| 
                 
                    Closing price on 7/19/2011
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    46.10 | 
                 
                
                    | High | 
                    46.10 | 
                 
                
                    | Low | 
                    46.10 | 
                     
                
                    | Volume | 
                    100 | 
                                 
                
                    | Split-adjusted Price | 
                    4.62 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
IMP Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                7/19/2011
             | 
            
                -1.90 / -3.96%
             |             
            
                46.10
             |           
            
                46.10
             |               
            
                46.10
             |                           
            
                46.10
             | 
            
                46.10
             |                     
            
                4.62
             |                                 
            
                100
             |            
            
                 
             |                                       
         
    
        
            | 
                7/18/2011
             | 
            
                0.00 / 0.00%
             |             
            
                48.00
             |           
            
                48.00
             |               
            
                48.00
             |                           
            
                48.00
             | 
            
                48.00
             |                     
            
                4.81
             |                                 
            
                0
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/15/2011
             | 
            
                0.00 / 0.00%
             |             
            
                48.00
             |           
            
                48.00
             |               
            
                48.00
             |                           
            
                48.00
             | 
            
                48.00
             |                     
            
                4.81
             |                                 
            
                30
             |            
            
                 
             |                                       
         
    
        
            | 
                7/14/2011
             | 
            
                +1.50 / +3.23%
             |             
            
                47.80
             |           
            
                48.00
             |               
            
                47.80
             |                           
            
                48.00
             | 
            
                48.00
             |                     
            
                4.81
             |                                 
            
                60,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/13/2011
             | 
            
                +1.50 / +3.33%
             |             
            
                45.00
             |           
            
                46.50
             |               
            
                45.00
             |                           
            
                46.50
             | 
            
                46.50
             |                     
            
                4.66
             |                                 
            
                6,430
             |            
            
                 
             |                                       
         
    
        
            | 
                7/12/2011
             | 
            
                +2.00 / +4.65%
             |             
            
                43.00
             |           
            
                45.00
             |               
            
                43.00
             |                           
            
                45.00
             | 
            
                45.00
             |                     
            
                4.51
             |                                 
            
                172,614
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/11/2011
             | 
            
                +0.50 / +1.18%
             |             
            
                43.00
             |           
            
                43.00
             |               
            
                43.00
             |                           
            
                43.00
             | 
            
                43.00
             |                     
            
                4.31
             |                                 
            
                500
             |            
            
                 
             |                                       
         
    
        
            | 
                7/8/2011
             | 
            
                +0.50 / +1.19%
             |             
            
                42.00
             |           
            
                42.50
             |               
            
                42.00
             |                           
            
                42.50
             | 
            
                42.50
             |                     
            
                4.26
             |                                 
            
                28,460
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/7/2011
             | 
            
                0.00 / 0.00%
             |             
            
                42.00
             |           
            
                42.00
             |               
            
                42.00
             |                           
            
                42.00
             | 
            
                42.00
             |                     
            
                4.21
             |                                 
            
                190,000
             |            
            
                 
             |                                       
         
    
        
            | 
                7/6/2011
             | 
            
                0.00 / 0.00%
             |             
            
                42.00
             |           
            
                42.00
             |               
            
                42.00
             |                           
            
                42.00
             | 
            
                42.00
             |                     
            
                4.21
             |                                 
            
                5,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/5/2011
             | 
            
                0.00 / 0.00%
             |             
            
                41.00
             |           
            
                42.00
             |               
            
                41.00
             |                           
            
                42.00
             | 
            
                42.00
             |                     
            
                4.21
             |                                 
            
                15,000
             |            
            
                 
             |                                       
         
    
        
            | 
                7/4/2011
             | 
            
                +1.00 / +2.44%
             |             
            
                40.00
             |           
            
                42.00
             |               
            
                40.00
             |                           
            
                42.00
             | 
            
                42.00
             |                     
            
                4.21
             |                                 
            
                250
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/1/2011
             | 
            
                0.00 / 0.00%
             |             
            
                41.00
             |           
            
                41.50
             |               
            
                41.00
             |                           
            
                41.00
             | 
            
                41.00
             |                     
            
                4.11
             |                                 
            
                5,500
             |            
            
                 
             |                                       
         
    
        
            | 
                6/30/2011
             | 
            
                -1.00 / -2.38%
             |             
            
                42.50
             |           
            
                42.50
             |               
            
                41.00
             |                           
            
                41.00
             | 
            
                41.00
             |                     
            
                4.11
             |                                 
            
                310
             |  
            
                 
             |                                                              
             
    
        			
            | 
                6/29/2011
             | 
            
                0.00 / 0.00%
             |             
            
                42.00
             |           
            
                42.00
             |               
            
                42.00
             |                           
            
                42.00
             | 
            
                42.00
             |                     
            
                4.21
             |                                 
            
                0
             |            
            
                 
             |                                       
         
    
        
