| 
                 
                    Closing price on 2/23/2012
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    40.50 | 
                 
                
                    | High | 
                    41.80 | 
                 
                
                    | Low | 
                    40.00 | 
                     
                
                    | Volume | 
                    6,100 | 
                                 
                
                    | Split-adjusted Price | 
                    4.19 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
IMP Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                2/23/2012
             | 
            
                -0.20 / -0.48%
             |             
            
                40.50
             |           
            
                41.80
             |               
            
                40.00
             |                           
            
                41.80
             | 
            
                41.80
             |                     
            
                4.19
             |                                 
            
                6,100
             |            
            
                 
             |                                       
         
    
        
            | 
                2/22/2012
             | 
            
                0.00 / 0.00%
             |             
            
                42.00
             |           
            
                42.00
             |               
            
                41.90
             |                           
            
                42.00
             | 
            
                42.00
             |                     
            
                4.21
             |                                 
            
                10,720
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/21/2012
             | 
            
                +0.10 / +0.24%
             |             
            
                42.00
             |           
            
                42.00
             |               
            
                42.00
             |                           
            
                42.00
             | 
            
                42.00
             |                     
            
                4.21
             |                                 
            
                7,050
             |            
            
                 
             |                                       
         
    
        
            | 
                2/20/2012
             | 
            
                +0.90 / +2.20%
             |             
            
                41.90
             |           
            
                41.90
             |               
            
                40.00
             |                           
            
                41.90
             | 
            
                41.90
             |                     
            
                4.20
             |                                 
            
                16,540
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/17/2012
             | 
            
                -1.00 / -2.38%
             |             
            
                42.00
             |           
            
                42.00
             |               
            
                39.90
             |                           
            
                41.00
             | 
            
                41.00
             |                     
            
                4.11
             |                                 
            
                57,280
             |            
            
                 
             |                                       
         
    
        
            | 
                2/16/2012
             | 
            
                +1.90 / +4.74%
             |             
            
                40.10
             |           
            
                42.00
             |               
            
                40.10
             |                           
            
                42.00
             | 
            
                42.00
             |                     
            
                4.21
             |                                 
            
                970
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/15/2012
             | 
            
                -2.10 / -4.98%
             |             
            
                42.20
             |           
            
                42.20
             |               
            
                40.10
             |                           
            
                40.10
             | 
            
                40.10
             |                     
            
                4.02
             |                                 
            
                63,760
             |            
            
                 
             |                                       
         
    
        
            | 
                2/14/2012
             | 
            
                -0.80 / -1.86%
             |             
            
                42.50
             |           
            
                42.50
             |               
            
                42.20
             |                           
            
                42.20
             | 
            
                42.20
             |                     
            
                4.23
             |                                 
            
                1,650
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/13/2012
             | 
            
                0.00 / 0.00%
             |             
            
                41.20
             |           
            
                43.00
             |               
            
                41.00
             |                           
            
                43.00
             | 
            
                43.00
             |                     
            
                4.31
             |                                 
            
                8,800
             |            
            
                 
             |                                       
         
    
        
            | 
                2/10/2012
             | 
            
                -0.50 / -1.15%
             |             
            
                42.00
             |           
            
                43.40
             |               
            
                42.00
             |                           
            
                43.00
             | 
            
                43.00
             |                     
            
                4.31
             |                                 
            
                5,560
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/9/2012
             | 
            
                +0.30 / +0.69%
             |             
            
                42.00
             |           
            
                43.50
             |               
            
                42.00
             |                           
            
                43.50
             | 
            
                43.50
             |                     
            
                4.36
             |                                 
            
                6,000
             |            
            
                 
             |                                       
         
    
        
            | 
                2/8/2012
             | 
            
                +0.20 / +0.47%
             |             
            
                42.00
             |           
            
                43.20
             |               
            
                42.00
             |                           
            
                43.20
             | 
            
                43.20
             |                     
            
                4.33
             |                                 
            
                3,510
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/7/2012
             | 
            
                0.00 / 0.00%
             |             
            
                42.00
             |           
            
                43.00
             |               
            
                42.00
             |                           
            
                43.00
             | 
            
                43.00
             |                     
            
                4.31
             |                                 
            
                2,500
             |            
            
                 
             |                                       
         
    
        
            | 
                2/6/2012
             | 
            
                0.00 / 0.00%
             |             
            
                43.00
             |           
            
                43.00
             |               
            
                43.00
             |                           
            
                43.00
             | 
            
                43.00
             |                     
            
                4.31
             |                                 
            
                1,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/3/2012
             | 
            
                0.00 / 0.00%
             |             
            
                43.00
             |           
            
                43.00
             |               
            
                43.00
             |                           
            
                43.00
             | 
            
                43.00
             |                     
            
                4.31
             |                                 
            
                1,300
             |            
            
                 
             |                                       
         
    
        
            | 
                2/2/2012
             | 
            
                0.00 / 0.00%
             |             
            
                43.00
             |           
            
                43.00
             |               
            
                43.00
             |                           
            
                43.00
             | 
            
                43.00
             |                     
            
                4.31
             |                                 
            
                3,010
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/1/2012
             | 
            
