| 
                 
                    Closing price on 1/5/2012
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    42.50 | 
                 
                
                    | High | 
                    42.50 | 
                 
                
                    | Low | 
                    42.50 | 
                     
                
                    | Volume | 
                    1,020 | 
                                 
                
                    | Split-adjusted Price | 
                    4.26 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
IMP Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                1/5/2012
             | 
            
                0.00 / 0.00%
             |             
            
                42.50
             |           
            
                42.50
             |               
            
                42.50
             |                           
            
                42.50
             | 
            
                42.50
             |                     
            
                4.26
             |                                 
            
                1,020
             |            
            
                 
             |                                       
         
    
        
            | 
                1/4/2012
             | 
            
                +1.90 / +4.68%
             |             
            
                41.00
             |           
            
                42.50
             |               
            
                40.50
             |                           
            
                42.50
             | 
            
                42.50
             |                     
            
                4.26
             |                                 
            
                5,010
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/3/2012
             | 
            
                +1.90 / +4.91%
             |             
            
                39.00
             |           
            
                40.60
             |               
            
                39.00
             |                           
            
                40.60
             | 
            
                40.60
             |                     
            
                4.07
             |                                 
            
                20
             |            
            
                 
             |                                       
         
    
        
            | 
                12/30/2011
             | 
            
                +1.80 / +4.88%
             |             
            
                35.10
             |           
            
                38.70
             |               
            
                35.10
             |                           
            
                38.70
             | 
            
                38.70
             |                     
            
                3.87
             |                                 
            
                20,180
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/29/2011
             | 
            
                -1.90 / -4.90%
             |             
            
                36.90
             |           
            
                36.90
             |               
            
                36.90
             |                           
            
                36.90
             | 
            
                36.90
             |                     
            
                3.69
             |                                 
            
                7,210
             |            
            
                 
             |                                       
         
    
        
            | 
                12/28/2011
             | 
            
                +0.20 / +0.52%
             |             
            
                38.60
             |           
            
                38.90
             |               
            
                38.60
             |                           
            
                38.80
             | 
            
                38.80
             |                     
            
                3.88
             |                                 
            
                1,810
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/27/2011
             | 
            
                0.00 / 0.00%
             |             
            
                38.60
             |           
            
                38.60
             |               
            
                38.00
             |                           
            
                38.60
             | 
            
                38.60
             |                     
            
                3.86
             |                                 
            
                12,510
             |            
            
                 
             |                                       
         
    
        
            | 
                12/26/2011
             | 
            
                +0.20 / +0.52%
             |             
            
                38.00
             |           
            
                38.60
             |               
            
                38.00
             |                           
            
                38.60
             | 
            
                38.60
             |                     
            
                3.86
             |                                 
            
                10,760
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/23/2011
             | 
            
                +0.30 / +0.79%
             |             
            
                38.00
             |           
            
                38.40
             |               
            
                38.00
             |                           
            
                38.40
             | 
            
                38.40
             |                     
            
                3.84
             |                                 
            
                2,610
             |            
            
                 
             |                                       
         
    
        
            | 
                12/22/2011
             | 
            
                +1.80 / +4.96%
             |             
            
                36.00
             |           
            
                38.10
             |               
            
                36.00
             |                           
            
                38.10
             | 
            
                38.10
             |                     
            
                3.81
             |                                 
            
                13,230
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/21/2011
             | 
            
                0.00 / 0.00%
             |             
            
                36.00
             |           
            
                36.40
             |               
            
                36.00
             |                           
            
                36.30
             | 
            
                36.30
             |                     
            
                3.63
             |                                 
            
                4,100
             |            
            
                 
             |                                       
         
    
        
            | 
                12/20/2011
             | 
            
                0.00 / 0.00%
             |             
            
                36.50
             |           
            
                36.50
             |               
            
                36.30
             |                           
            
                36.30
             | 
            
                36.30
             |                     
            
                3.63
             |                                 
            
                11,200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/19/2011
             | 
            
                -0.20 / -0.55%
             |             
            
                36.20
             |           
            
                36.50
             |               
            
                35.50
             |                           
            
                36.30
             | 
            
                36.30
             |                     
            
                3.63
             |                                 
            
                10,960
             |            
            
                 
             |                                       
         
    
        
            | 
                12/16/2011
             | 
            
                0.00 / 0.00%
             |             
            
                36.00
             |           
            
                36.50
             |               
            
                35.00
             |                           
            
                36.50
             | 
            
                36.50
             |                     
            
                3.65
             |                                 
            
                9,710
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/15/2011
             | 
            
