| 
                 
                    Closing price on 3/20/2012
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    5.40 | 
                 
                
                    | High | 
                    5.50 | 
                 
                
                    | Low | 
                    5.40 | 
                     
                
                    | Volume | 
                    192,600 | 
                                 
                
                    | Split-adjusted Price | 
                    5.50 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
PV2 Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                3/20/2012
             | 
            
                +0.20 / +3.77%
             |             
            
                5.40
             |           
            
                5.50
             |               
            
                5.40
             |                           
            
                5.50
             | 
            
                5.42
             |                     
            
                5.50
             |                                 
            
                192,600
             |            
            
                 
             |                                       
         
    
        
            | 
                3/19/2012
             | 
            
                -0.20 / -3.64%
             |             
            
                5.60
             |           
            
                5.60
             |               
            
                5.30
             |                           
            
                5.30
             | 
            
                5.40
             |                     
            
                5.30
             |                                 
            
                111,600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/16/2012
             | 
            
                0.00 / 0.00%
             |             
            
                5.60
             |           
            
                5.70
             |               
            
                5.50
             |                           
            
                5.50
             | 
            
                5.55
             |                     
            
                5.50
             |                                 
            
                169,200
             |            
            
                 
             |                                       
         
    
        
            | 
                3/15/2012
             | 
            
                +0.30 / +5.77%
             |             
            
                5.20
             |           
            
                5.50
             |               
            
                5.10
             |                           
            
                5.50
             | 
            
                5.35
             |                     
            
                5.50
             |                                 
            
                183,200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/14/2012
             | 
            
                -0.20 / -3.70%
             |             
            
                5.60
             |           
            
                5.60
             |               
            
                5.10
             |                           
            
                5.20
             | 
            
                5.25
             |                     
            
                5.20
             |                                 
            
                66,100
             |            
            
                 
             |                                       
         
    
        
            | 
                3/13/2012
             | 
            
                +0.30 / +5.88%
             |             
            
                5.20
             |           
            
                5.40
             |               
            
                5.20
             |                           
            
                5.40
             | 
            
                5.36
             |                     
            
                5.40
             |                                 
            
                59,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/12/2012
             | 
            
                -0.10 / -1.92%
             |             
            
                5.30
             |           
            
                5.30
             |               
            
                5.00
             |                           
            
                5.10
             | 
            
                5.07
             |                     
            
                5.10
             |                                 
            
                144,100
             |            
            
                 
             |                                       
         
    
        
            | 
                3/9/2012
             | 
            
                -0.20 / -3.70%
             |             
            
                5.30
             |           
            
                5.50
             |               
            
                5.20
             |                           
            
                5.20
             | 
            
                5.31
             |                     
            
                5.20
             |                                 
            
                243,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/8/2012
             | 
            
                -0.40 / -6.90%
             |             
            
                5.40
             |           
            
                5.70
             |               
            
                5.40
             |                           
            
                5.40
             | 
            
                5.43
             |                     
            
                5.40
             |                                 
            
                164,200
             |            
            
                 
             |                                       
         
    
        
            | 
                3/7/2012
             | 
            
                -0.20 / -3.33%
             |             
            
                6.00
             |           
            
                6.00
             |               
            
                5.80
             |                           
            
                5.80
             | 
            
                5.81
             |                     
            
                5.80
             |                                 
            
                127,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/6/2012
             | 
            
                +0.10 / +1.69%
             |             
            
                6.30
             |           
            
                6.30
             |               
            
                5.90
             |                           
            
                6.00
             | 
            
                6.15
             |                     
            
                6.00
             |                                 
            
                468,000
             |            
            
                 
             |                                       
         
    
        
            | 
                3/5/2012
             | 
            
                +0.20 / +3.51%
             |             
            
                5.80
             |           
            
                5.90
             |               
            
                5.70
             |                           
            
                5.90
             | 
            
                5.88
             |                     
            
                5.90
             |                                 
            
                840,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/2/2012
             | 
            
                0.00 / 0.00%
             |             
            
                5.40
             |           
            
                5.70
             |               
            
                5.40
             |                           
            
                5.70
             | 
            
                5.64
             |                     
            
                5.70
             |                                 
            
                245,800
             |            
            
                 
             |                                       
         
    
        
            | 
                3/1/2012
             | 
            
                +0.10 / +1.79%
             |             
            
                5.70
             |           
            
                5.70
             |               
            
                5.30
             |                           
            
                5.70
             | 
            
                5.46
             |                     
            
                5.70
             |                                 
            
                54,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/29/2012
             | 
            
                0.00 / 0.00%
             |             
            
                5.50
             |           
            
                5.70
             |               
            
                5.40
             |                           
            
                5.60
             | 
            
                5.53
             |                     
            
                5.60
             |                                 
            
                75,800
             |            
            
                 
             |                                       
         
    
        
