|  
                Year  
            |  
         
             Beginning Price  
            |  
         
             Ending Price  
            |  
         
             Gain or Loss 
            |  
         
             Percent Gain or Loss  
            |  
      
|  
           2006 
            |  
         
           60.88 
            |  
         
           77.39 
              
           |  
         
           16.51 
            |  
         
           27.12% 
            |  
      
|  
           2007 
            |  
         
           77.39 
            |  
         
           104.30 
            |  
         
           26.91 
            |  
         
           34.77% 
            |  
      
|  
           2008 
            |  
         
           104.30 
            |  
         
           47.14* 
              
           |  
         
           -57.16 
            |  
         
           -54.80% 
            |  
      
|  
           2009 
            |  
         
           23.57 
            |  
         
           41.00 
            |  
         
           17.43 
            |  
         
           73.95% 
            |  
      
|  
           2010 
            |  
         
           41.00 
            |  
         
           48.15 
            |  
         
           7.15 
            |  
         
           17.44% 
            |  
      
|  
           2011 
            |  
         
           48.15 
            |  
         
           38.21 
            |  
         
           -9.94 
            |  
         
           -20.64% 
            |  
      
|  
           2012 
            |  
         
           38.21 
            |  
         
           44.53 
            |  
         
           6.32 
            |  
         
           16.54% 
            |  
      
|  
           2013 
            |  
         
           44.53 
            |  
         
           41.14 
            |  
         
           -3.39 
            |  
         
           -7.61% 
            |  
      
|  
           2014 
            |  
         
           41.14 
            |  
         
           40.02 
            |  
         
           -1.12 
            |  
         
           -2.72% 
            |  
      
|  
           2015 
            |  
        
           40.02 
            |  
         
           32.71 
            |  
         
           -7.31 
            |  
         
           -18.27% 
            |  
      
|  
           2016 
            |  
         
           32.71 
            |  
         
           35.78 
            |  
         
           3.07 
            |  
         
           9.39% 
            |  
      
|  
           2017 
            |  
         
           35.78 
            |  
         
           45.91 
            |  
         
           10.13 
            |  
         
           28.31% 
            |  
      
|  
           2018 
            |  
        
           45.91 
            |  
         
           38.10 
            |  
         
           -7.81 
            |  
         
           -17.01% 
            |  
      
|  
           2019 
            |  
        
           38.10 
            |  
         
           44.47 
            |  
         
           6.37 
            |  
         
           16.72% 
            |  
      
|  
           2020 
            |  
        
           44.47 
            |  
         
           50.11 
            |  
         
           5.64 
            |  
         
           12.68% 
            |  
      
|  
           2021 
            |  
        
           50.11 
            |  
         
           49.46 
            |  
         
           -0.65 
            |  
         
           -1.30% 
            |  
      
|  
           2022 
            |  
        
           49.46 
            |  
         
           38.98 
            |  
         
           -10.48 
            |  
         
           -21.19% 
            |  
      
|  
           2023 
            |  
        
           38.98 
            |  
         
           41.10 
            |  
         
           2.12 
            |  
         
           5.44% 
            |  
      
|  
           2024 
            |  
        
           41.10 
            |  
         
           44.04 
            |  
         
           2.94 
            |  
         
           7.15% 
            |