| 
                 
                    Closing price on 3/23/2012
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    40.20 | 
                 
                
                    | High | 
                    40.20 | 
                 
                
                    | Low | 
                    38.30 | 
                     
                
                    | Volume | 
                    12,130 | 
                                 
                
                    | Split-adjusted Price | 
                    3.83 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
IMP Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                3/23/2012
             | 
            
                0.00 / 0.00%
             |             
            
                40.20
             |           
            
                40.20
             |               
            
                38.30
             |                           
            
                38.30
             | 
            
                38.30
             |                     
            
                3.83
             |                                 
            
                12,130
             |            
            
                 
             |                                       
         
    
        
            | 
                3/22/2012
             | 
            
                0.00 / 0.00%
             |             
            
                38.70
             |           
            
                38.70
             |               
            
                38.30
             |                           
            
                38.30
             | 
            
                38.30
             |                     
            
                3.83
             |                                 
            
                2,660
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/21/2012
             | 
            
                0.00 / 0.00%
             |             
            
                38.90
             |           
            
                39.00
             |               
            
                38.30
             |                           
            
                38.30
             | 
            
                38.30
             |                     
            
                3.83
             |                                 
            
                12,870
             |            
            
                 
             |                                       
         
    
        
            | 
                3/20/2012
             | 
            
                -0.70 / -1.79%
             |             
            
                38.20
             |           
            
                38.30
             |               
            
                38.00
             |                           
            
                38.30
             | 
            
                38.30
             |                     
            
                3.83
             |                                 
            
                44,820
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/19/2012
             | 
            
                -1.00 / -2.50%
             |             
            
                39.50
             |           
            
                39.50
             |               
            
                39.00
             |                           
            
                39.00
             | 
            
                39.00
             |                     
            
                3.90
             |                                 
            
                5,550
             |            
            
                 
             |                                       
         
    
        
            | 
                3/16/2012
             | 
            
                0.00 / 0.00%
             |             
            
                39.90
             |           
            
                40.00
             |               
            
                38.60
             |                           
            
                40.00
             | 
            
                40.00
             |                     
            
                4.01
             |                                 
            
                270
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/15/2012
             | 
            
                0.00 / 0.00%
             |             
            
                38.40
             |           
            
                40.00
             |               
            
                38.40
             |                           
            
                40.00
             | 
            
                40.00
             |                     
            
                4.01
             |                                 
            
                1,000
             |            
            
                 
             |                                       
         
    
        
            | 
                3/14/2012
             | 
            
                +0.90 / +2.30%
             |             
            
                40.00
             |           
            
                40.00
             |               
            
                40.00
             |                           
            
                40.00
             | 
            
                40.00
             |                     
            
                4.01
             |                                 
            
                230
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/13/2012
             | 
            
                -1.40 / -3.46%
             |             
            
                39.00
             |           
            
                40.20
             |               
            
                39.00
             |                           
            
                39.10
             | 
            
                39.10
             |                     
            
                3.91
             |                                 
            
                940
             |            
            
                 
             |                                       
         
    
        
            | 
                3/12/2012
             | 
            
                0.00 / 0.00%
             |             
            
                38.60
             |           
            
                40.50
             |               
            
                38.60
             |                           
            
                40.50
             | 
            
                40.50
             |                     
            
                4.06
             |                                 
            
                5,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/9/2012
             | 
            
                -0.50 / -1.22%
             |             
            
                40.00
             |           
            
                40.70
             |               
            
                39.50
             |                           
            
                40.50
             | 
            
                40.50
             |                     
            
                4.06
             |                                 
            
                3,960
             |            
            
                 
             |                                       
         
    
        
            | 
                3/8/2012
             | 
            
                0.00 / 0.00%
             |             
            
                41.00
             |           
            
                41.00
             |               
            
                41.00
             |                           
            
                41.00
             | 
            
                41.00
             |                     
            
                4.11
             |                                 
            
                0
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/7/2012
             | 
            
                +0.20 / +0.49%
             |             
            
                40.80
             |           
            
                41.00
             |               
            
                39.70
             |                           
            
                41.00
             | 
            
                41.00
             |                     
            
                4.11
             |                                 
            
                2,530
             |            
            
                 
             |                                       
         
    
        
            | 
                3/6/2012
             | 
            
                0.00 / 0.00%
             |             
            
                40.50
             |           
            
                40.80
             |               
            
                40.50
             |                           
            
                40.80
             | 
            
                40.80
             |                     
            
                4.09
             |                                 
            
                570
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/5/2012
             | 
            
                +0.40 / +0.99%
             |             
            
                40.40
             |           
            
                40.90
             |               
            
                40.40
             |                           
            
                40.80
             | 
            
                40.80
             |                     
            
                4.09
             |                                 
            
                21,300
             |            
            
                 
             |                                       
         
    
        
            | 
                3/2/2012
             | 
            
                -0.10 / -0.25%
             |             
            
                40.50
             |           
            
                41.00
             |               
            
                40.40
             |                           
            
                40.40
             | 
            
                40.40
             |                     
            
                4.05
             |                                 
            
                4,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/1/2012
             | 
            
                -0.40 / -0.98%
             |             
            
                40.00
             |           
            
                40.50
             |               
            
                40.00
             |                           
            
                40.50
             | 
            
                40.50
             |                     
            
                4.06
             |                                 
            
                5,390
             |            
            
                 
             |                                       
         
    
        
            | 
                2/29/2012
             | 
            
                0.00 / 0.00%
             |             
            
                40.90
             |           
            
                40.90
             |               
            
                40.00
             |                           
            
                40.90
             | 
            
                40.90
             |                     
            
                4.10
             |                                 
            
                5,750
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/28/2012
             | 
            
                -1.10 / -2.62%
             |             
            
                41.00
             |           
            
                41.50
             |               
            
                40.00
             |                           
            
                40.90
             | 
            
                40.90
             |                     
            
                4.10
             |                                 
            
                4,930
             |            
            
                 
             |                                       
         
    
        
            | 
                2/27/2012
             | 
            
                -0.10 / -0.24%
             |             
            
                43.10
             |           
            
                43.10
             |               
            
                42.00
             |                           
            
                42.00
             | 
            
                42.00
             |                     
            
                4.21
             |                                 
            
                2,560
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/24/2012
             | 
            
                +0.30 / +0.72%
             |             
            
                43.70
             |           
            
                43.70
             |               
            
                42.10
             |                           
            
                42.10
             | 
            
                42.10
             |                     
            
                4.22
             |                                 
            
                4,770
             |            
            
                 
             |                                       
         
    
        
            | 
                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
             |  
            
                 
             |                                                              
             
    
         
    
    
 |