| 
                 
                    Closing price on 5/18/2012
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    36.20 | 
                 
                
                    | High | 
                    36.20 | 
                 
                
                    | Low | 
                    35.90 | 
                     
                
                    | Volume | 
                    15,260 | 
                                 
                
                    | Split-adjusted Price | 
                    3.81 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
IMP Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                5/18/2012
             | 
            
                -0.30 / -0.83%
             |             
            
                36.20
             |           
            
                36.20
             |               
            
                35.90
             |                           
            
                35.90
             | 
            
                35.90
             |                     
            
                3.81
             |                                 
            
                15,260
             |            
            
                 
             |                                       
         
    
        
            | 
                5/17/2012
             | 
            
                +0.10 / +0.28%
             |             
            
                36.00
             |           
            
                37.00
             |               
            
                36.00
             |                           
            
                36.20
             | 
            
                36.20
             |                     
            
                3.84
             |                                 
            
                3,560
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/16/2012
             | 
            
                -0.90 / -2.43%
             |             
            
                36.00
             |           
            
                37.00
             |               
            
                36.00
             |                           
            
                36.10
             | 
            
                36.10
             |                     
            
                3.83
             |                                 
            
                5,840
             |            
            
                 
             |                                       
         
    
        
            | 
                5/15/2012
             | 
            
                +0.10 / +0.27%
             |             
            
                35.20
             |           
            
                37.00
             |               
            
                35.20
             |                           
            
                37.00
             | 
            
                37.00
             |                     
            
                3.93
             |                                 
            
                7,820
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/14/2012
             | 
            
                -0.80 / -2.12%
             |             
            
                37.70
             |           
            
                37.70
             |               
            
                36.90
             |                           
            
                36.90
             | 
            
                36.90
             |                     
            
                3.91
             |                                 
            
                3,830
             |            
            
                 
             |                                       
         
    
        
            | 
                5/11/2012
             | 
            
                -0.20 / -0.53%
             |             
            
                37.00
             |           
            
                37.80
             |               
            
                37.00
             |                           
            
                37.70
             | 
            
                37.70
             |                     
            
                4.00
             |                                 
            
                4,650
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/10/2012
             | 
            
                0.00 / 0.00%
             |             
            
                38.00
             |           
            
                38.00
             |               
            
                37.20
             |                           
            
                37.90
             | 
            
                37.90
             |                     
            
                4.02
             |                                 
            
                18,190
             |            
            
                 
             |                                       
         
    
        
            | 
                5/9/2012
             | 
            
                +0.40 / +1.07%
             |             
            
                37.80
             |           
            
                38.90
             |               
            
                37.80
             |                           
            
                37.90
             | 
            
                37.90
             |                     
            
                4.02
             |                                 
            
                10,280
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/8/2012
             | 
            
                +0.10 / +0.27%
             |             
            
                37.20
             |           
            
                37.80
             |               
            
                37.20
             |                           
            
                37.50
             | 
            
                37.50
             |                     
            
                3.98
             |                                 
            
                15,560
             |            
            
                 
             |                                       
         
    
        
            | 
                5/7/2012
             | 
            
                +0.30 / +0.81%
             |             
            
                37.00
             |           
            
                37.40
             |               
            
                37.00
             |                           
            
                37.40
             | 
            
                37.40
             |                     
            
                3.97
             |                                 
            
                14,720
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/4/2012
             | 
            
                -0.10 / -0.27%
             |             
            
                37.00
             |           
            
                37.20
             |               
            
                36.60
             |                           
            
                37.10
             | 
            
                37.10
             |                     
            
                3.94
             |                                 
            
                19,730
             |            
            
                 
             |                                       
         
    
        
            | 
                5/3/2012
             | 
            
                +0.20 / +0.54%
             |             
            
                37.30
             |           
            
                37.30
             |               
            
                37.20
             |                           
            
                37.20
             | 
            
                37.20
             |                     
            
                3.95
             |                                 
            
                890
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/2/2012
             | 
            
                -0.80 / -2.12%
             |             
            
                37.20
             |           
            
                37.20
             |               
            
                37.00
             |                           
            
                37.00
             | 
            
                37.00
             |                     
            
                3.93
             |                                 
            
                5,080
             |            
            
                 
             |                                       
         
    
        
            | 
                4/27/2012
             | 
            
                -0.10 / -0.26%
             |             
            
                37.60
             |           
            
                37.80
             |               
            
                37.60
             |                           
            
                37.80
             | 
            
                37.80
             |                     
            
                4.01
             |                                 
            
                10,740
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/26/2012
             | 
            
