80
             |               
            
                7.70
             |                           
            
                7.80
             | 
            
                7.80
             |                     
            
                7.19
             |                                 
            
                1,800
             |            
            
                 
             |                                       
         
    
        
            | 
                4/5/2012
             | 
            
                +0.30 / +4.00%
             |             
            
                7.50
             |           
            
                7.80
             |               
            
                7.50
             |                           
            
                7.80
             | 
            
                7.80
             |                     
            
                7.19
             |                                 
            
                810
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/4/2012
             | 
            
                0.00 / 0.00%
             |             
            
                7.70
             |           
            
                7.70
             |               
            
                7.40
             |                           
            
                7.50
             | 
            
                7.50
             |                     
            
                6.92
             |                                 
            
                3,480
             |            
            
                 
             |                                       
         
    
        
            | 
                4/3/2012
             | 
            
                -0.10 / -1.32%
             |             
            
                7.80
             |           
            
                7.80
             |               
            
                7.50
             |                           
            
                7.50
             | 
            
                7.50
             |                     
            
                6.92
             |                                 
            
                9,390
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/30/2012
             | 
            
                0.00 / 0.00%
             |             
            
                7.30
             |           
            
                7.60
             |               
            
                7.30
             |                           
            
                7.60
             | 
            
                7.60
             |                     
            
                7.01
             |                                 
            
                2,230
             |            
            
                 
             |                                       
         
    
        
            | 
                3/29/2012
             | 
            
                -0.30 / -3.80%
             |             
            
                7.70
             |           
            
                7.80
             |               
            
                7.60
             |                           
            
                7.60
             | 
            
                7.60
             |                     
            
                7.01
             |                                 
            
                15,140
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/28/2012
             | 
            
                -0.10 / -1.25%
             |             
            
                7.70
             |           
            
                8.00
             |               
            
                7.70
             |                           
            
                7.90
             | 
            
                7.90
             |                     
            
                7.28
             |                                 
            
                7,500
             |            
            
                 
             |                                       
         
    
        
            | 
                3/27/2012
             | 
            
                -0.40 / -4.76%
             |             
            
                8.40
             |           
            
                8.40
             |               
            
                8.00
             |                           
            
                8.00
             | 
            
                8.00
             |                     
            
                7.38
             |                                 
            
                17,280
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/26/2012
             | 
            
                +0.40 / +5.00%
             |             
            
                8.40
             |           
            
                8.40
             |               
            
                8.00
             |                           
            
                8.40
             | 
            
                8.40
             |                     
            
                7.75
             |                                 
            
                13,650
             |            
            
                 
             |                                       
         
    
        
            | 
                3/23/2012
             | 
            
                +0.30 / +3.90%
             |             
            
                7.70
             |           
            
                8.00
             |               
            
                7.70
             |                           
            
                8.00
             | 
            
                8.00
             |                     
            
                7.38
             |                                 
            
                48,460
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/22/2012
             | 
            
                +0.20 / +2.67%
             |             
            
                7.80
             |           
            
                7.80
             |               
            
                7.50
             |                           
            
                7.70
             | 
            
                7.70
             |                     
            
                7.10
             |                                 
            
                3,610
             |            
            
                 
             |                                       
         
    
        
            | 
                3/21/2012
             | 
            
                +0.30 / +4.17%
             |             
            
                7.20
             |           
            
                7.50
             |               
            
                7.20
             |                           
            
                7.50
             | 
            
                7.50
             |                     
            
                6.92
             |                                 
            
                23,420
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/20/2012
             | 
            
                +0.10 / +1.41%
             |             
            
                7.10
             |           
            
                7.30
             |               
            
                7.10
             |                           
            
                7.20
             | 
            
                7.20
             |                     
            
                6.64
             |                                 
            
                11,700
             |            
            
                 
             |                                       
         
    
        
            | 
                3/19/2012
             | 
            
                -0.30 / -4.05%
             |             
            
                7.50
             |           
            
                7.50
             |               
            
                7.10
             |                           
            
                7.10
             | 
            
                7.10
             |                     
            
                6.55
             |                                 
            
                3,260
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/16/2012
             | 
            
                +0.20 / +2.78%
             |             
            
                7.30
             |           
            
                7.50
             |               
            
                7.20
             |                           
            
                7.40
             | 
            
                7.40
             |                     
            
                6.82
             |                                 
            
                13,190
             |            
            
                 
             |                                       
         
    
        
            | 
                3/15/2012
             | 
            
                +0.20 / +2.86%
             |             
            
                7.00
             |           
            
                7.20
             |               
            
                7.00
             |                           
            
                7.20
             | 
            
                7.20
             |                     
            
                6.64
             |                                 
            
                15,280
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/14/2012
             | 
            
                -0.10 / -1.41%
             |             
            
                7.00
             |           
            
                7.10
             |               
            
                7.00
             |                           
            
                7.00
             | 
            
                7.00
             |                     
            
                6.45
             |                                 
            
                5,120
             |            
            
                 
             |                                       
         
    
        
            | 
                3/13/2012
             | 
            
                +0.10 / +1.43%
             |             
            
                6.90
             |           
            
                7.10
             |               
            
                6.80
             |                           
            
                7.10
             | 
            
                7.10
             |                     
            
                6.55
             |                                 
            
                6,290
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/12/2012
             | 
            
                -0.10 / -1.41%
             |             
            
                7.10
             |           
            
                7.10
             |               
            
                6.80
             |                           
            
                7.00
             | 
            
                7.00
             |                     
            
                6.45
             |                                 
            
                4,040
             |            
            
                 
             |                                       
         
    
        
            | 
                3/9/2012
             | 
            
                -0.30 / -4.05%
             |             
            
                7.10
             |           
            
                7.20
             |               
            
                7.10
             |                           
            
                7.10
             | 
            
                7.10
             |                     
            
                6.55
             |                                 
            
                12,020
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/8/2012
             | 
            
                -0.30 / -3.90%
             |             
            
                7.40
             |           
            
                7.90
             |               
            
                7.40
             |                           
            
                7.40
             | 
            
                7.40
             |                     
            
                6.82
             |                                 
            
                22,690
             |            
            
                 
             |                                       
         
    
        
            | 
                3/7/2012
             | 
            
                0.00 / 0.00%
             |             
            
                7.90
             |           
            
                7.90
             |               
            
                7.40
             |                           
            
                7.70
             | 
            
                7.70
             |                     
            
                7.10
             |                                 
            
                16,200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/6/2012
             | 
            
                +0.30 / +4.05%
             |             
            
                7.70
             |           
            
                7.70
             |               
            
                7.50
             |                           
            
                7.70
             | 
            
                7.70
             |                     
            
                7.10
             |                                 
            
                67,570
             |            
            
                 
             |                                       
         
    
        
            | 
                3/5/2012
             | 
            
                +0.30 / +4.23%
             |             
            
                7.40
             |           
            
                7.40
             |               
            
                7.40
             |                           
            
                7.40
             | 
            
                7.40
             |                     
            
                6.82
             |                                 
            
                2,080
             |  
            
                 
             |                                                              
             
    
         
    
    
 |