|  
                Year  
            |  
         
             Beginning Price  
            |  
         
             Ending Price  
            |  
         
             Gain or Loss 
            |  
         
             Percent Gain or Loss  
            |  
      
|  
           2005 
            |  
         
           25.88 
            |  
         
           38.09 
                
           |  
         
           12.21 
            |  
         
           47.18% 
            |  
      
|  
           2006 
            |  
         
           38.09 
            |  
         
           48.51 
            |  
         
           10.42 
            |  
         
           27.36% 
            |  
      
|  
           2007 
            |  
         
           48.51 
            |  
         
           49.68 
            |  
         
           1.17 
            |  
         
           2.41% 
            |  
      
|  
           2008 
            |  
         
           49.68 
            |  
         
           12.95 
            |  
         
           -36.73 
            |  
         
           -73.93% 
            |  
      
|  
           2009 
            |  
         
           12.95 
            |  
         
           24.93 
            |  
         
           11.98 
            |  
         
           92.51% 
                
           |  
      
|  
           2010 
            |  
         
           24.93 
            |  
         
           40.99 
            |  
         
           16.06 
            |  
         
           64.42% 
                
           |  
      
|  
           2011 
            |  
         
           40.99 
            |  
         
           46.75 
            |  
         
           5.76 
            |  
         
           14.05% 
                
           |  
      
|  
           2012 
            |  
         
           46.75 
            |  
         
           49.21 
            |  
         
           2.46 
            |  
         
           5.26% 
                
           |  
      
|  
           2013 
            |  
         
           49.21 
            |  
         
           47.00 
            |  
         
           -2.21 
            |  
         
           -4.49% 
                
           |  
      
|  
           2014 
            |  
         
           47.00 
            |  
         
           56.62 
            |  
         
           9.62 
            |  
         
           20.47% 
                
           |  
      
|  
           2015 
            |  
         
           56.62 
            |  
         
           72.10* 
            |  
         
           15.48 
            |  
         
           27.34% 
                
           |