| 
                 
                    Closing price on 11/8/2011
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    5.20 | 
                 
                
                    | High | 
                    5.30 | 
                 
                
                    | Low | 
                    5.20 | 
                     
                
                    | Volume | 
                    29,700 | 
                                 
                
                    | Split-adjusted Price | 
                    5.30 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
PV2 Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                11/8/2011
             | 
            
                +0.20 / +3.92%
             |             
            
                5.20
             |           
            
                5.30
             |               
            
                5.20
             |                           
            
                5.30
             | 
            
                5.21
             |                     
            
                5.30
             |                                 
            
                29,700
             |            
            
                 
             |                                       
         
    
        
            | 
                11/7/2011
             | 
            
                -0.30 / -5.56%
             |             
            
                5.30
             |           
            
                5.30
             |               
            
                5.10
             |                           
            
                5.10
             | 
            
                5.19
             |                     
            
                5.10
             |                                 
            
                28,700
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/4/2011
             | 
            
                +0.10 / +1.89%
             |             
            
                5.30
             |           
            
                5.40
             |               
            
                5.30
             |                           
            
                5.40
             | 
            
                5.30
             |                     
            
                5.40
             |                                 
            
                33,600
             |            
            
                 
             |                                       
         
    
        
            | 
                11/3/2011
             | 
            
                -0.10 / -1.85%
             |             
            
                5.30
             |           
            
                5.30
             |               
            
                5.30
             |                           
            
                5.30
             | 
            
                5.30
             |                     
            
                5.30
             |                                 
            
                14,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/2/2011
             | 
            
                0.00 / 0.00%
             |             
            
                5.40
             |           
            
                5.40
             |               
            
                5.30
             |                           
            
                5.40
             | 
            
                5.34
             |                     
            
                5.40
             |                                 
            
                27,200
             |            
            
                 
             |                                       
         
    
        
            | 
                11/1/2011
             | 
            
                -0.10 / -1.82%
             |             
            
                5.50
             |           
            
                5.60
             |               
            
                5.40
             |                           
            
                5.40
             | 
            
                5.53
             |                     
            
                5.40
             |                                 
            
                66,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/31/2011
             | 
            
                -0.20 / -3.51%
             |             
            
                5.90
             |           
            
                5.90
             |               
            
                5.50
             |                           
            
                5.50
             | 
            
                5.71
             |                     
            
                5.50
             |                                 
            
                46,200
             |            
            
                 
             |                                       
         
    
        
            | 
                10/28/2011
             | 
            
                +0.20 / +3.64%
             |             
            
                5.50
             |           
            
                5.70
             |               
            
                5.50
             |                           
            
                5.70
             | 
            
                5.65
             |                     
            
                5.70
             |                                 
            
                87,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/27/2011
             | 
            
                +0.20 / +3.77%
             |             
            
                5.40
             |           
            
                5.50
             |               
            
                5.40
             |                           
            
                5.50
             | 
            
                5.43
             |                     
            
                5.50
             |                                 
            
                44,300
             |            
            
                 
             |                                       
         
    
        
            | 
                10/26/2011
             | 
            
                0.00 / 0.00%
             |             
            
                5.60
             |           
            
                5.60
             |               
            
                5.30
             |                           
            
                5.30
             | 
            
                5.30
             |                     
            
                5.30
             |                                 
            
                43,700
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/25/2011
             | 
            
                -0.10 / -1.85%
             |             
            
                5.40
             |           
            
                5.40
             |               
            
                5.30
             |                           
            
                5.30
             | 
            
                5.30
             |                     
            
                5.30
             |                                 
            
                21,000
             |            
            
                 
             |                                       
         
    
        
            | 
                10/24/2011
             | 
            
                -0.20 / -3.57%
             |             
            
                5.50
             |           
            
                5.60
             |               
            
                5.40
             |                           
            
                5.40
             | 
            
                5.48
             |                     
            
                5.40
             |                                 
            
                19,200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/21/2011
             | 
            
                +0.20 / +3.70%
             |             
            
                5.30
             |           
            
                5.60
             |               
            
                5.30
             |                           
            
                5.60
             | 
            
                5.42
             |                     
            
                5.60
             |                                 
            
                57,000
             |            
            
                 
             |                                       
         
    
        
            | 
                10/20/2011
             | 
            
                +0.10 / +1.89%
             |             
            
                5.20
             |           
            
                5.40
             |               
            
                5.20
             |                           
            
                5.40
             | 
            
                5.31
             |                     
            
                5.40
             |                                 
            
                50,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/19/2011
             | 
            
                +0.10 / +1.92%
             |             
            
                5.30
             |           
            
                5.30
             |               
            
                5.10
             |                           
            
                5.30
             | 
            
                5.24
             |                     
            
                5.30
             |                                 
            
                15,100
             |            
            
                 
             |                                       
         
    
        
