| 
                 
                    Closing price on 9/13/2012
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    39.00 | 
                 
                
                    | High | 
                    39.30 | 
                 
                
                    | Low | 
                    38.00 | 
                     
                
                    | Volume | 
                    21,940 | 
                                 
                
                    | Split-adjusted Price | 
                    4.17 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
IMP Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                9/13/2012
             | 
            
                +1.80 / +4.80%
             |             
            
                39.00
             |           
            
                39.30
             |               
            
                38.00
             |                           
            
                39.30
             | 
            
                39.30
             |                     
            
                4.17
             |                                 
            
                21,940
             |            
            
                 
             |                                       
         
    
        
            | 
                9/12/2012
             | 
            
                0.00 / 0.00%
             |             
            
                37.50
             |           
            
                37.50
             |               
            
                37.50
             |                           
            
                37.50
             | 
            
                37.50
             |                     
            
                3.98
             |                                 
            
                0
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/11/2012
             | 
            
                -0.50 / -1.32%
             |             
            
                37.50
             |           
            
                37.50
             |               
            
                37.50
             |                           
            
                37.50
             | 
            
                37.50
             |                     
            
                3.98
             |                                 
            
                7,900
             |            
            
                 
             |                                       
         
    
        
            | 
                9/10/2012
             | 
            
                0.00 / 0.00%
             |             
            
                36.20
             |           
            
                38.00
             |               
            
                36.10
             |                           
            
                38.00
             | 
            
                38.00
             |                     
            
                4.03
             |                                 
            
                1,610
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/7/2012
             | 
            
                0.00 / 0.00%
             |             
            
                38.50
             |           
            
                38.50
             |               
            
                36.50
             |                           
            
                38.00
             | 
            
                38.00
             |                     
            
                4.03
             |                                 
            
                2,880
             |            
            
                 
             |                                       
         
    
        
            | 
                9/6/2012
             | 
            
                0.00 / 0.00%
             |             
            
                38.00
             |           
            
                38.00
             |               
            
                38.00
             |                           
            
                38.00
             | 
            
                38.00
             |                     
            
                4.03
             |                                 
            
                0
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/5/2012
             | 
            
                0.00 / 0.00%
             |             
            
                38.00
             |           
            
                38.00
             |               
            
                36.50
             |                           
            
                38.00
             | 
            
                38.00
             |                     
            
                4.03
             |                                 
            
                4,430
             |            
            
                 
             |                                       
         
    
        
            | 
                9/4/2012
             | 
            
                0.00 / 0.00%
             |             
            
                38.00
             |           
            
                38.00
             |               
            
                36.10
             |                           
            
                38.00
             | 
            
                38.00
             |                     
            
                4.03
             |                                 
            
                4,910
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/31/2012
             | 
            
                0.00 / 0.00%
             |             
            
                38.50
             |           
            
                38.50
             |               
            
                38.00
             |                           
            
                38.00
             | 
            
                38.00
             |                     
            
                4.03
             |                                 
            
                3,150
             |            
            
                 
             |                                       
         
    
        
            | 
                8/30/2012
             | 
            
                0.00 / 0.00%
             |             
            
                38.00
             |           
            
                38.00
             |               
            
                38.00
             |                           
            
                38.00
             | 
            
                38.00
             |                     
            
                4.03
             |                                 
            
                20,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/29/2012
             | 
            
                +0.10 / +0.26%
             |             
            
                38.00
             |           
            
                38.00
             |               
            
                38.00
             |                           
            
                38.00
             | 
            
                38.00
             |                     
            
                4.03
             |                                 
            
                400
             |            
            
                 
             |                                       
         
    
        
            | 
                8/28/2012
             | 
            
                -0.10 / -0.26%
             |             
            
                38.00
             |           
            
                38.00
             |               
            
                37.90
             |                           
            
                37.90
             | 
            
                37.90
             |                     
            
                4.02
             |                                 
            
                14,310
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/27/2012
             | 
            
                -2.00 / -5.00%
             |             
            
                39.50
             |           
            
                39.50
             |               
            
                38.00
             |                           
            
                38.00
             | 
            
                38.00
             |                     
            
                4.03
             |                                 
            
                13,850
             |            
            
                 
             |                                       
         
    
        
            | 
                8/24/2012
             | 
            
                +1.00 / +2.56%
             |             
            
                40.00
             |           
            
                40.00
             |               
            
                40.00
             |                           
            
                40.00
             | 
            
                40.00
             |                     
            
                4.24
             |                                 
            
                10
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/23/2012
             | 
            
                -0.80 / -2.01%
             |             
            
                39.80
             |           
            
                39.80
             |               
            
                38.00
             |                           
            
                39.00
             | 
            
                39.00
             |                     
            
                4.14
             |                                 
            
                160
             |            
            
                 
             |                                       
         
    
        