                +0.50 / +1.39%
             |             
            
                35.10
             |           
            
                36.50
             |               
            
                35.10
             |                           
            
                36.50
             | 
            
                36.50
             |                     
            
                3.65
             |                                 
            
                6,760
             |            
            
                 
             |                                       
         
    
        
            | 
                12/14/2011
             | 
            
                +0.10 / +0.28%
             |             
            
                36.50
             |           
            
                36.50
             |               
            
                35.50
             |                           
            
                36.00
             | 
            
                36.00
             |                     
            
                3.60
             |                                 
            
                10,540
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/13/2011
             | 
            
                +0.40 / +1.13%
             |             
            
                36.00
             |           
            
                36.00
             |               
            
                35.80
             |                           
            
                35.90
             | 
            
                35.90
             |                     
            
                3.59
             |                                 
            
                2,390
             |            
            
                 
             |                                       
         
    
        
            | 
                12/12/2011
             | 
            
                +0.30 / +0.85%
             |             
            
                35.30
             |           
            
                35.50
             |               
            
                34.50
             |                           
            
                35.50
             | 
            
                35.50
             |                     
            
                3.55
             |                                 
            
                9,240
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/9/2011
             | 
            
                -1.30 / -3.56%
             |             
            
                36.00
             |           
            
                36.00
             |               
            
                35.00
             |                           
            
                35.20
             | 
            
                35.20
             |                     
            
                3.52
             |                                 
            
                3,320
             |            
            
                 
             |                                       
         
    
        
            | 
                12/8/2011
             | 
            
                0.00 / 0.00%
             |             
            
                36.50
             |           
            
                36.50
             |               
            
                35.20
             |                           
            
                36.50
             | 
            
                36.50
             |                     
            
                3.65
             |                                 
            
                2,040
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/7/2011
             | 
            
                0.00 / 0.00%
             |             
            
                36.50
             |           
            
                36.50
             |               
            
                35.00
             |                           
            
                36.50
             | 
            
                36.50
             |                     
            
                3.65
             |                                 
            
                2,740
             |            
            
                 
             |                                       
         
    
        
            | 
                12/6/2011
             | 
            
                +0.50 / +1.39%
             |             
            
                36.00
             |           
            
                36.50
             |               
            
                36.00
             |                           
            
                36.50
             | 
            
                36.50
             |                     
            
                3.65
             |                                 
            
                500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/5/2011
             | 
            
                +1.70 / +4.96%
             |             
            
                36.00
             |           
            
                36.00
             |               
            
                32.60
             |                           
            
                36.00
             | 
            
                36.00
             |                     
            
                3.60
             |                                 
            
                10,940
             |            
            
                 
             |                                       
         
    
        
            | 
                12/2/2011
             | 
            
                -1.80 / -4.99%
             |             
            
                34.30
             |           
            
                35.50
             |               
            
                34.30
             |                           
            
                34.30
             | 
            
                34.30
             |                     
            
                3.43
             |                                 
            
                20,720
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/1/2011
             | 
            
                -1.90 / -5.00%
             |             
            
                39.90
             |           
            
                39.90
             |               
            
                36.10
             |                           
            
                36.10
             | 
            
                36.10
             |                     
            
                3.61
             |                                 
            
                1,910
             |            
            
                 
             |                                       
         
    
        
            | 
                11/30/2011
             | 
            
                -1.90 / -4.76%
             |             
            
                39.90
             |           
            
                41.80
             |               
            
                38.00
             |                           
            
                38.00
             | 
            
                38.00
             |                     
            
                3.80
             |                                 
            
                360
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/29/2011
             | 
            
                -2.10 / -5.00%
             |             
            
                39.90
             |           
            
                40.00
             |               
            
                39.90
             |                           
            
                39.90
             | 
            
                39.90
             |                     
            
                3.99
             |                                 
            
                3,650
             |            
            
                 
             |                                       
         
    
        
            | 
                11/28/2011
             | 
            
                0.00 / 0.00%
             |             
            
                40.00
             |           
            
                42.00
             |               
            
                39.90
             |                           
            
                42.00
             | 
            
                42.00
             |                     
            
                4.21
             |                                 
            
                760
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/25/2011
             | 
            
                -0.30 / -0.71%
             |             
            
                40.50
             |           
            
                42.30
             |               
            
                40.20
             |                           
            
                42.00
             | 
            
                42.00
             |                     
            
                4.21
             |                                 
            
                1,120
             |            
            
                 
             |                                       
         
    
        
            | 
                11/24/2011
             | 
            
                -2.20 / -4.94%
             |             
            
                42.30
             |           
            
                42.30
             |               
            
                42.30
             |                           
            
                42.30
             | 
            
                42.30
             |                     
            
                4.24
             |                                 
            
                160
             |  
            
                 
             |                                                              
             
    
         
    
    
 |