| 
                 
                    Closing price on 10/13/2011
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    5.10 | 
                 
                
                    | High | 
                    5.10 | 
                 
                
                    | Low | 
                    5.00 | 
                     
                
                    | Volume | 
                    14,000 | 
                                 
                
                    | Split-adjusted Price | 
                    5.00 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
PV2 Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                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
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/27/2011
             | 
            
                0.00 / 0.00%
             |             
            
                6.20
             |           
            
                6.20
             |               
            
                6.00
             |                           
            
                6.10
             | 
            
                6.07
             |                     
            
                6.10
             |                                 
            
                18,900
             |            
            
                 
             |                                       
         
    
        
            | 
                9/26/2011
             | 
            
                +0.10 / +1.67%
             |             
            
                6.20
             |           
            
                6.20
             |               
            
                6.00
             |                           
            
                6.10
             | 
            
                6.08
             |                     
            
                6.10
             |                                 
            
                10,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/23/2011
             | 
            
                -0.30 / -4.76%
             |             
            
                6.00
             |           
            
                6.20
             |               
            
                6.00
             |                           
            
                6.00
             | 
            
                6.04
             |                     
            
                6.00
             |                                 
            
                22,200
             |            
            
                 
             |                                       
         
    
        
            | 
                9/22/2011
             | 
            
                +0.30 / +5.00%
             |             
            
                6.20
             |           
            
                6.30
             |               
            
                5.90
             |                           
            
                6.30
             | 
            
                6.10
             |                     
            
                6.30
             |                                 
            
                29,600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/21/2011
             | 
            
                -0.10 / -1.64%
             |             
            
                6.00
             |           
            
                6.10
             |               
            
                6.00
             |                           
            
                6.00
             | 
            
                6.00
             |                     
            
                6.00
             |                                 
            
                45,600
             |            
            
                 
             |                                       
         
    
        
            | 
                9/20/2011
             | 
            
                -0.20 / -3.17%
             |             
            
                6.20
             |           
            
                6.20
             |               
            
                6.00
             |                           
            
                6.10
             | 
            
                6.06
             |                     
            
                6.10
             |                                 
            
                39,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/19/2011
             | 
            
                +0.30 / +5.00%
             |             
            
                6.00
             |           
            
                6.40
             |               
            
                6.00
             |                           
            
                6.30
             | 
            
                6.20
             |                     
            
                6.30
             |                                 
            
                78,300
             |            
            
                 
             |                                       
         
    
        
            | 
                9/16/2011
             | 
            
                -0.30 / -4.76%
             |             
            
                6.20
             |           
            
                6.20
             |               
            
                5.90
             |                           
            
                6.00
             | 
            
                5.96
             |                     
            
                6.00
             |                                 
            
                173,200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/15/2011
             | 
            
                -0.20 / -3.08%
             |             
            
                6.60
             |           
            
                6.60
             |               
            
                6.20
             |                           
            
                6.30
             | 
            
                6.28
             |                     
            
                6.30
             |                                 
            
                57,800
             |            
            
                 
             |                                       
         
    
        
            | 
                9/14/2011
             | 
            
                -0.30 / -4.41%
             |             
            
                7.00
             |           
            
                7.00
             |               
            
                6.40
             |                           
            
                6.50
             | 
            
                6.60
             |                     
            
                6.50
             |                                 
            
                36,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/13/2011
             | 
            
                +0.30 / +4.62%
             |             
            
                6.70
             |           
            
                6.80
             |               
            
                6.50
             |                           
            
                6.80
             | 
            
                6.74
             |                     
            
                6.80
             |                                 
            
                234,600
             |            
            
                 
             |                                       
         
    
        
            | 
                9/12/2011
             | 
            
                -0.30 / -4.41%
             |             
            
                6.60
             |           
            
                6.70
             |               
            
                6.40
             |                           
            
                6.50
             | 
            
                6.45
             |                     
            
                6.50
             |                                 
            
                322,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/9/2011
             | 
            
                +0.30 / +4.62%
             |             
            
                6.60
             |           
            
                6.90
             |               
            
                6.60
             |                           
            
                6.80
             | 
            
                6.83
             |                     
            
                6.80
             |                                 
            
                986,000
             |            
            
                 
             |                                       
         
    
        
            | 
                9/8/2011
             | 
            
                -0.30 / -4.41%
             |             
            
                6.70
             |           
            
                6.70
             |               
            
                6.50
             |                           
            
                6.50
             | 
            
                6.54
             |                     
            
                6.50
             |                                 
            
                273,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/7/2011
             | 
            
                +0.40 / +6.25%
             |             
            
                7.00
             |           
            
                7.20
             |               
            
                6.60
             |                           
            
                6.80
             | 
            
                6.91
             |                     
            
                6.80
             |                                 
            
                363,700
             |            
            
                 
             |                                       
         
    
        
            | 
                9/6/2011
             | 
            
                +0.10 / +1.59%
             |             
            
                6.60
             |           
            
                7.00
             |               
            
                6.20
             |                           
            
                6.40
             | 
            
                6.79
             |                     
            
                6.40
             |                                 
            
                351,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/5/2011
             | 
            
                0.00 / 0.00%
             |             
            
                6.60
             |           
            
                6.70
             |               
            
                6.30
             |                           
            
                6.30
             | 
            
                6.64
             |                     
            
                6.30
             |                                 
            
                337,600
             |            
            
                 
             |                                       
         
    
        
            | 
                9/1/2011
             | 
            
                +0.40 / +6.78%
             |             
            
                6.00
             |           
            
                6.30
             |               
            
                6.00
             |                           
            
                6.30
             | 
            
                6.28
             |                     
            
                6.30
             |                                 
            
                106,800
             |  
            
                 
             |                                                              
             
    
         
    
    
 |