            | 
                8/22/2012
             | 
            
                -0.50 / -1.24%
             |             
            
                40.30
             |           
            
                40.30
             |               
            
                39.80
             |                           
            
                39.80
             | 
            
                39.80
             |                     
            
                4.22
             |                                 
            
                160
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/21/2012
             | 
            
                +1.30 / +3.33%
             |             
            
                37.60
             |           
            
                40.30
             |               
            
                37.60
             |                           
            
                40.30
             | 
            
                40.30
             |                     
            
                4.28
             |                                 
            
                370
             |            
            
                 
             |                                       
         
    
        
            | 
                8/20/2012
             | 
            
                0.00 / 0.00%
             |             
            
                39.50
             |           
            
                39.50
             |               
            
                39.00
             |                           
            
                39.00
             | 
            
                39.00
             |                     
            
                4.14
             |                                 
            
                10,600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/17/2012
             | 
            
                0.00 / 0.00%
             |             
            
                39.00
             |           
            
                39.00
             |               
            
                39.00
             |                           
            
                39.00
             | 
            
                39.00
             |                     
            
                4.14
             |                                 
            
                2,000
             |            
            
                 
             |                                       
         
    
        
            | 
                8/16/2012
             | 
            
                0.00 / 0.00%
             |             
            
                38.00
             |           
            
                39.00
             |               
            
                38.00
             |                           
            
                39.00
             | 
            
                39.00
             |                     
            
                4.14
             |                                 
            
                1,120
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/15/2012
             | 
            
                0.00 / 0.00%
             |             
            
                39.00
             |           
            
                39.00
             |               
            
                39.00
             |                           
            
                39.00
             | 
            
                39.00
             |                     
            
                4.14
             |                                 
            
                50
             |            
            
                 
             |                                       
         
    
        
            | 
                8/14/2012
             | 
            
                -0.80 / -2.01%
             |             
            
                39.00
             |           
            
                39.00
             |               
            
                39.00
             |                           
            
                39.00
             | 
            
                39.00
             |                     
            
                4.14
             |                                 
            
                250
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/13/2012
             | 
            
                +1.50 / +3.92%
             |             
            
                38.30
             |           
            
                39.90
             |               
            
                38.30
             |                           
            
                39.80
             | 
            
                39.80
             |                     
            
                4.22
             |                                 
            
                640
             |            
            
                 
             |                                       
         
    
        
            | 
                8/10/2012
             | 
            
                -1.60 / -4.01%
             |             
            
                39.80
             |           
            
                39.80
             |               
            
                38.30
             |                           
            
                38.30
             | 
            
                38.30
             |                     
            
                4.06
             |                                 
            
                1,950
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/9/2012
             | 
            
                0.00 / 0.00%
             |             
            
                38.10
             |           
            
                39.90
             |               
            
                38.10
             |                           
            
                39.90
             | 
            
                39.90
             |                     
            
                4.23
             |                                 
            
                1,100
             |            
            
                 
             |                                       
         
    
        
            | 
                8/8/2012
             | 
            
                +1.00 / +2.57%
             |             
            
                38.90
             |           
            
                39.90
             |               
            
                38.50
             |                           
            
                39.90
             | 
            
                39.90
             |                     
            
                4.23
             |                                 
            
                47,700
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/7/2012
             | 
            
                0.00 / 0.00%
             |             
            
                38.90
             |           
            
                38.90
             |               
            
                38.90
             |                           
            
                38.90
             | 
            
                38.90
             |                     
            
                4.13
             |                                 
            
                0
             |            
            
                 
             |                                       
         
    
        
            | 
                8/6/2012
             | 
            
                +0.90 / +2.37%
             |             
            
                38.00
             |           
            
                38.90
             |               
            
                38.00
             |                           
            
                38.90
             | 
            
                38.90
             |                     
            
                4.13
             |                                 
            
                3,210
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/3/2012
             | 
            
                -1.00 / -2.56%
             |             
            
                38.00
             |           
            
                38.00
             |               
            
                38.00
             |                           
            
                38.00
             | 
            
                38.00
             |                     
            
                4.03
             |                                 
            
                740
             |            
            
                 
             |                                       
         
    
        
            | 
                8/2/2012
             | 
            
                0.00 / 0.00%
             |             
            
                39.00
             |           
            
                39.00
             |               
            
                39.00
             |                           
            
                39.00
             | 
            
                39.00
             |                     
            
                4.14
             |                                 
            
                0
             |  
            
                 
             |                                                              
             
    
         
    
    
 |