            | 
                2/28/2012
             | 
            
                -0.10 / -1.75%
             |             
            
                6.00
             |           
            
                6.00
             |               
            
                5.60
             |                           
            
                5.60
             | 
            
                5.82
             |                     
            
                5.60
             |                                 
            
                732,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/27/2012
             | 
            
                +0.10 / +1.79%
             |             
            
                5.70
             |           
            
                5.80
             |               
            
                5.60
             |                           
            
                5.70
             | 
            
                5.71
             |                     
            
                5.70
             |                                 
            
                830,300
             |            
            
                 
             |                                       
         
    
        
            | 
                2/24/2012
             | 
            
                0.00 / 0.00%
             |             
            
                5.60
             |           
            
                5.80
             |               
            
                5.50
             |                           
            
                5.60
             | 
            
                5.58
             |                     
            
                5.60
             |                                 
            
                258,200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/23/2012
             | 
            
                +0.10 / +1.82%
             |             
            
                5.50
             |           
            
                5.70
             |               
            
                5.40
             |                           
            
                5.60
             | 
            
                5.46
             |                     
            
                5.60
             |                                 
            
                220,000
             |            
            
                 
             |                                       
         
    
        
            | 
                2/22/2012
             | 
            
                +0.40 / +7.84%
             |             
            
                5.20
             |           
            
                5.50
             |               
            
                5.20
             |                           
            
                5.50
             | 
            
                5.37
             |                     
            
                5.50
             |                                 
            
                66,200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/21/2012
             | 
            
                -0.10 / -1.92%
             |             
            
                5.40
             |           
            
                5.40
             |               
            
                5.00
             |                           
            
                5.10
             | 
            
                5.21
             |                     
            
                5.10
             |                                 
            
                16,800
             |            
            
                 
             |                                       
         
    
        
            | 
                2/20/2012
             | 
            
                +0.30 / +6.12%
             |             
            
                5.00
             |           
            
                5.20
             |               
            
                5.00
             |                           
            
                5.20
             | 
            
                5.15
             |                     
            
                5.20
             |                                 
            
                52,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/17/2012
             | 
            
                +0.10 / +2.08%
             |             
            
                4.90
             |           
            
                5.00
             |               
            
                4.90
             |                           
            
                4.90
             | 
            
                4.90
             |                     
            
                4.90
             |                                 
            
                23,000
             |            
            
                 
             |                                       
         
    
        
            | 
                2/16/2012
             | 
            
                -0.20 / -4.00%
             |             
            
                4.80
             |           
            
                4.90
             |               
            
                4.80
             |                           
            
                4.80
             | 
            
                4.81
             |                     
            
                4.80
             |                                 
            
                25,200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/15/2012
             | 
            
                0.00 / 0.00%
             |             
            
                4.80
             |           
            
                5.00
             |               
            
                4.80
             |                           
            
                5.00
             | 
            
                4.80
             |                     
            
                5.00
             |                                 
            
                27,000
             |            
            
                 
             |                                       
         
    
        
            | 
                2/14/2012
             | 
            
                +0.10 / +2.04%
             |             
            
                5.00
             |           
            
                5.00
             |               
            
                5.00
             |                           
            
                5.00
             | 
            
                5.00
             |                     
            
                5.00
             |                                 
            
                300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/13/2012
             | 
            
                0.00 / 0.00%
             |             
            
                4.90
             |           
            
                4.90
             |               
            
                4.80
             |                           
            
                4.90
             | 
            
                4.84
             |                     
            
                4.90
             |                                 
            
                33,100
             |            
            
                 
             |                                       
         
    
        
            | 
                2/10/2012
             | 
            
                +0.10 / +2.08%
             |             
            
                4.90
             |           
            
                4.90
             |               
            
                4.90
             |                           
            
                4.90
             | 
            
                4.90
             |                     
            
                4.90
             |                                 
            
                0
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/9/2012
             | 
            
                -0.20 / -4.00%
             |             
            
                5.00
             |           
            
                5.00
             |               
            
                4.80
             |                           
            
                4.80
             | 
            
                4.88
             |                     
            
                4.80
             |                                 
            
                12,700
             |            
            
                 
             |                                       
         
    
        
            | 
                2/8/2012
             | 
            
                +0.10 / +2.04%
             |             
            
                5.00
             |           
            
                5.00
             |               
            
                5.00
             |                           
            
                5.00
             | 
            
                5.00
             |                     
            
                5.00
             |                                 
            
                15,300
             |  
            
                 
             |                                                              
             
    
         
    
    
 |