            | 
                10/18/2011
             | 
            
                0.00 / 0.00%
             |             
            
                5.20
             |           
            
                5.20
             |               
            
                5.10
             |                           
            
                5.20
             | 
            
                5.14
             |                     
            
                5.20
             |                                 
            
                53,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/17/2011
             | 
            
                +0.10 / +1.96%
             |             
            
                5.30
             |           
            
                5.30
             |               
            
                5.10
             |                           
            
                5.20
             | 
            
                5.18
             |                     
            
                5.20
             |                                 
            
                22,000
             |            
            
                 
             |                                       
         
    
        
            | 
                10/14/2011
             | 
            
                +0.10 / +2.00%
             |             
            
                5.30
             |           
            
                5.30
             |               
            
                4.90
             |                           
            
                5.10
             | 
            
                5.01
             |                     
            
                5.10
             |                                 
            
                58,700
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/13/2011
             | 
            
                0.00 / 0.00%
             |             
            
                5.10
             |           
            
                5.10
             |               
            
                5.00
             |                           
            
                5.00
             | 
            
                5.03
             |                     
            
                5.00
             |                                 
            
                14,000
             |            
            
                 
             |                                       
         
    
        
            | 
                10/12/2011
             | 
            
                -0.40 / -7.41%
             |             
            
                5.10
             |           
            
                5.10
             |               
            
                5.00
             |                           
            
                5.00
             | 
            
                5.03
             |                     
            
                5.00
             |                                 
            
                68,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/11/2011
             | 
            
                +0.10 / +1.89%
             |             
            
                5.30
             |           
            
                5.40
             |               
            
                5.30
             |                           
            
                5.40
             | 
            
                5.35
             |                     
            
                5.40
             |                                 
            
                24,000
             |            
            
                 
             |                                       
         
    
        
            | 
                10/10/2011
             | 
            
                -0.20 / -3.64%
             |             
            
                5.70
             |           
            
                5.70
             |               
            
                5.30
             |                           
            
                5.30
             | 
            
                5.32
             |                     
            
                5.30
             |                                 
            
                39,600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/7/2011
             | 
            
                -0.30 / -5.17%
             |             
            
                5.70
             |           
            
                5.80
             |               
            
                5.40
             |                           
            
                5.50
             | 
            
                5.46
             |                     
            
                5.50
             |                                 
            
                69,900
             |            
            
                 
             |                                       
         
    
        
            | 
                10/6/2011
             | 
            
                +0.30 / +5.45%
             |             
            
                5.40
             |           
            
                5.80
             |               
            
                5.40
             |                           
            
                5.80
             | 
            
                5.77
             |                     
            
                5.80
             |                                 
            
                37,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/5/2011
             | 
            
                -0.20 / -3.51%
             |             
            
                5.80
             |           
            
                5.80
             |               
            
                5.50
             |                           
            
                5.50
             | 
            
                5.56
             |                     
            
                5.50
             |                                 
            
                27,200
             |            
            
                 
             |                                       
         
    
        
            | 
                10/4/2011
             | 
            
                -0.20 / -3.39%
             |             
            
                5.60
             |           
            
                5.80
             |               
            
                5.60
             |                           
            
                5.70
             | 
            
                5.63
             |                     
            
                5.70
             |                                 
            
                90,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/3/2011
             | 
            
                -0.10 / -1.67%
             |             
            
                6.50
             |           
            
                6.50
             |               
            
                5.90
             |                           
            
                5.90
             | 
            
                6.03
             |                     
            
                5.90
             |                                 
            
                43,400
             |            
            
                 
             |                                       
         
    
        
            | 
                9/30/2011
             | 
            
                -0.20 / -3.23%
             |             
            
                6.30
             |           
            
                6.30
             |               
            
                6.00
             |                           
            
                6.00
             | 
            
                6.13
             |                     
            
                6.00
             |                                 
            
                16,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/29/2011
             | 
            
                -0.30 / -4.62%
             |             
            
                6.70
             |           
            
                6.70
             |               
            
                6.10
             |                           
            
                6.20
             | 
            
                6.23
             |                     
            
                6.20
             |                                 
            
                86,800
             |            
            
                 
             |                                       
         
    
        
            | 
                9/28/2011
             | 
            
                +0.40 / +6.56%
             |             
            
                6.20
             |           
            
                6.50
             |               
            
                6.10
             |                           
            
                6.50
             | 
            
                6.45
             |                     
            
                6.50
             |                                 
            
                248,200
             |  
            
                 
             |                                                              
             
    
         
    
    
 |