                +0.70 / +1.65%
             |             
            
                43.00
             |           
            
                43.00
             |               
            
                43.00
             |                           
            
                43.00
             | 
            
                43.00
             |                     
            
                4.31
             |                                 
            
                1,340
             |            
            
                 
             |                                       
         
    
        
            | 
                1/31/2012
             | 
            
                -1.20 / -2.76%
             |             
            
                42.50
             |           
            
                42.50
             |               
            
                41.50
             |                           
            
                42.30
             | 
            
                42.30
             |                     
            
                4.24
             |                                 
            
                35,770
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/30/2012
             | 
            
                +2.00 / +4.82%
             |             
            
                43.50
             |           
            
                43.50
             |               
            
                43.50
             |                           
            
                43.50
             | 
            
                43.50
             |                     
            
                4.36
             |                                 
            
                10
             |            
            
                 
             |                                       
         
    
        
            | 
                1/20/2012
             | 
            
                -0.50 / -1.19%
             |             
            
                42.00
             |           
            
                42.00
             |               
            
                41.50
             |                           
            
                41.50
             | 
            
                41.50
             |                     
            
                4.16
             |                                 
            
                21,420
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/19/2012
             | 
            
                0.00 / 0.00%
             |             
            
                42.00
             |           
            
                42.00
             |               
            
                42.00
             |                           
            
                42.00
             | 
            
                42.00
             |                     
            
                4.21
             |                                 
            
                41,000
             |            
            
                 
             |                                       
         
    
        
            | 
                1/18/2012
             | 
            
                +0.20 / +0.48%
             |             
            
                41.80
             |           
            
                43.00
             |               
            
                41.80
             |                           
            
                42.00
             | 
            
                42.00
             |                     
            
                4.21
             |                                 
            
                38,630
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/17/2012
             | 
            
                0.00 / 0.00%
             |             
            
                41.80
             |           
            
                41.80
             |               
            
                41.80
             |                           
            
                41.80
             | 
            
                41.80
             |                     
            
                4.19
             |                                 
            
                0
             |            
            
                 
             |                                       
         
    
        
            | 
                1/16/2012
             | 
            
                +1.90 / +4.76%
             |             
            
                41.80
             |           
            
                41.80
             |               
            
                41.80
             |                           
            
                41.80
             | 
            
                41.80
             |                     
            
                4.19
             |                                 
            
                10
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/13/2012
             | 
            
                +1.90 / +5.00%
             |             
            
                39.90
             |           
            
                39.90
             |               
            
                39.90
             |                           
            
                39.90
             | 
            
                39.90
             |                     
            
                3.99
             |                                 
            
                10
             |            
            
                 
             |                                       
         
    
        
            | 
                1/12/2012
             | 
            
                -2.00 / -5.00%
             |             
            
                38.00
             |           
            
                38.00
             |               
            
                38.00
             |                           
            
                38.00
             | 
            
                38.00
             |                     
            
                3.80
             |                                 
            
                4,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/11/2012
             | 
            
                -1.90 / -4.53%
             |             
            
                41.90
             |           
            
                41.90
             |               
            
                40.00
             |                           
            
                40.00
             | 
            
                40.00
             |                     
            
                4.01
             |                                 
            
                10,500
             |            
            
                 
             |                                       
         
    
        
            | 
                1/10/2012
             | 
            
                -0.10 / -0.24%
             |             
            
                41.90
             |           
            
                41.90
             |               
            
                41.90
             |                           
            
                41.90
             | 
            
                41.90
             |                     
            
                4.20
             |                                 
            
                12,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/9/2012
             | 
            
                0.00 / 0.00%
             |             
            
                40.00
             |           
            
                42.00
             |               
            
                40.00
             |                           
            
                42.00
             | 
            
                42.00
             |                     
            
                4.21
             |                                 
            
                2,120
             |            
            
                 
             |                                       
         
    
        
            | 
                1/6/2012
             | 
            
                -0.50 / -1.18%
             |             
            
                42.40
             |           
            
                42.40
             |               
            
                42.00
             |                           
            
                42.00
             | 
            
                42.00
             |                     
            
                4.21
             |                                 
            
                3,000
             |  
            
                 
             |                                                              
             
    
         
    
    
 |