                0.00 / 0.00%
             |             
            
                37.50
             |           
            
                37.90
             |               
            
                37.10
             |                           
            
                37.90
             | 
            
                37.90
             |                     
            
                4.02
             |                                 
            
                15,700
             |            
            
                 
             |                                       
         
    
        
            | 
                4/25/2012
             | 
            
                -1.20 / -3.07%
             |             
            
                36.90
             |           
            
                37.90
             |               
            
                36.90
             |                           
            
                37.90
             | 
            
                37.90
             |                     
            
                4.02
             |                                 
            
                9,050
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/24/2012
             | 
            
                -0.30 / -0.76%
             |             
            
                39.40
             |           
            
                39.40
             |               
            
                38.50
             |                           
            
                39.10
             | 
            
                39.10
             |                     
            
                3.91
             |                                 
            
                19,900
             |            
            
                 
             |                                       
         
    
        
            | 
                4/23/2012
             | 
            
                +0.20 / +0.51%
             |             
            
                39.40
             |           
            
                39.40
             |               
            
                39.20
             |                           
            
                39.40
             | 
            
                39.40
             |                     
            
                3.94
             |                                 
            
                12,780
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/20/2012
             | 
            
                0.00 / 0.00%
             |             
            
                38.90
             |           
            
                39.20
             |               
            
                38.70
             |                           
            
                39.20
             | 
            
                39.20
             |                     
            
                3.92
             |                                 
            
                17,550
             |            
            
                 
             |                                       
         
    
        
            | 
                4/19/2012
             | 
            
                +1.70 / +4.53%
             |             
            
                38.70
             |           
            
                39.30
             |               
            
                38.30
             |                           
            
                39.20
             | 
            
                39.20
             |                     
            
                3.92
             |                                 
            
                13,670
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/18/2012
             | 
            
                -1.30 / -3.35%
             |             
            
                39.70
             |           
            
                39.70
             |               
            
                37.50
             |                           
            
                37.50
             | 
            
                37.50
             |                     
            
                3.75
             |                                 
            
                59,800
             |            
            
                 
             |                                       
         
    
        
            | 
                4/17/2012
             | 
            
                +0.10 / +0.26%
             |             
            
                38.70
             |           
            
                40.00
             |               
            
                38.70
             |                           
            
                38.80
             | 
            
                38.80
             |                     
            
                3.88
             |                                 
            
                46,110
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/16/2012
             | 
            
                +1.80 / +4.88%
             |             
            
                38.00
             |           
            
                38.70
             |               
            
                36.50
             |                           
            
                38.70
             | 
            
                38.70
             |                     
            
                3.87
             |                                 
            
                21,440
             |            
            
                 
             |                                       
         
    
        
            | 
                4/13/2012
             | 
            
                -0.90 / -2.38%
             |             
            
                37.90
             |           
            
                37.90
             |               
            
                36.90
             |                           
            
                36.90
             | 
            
                36.90
             |                     
            
                3.69
             |                                 
            
                110,030
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/12/2012
             | 
            
                -0.20 / -0.53%
             |             
            
                37.00
             |           
            
                38.00
             |               
            
                37.00
             |                           
            
                37.80
             | 
            
                37.80
             |                     
            
                3.78
             |                                 
            
                18,380
             |            
            
                 
             |                                       
         
    
        
            | 
                4/11/2012
             | 
            
                0.00 / 0.00%
             |             
            
                37.10
             |           
            
                38.00
             |               
            
                37.00
             |                           
            
                38.00
             | 
            
                38.00
             |                     
            
                3.80
             |                                 
            
                22,580
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/10/2012
             | 
            
                +0.30 / +0.80%
             |             
            
                37.10
             |           
            
                38.00
             |               
            
                37.00
             |                           
            
                38.00
             | 
            
                38.00
             |                     
            
                3.80
             |                                 
            
                7,260
             |            
            
                 
             |                                       
         
    
        
            | 
                4/9/2012
             | 
            
                +0.40 / +1.07%
             |             
            
                37.00
             |           
            
                37.70
             |               
            
                37.00
             |                           
            
                37.70
             | 
            
                37.70
             |                     
            
                3.77
             |                                 
            
                8,950
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/6/2012
             | 
            
                -0.20 / -0.53%
             |             
            
                38.00
             |           
            
                38.00
             |               
            
                36.50
             |                           
            
                37.30
             | 
            
                37.30
             |                     
            
                3.73
             |                                 
            
                12,260
             |            
            
                 
             |                                       
         
    
        
            | 
                4/5/2012
             | 
            
                0.00 / 0.00%
             |             
            
                38.00
             |           
            
                38.00
             |               
            
                36.70
             |                           
            
                37.50
             | 
            
                37.50
             |                     
            
                3.75
             |                                 
            
                2,810
             |  
            
                 
             |                                                              
             
    
         
    
    
 |