            | 
                6/28/2011
             | 
            
                0.00 / 0.00%
             |             
            
                42.00
             |           
            
                42.00
             |               
            
                42.00
             |                           
            
                42.00
             | 
            
                42.00
             |                     
            
                4.21
             |                                 
            
                0
             |  
            
                 
             |                                                              
             
    
        			
            | 
                6/27/2011
             | 
            
                0.00 / 0.00%
             |             
            
                42.00
             |           
            
                42.00
             |               
            
                42.00
             |                           
            
                42.00
             | 
            
                42.00
             |                     
            
                4.21
             |                                 
            
                30
             |            
            
                 
             |                                       
         
    
        
            | 
                6/24/2011
             | 
            
                0.00 / 0.00%
             |             
            
                44.00
             |           
            
                44.00
             |               
            
                42.00
             |                           
            
                42.00
             | 
            
                42.00
             |                     
            
                4.21
             |                                 
            
                17,710
             |  
            
                 
             |                                                              
             
    
        			
            | 
                6/23/2011
             | 
            
                0.00 / 0.00%
             |             
            
                42.00
             |           
            
                42.00
             |               
            
                42.00
             |                           
            
                42.00
             | 
            
                42.00
             |                     
            
                4.21
             |                                 
            
                0
             |            
            
                 
             |                                       
         
    
        
            | 
                6/22/2011
             | 
            
                +2.00 / +5.00%
             |             
            
                42.00
             |           
            
                42.00
             |               
            
                42.00
             |                           
            
                42.00
             | 
            
                42.00
             |                     
            
                4.21
             |                                 
            
                100,010
             |  
            
                 
             |                                                              
             
    
        			
            | 
                6/21/2011
             | 
            
                -2.00 / -4.76%
             |             
            
                42.00
             |           
            
                42.00
             |               
            
                40.00
             |                           
            
                40.00
             | 
            
                40.00
             |                     
            
                4.01
             |                                 
            
                990
             |            
            
                 
             |                                       
         
    
        
            | 
                6/20/2011
             | 
            
                0.00 / 0.00%
             |             
            
                42.00
             |           
            
                42.00
             |               
            
                42.00
             |                           
            
                42.00
             | 
            
                42.00
             |                     
            
                4.21
             |                                 
            
                220
             |  
            
                 
             |                                                              
             
    
        			
            | 
                6/17/2011
             | 
            
                0.00 / 0.00%
             |             
            
                42.00
             |           
            
                42.00
             |               
            
                42.00
             |                           
            
                42.00
             | 
            
                42.00
             |                     
            
                4.21
             |                                 
            
                0
             |            
            
                 
             |                                       
         
    
        
            | 
                6/16/2011
             | 
            
                0.00 / 0.00%
             |             
            
                42.00
             |           
            
                42.00
             |               
            
                42.00
             |                           
            
                42.00
             | 
            
                42.00
             |                     
            
                4.21
             |                                 
            
                0
             |  
            
                 
             |                                                              
             
    
        			
            | 
                6/15/2011
             | 
            
                0.00 / 0.00%
             |             
            
                42.00
             |           
            
                42.00
             |               
            
                42.00
             |                           
            
                42.00
             | 
            
                42.00
             |                     
            
                4.21
             |                                 
            
                120
             |            
            
                 
             |                                       
         
    
        
            | 
                6/14/2011
             | 
            
                0.00 / 0.00%
             |             
            
                41.30
             |           
            
                42.00
             |               
            
                41.30
             |                           
            
                42.00
             | 
            
                42.00
             |                     
            
                4.21
             |                                 
            
                250
             |  
            
                 
             |                                                              
             
    
        			
            | 
                6/13/2011
             | 
            
                0.00 / 0.00%
             |             
            
                42.00
             |           
            
                42.00
             |               
            
                42.00
             |                           
            
                42.00
             | 
            
                42.00
             |                     
            
                4.21
             |                                 
            
                13,000
             |            
            
                 
             |                                       
         
    
        
            | 
                6/10/2011
             | 
            
                0.00 / 0.00%
             |             
            
                42.00
             |           
            
                42.00
             |               
            
                42.00
             |                           
            
                42.00
             | 
            
                42.00
             |                     
            
                4.21
             |                                 
            
                13,310
             |  
            
                 
             |                                                              
             
    
        			
            | 
                6/9/2011
             | 
            
                +0.50 / +1.20%
             |             
            
                41.50
             |           
            
                42.00
             |               
            
                41.50
             |                           
            
                42.00
             | 
            
                42.00
             |                     
            
                4.21
             |                                 
            
                15,140
             |            
            
                 
             |                                       
         
    
        
            | 
                6/8/2011
             | 
            
                0.00 / 0.00%
             |             
            
                41.50
             |           
            
                42.00
             |               
            
                40.00
             |                           
            
                41.50
             | 
            
                41.50
             |                     
            
                4.16
             |                                 
            
                20,540
             |  
            
                 
             |                                                              
             
    
         
    
    
 |