|  
                Year  
            |  
         
             Beginning Price  
            |  
         
             Ending Price  
            |  
         
             Gain or Loss 
            |  
         
             Percent Gain or Loss  
            |  
      
|  
           1996 
            |  
         
           18.25 
            |  
         
           27.625 
            |  
         
           9.375 
            |  
         
           51.37% 
            |  
      
|  
           1997 
            |  
         
           27.625 
            |  
         
           38.00 
            |  
         
           10.375 
            |  
         
           37.56% 
            |  
      
|  
           1998 
            |  
         
           38.00 
            |  
         
           100.50 
            |  
         
           62.50 
            |  
         
           164.47% 
            |  
      
|  
           1999 
            |  
         
           100.50 
            |  
         
           181.00* 
            |  
         
           80.50 
            |  
         
           80.10% 
            |  
      
|  
           2000 
            |  
         
           90.50 
            |  
         
           44.3125 
            |  
         
           -46.1875 
            |  
         
           -51.04% 
            |  
      
|  
           2001 
            |  
         
           44.3125 
            |  
         
           59.00 
            |  
         
           14.6875 
            |  
         
           33.15% 
            |  
      
|  
           2002 
            |  
         
           59.00 
            |  
         
           60.50 
            |  
         
           1.50 
            |  
         
           2.54% 
            |  
      
|  
           2003 
            |  
         
           60.50 
            |  
         
           78.64 
            |  
         
           18.14 
            |  
         
           29.98% 
            |  
      
|  
           2004 
            |  
         
           78.64 
            |  
         
           85.00 
            |  
         
           6.36 
            |  
         
           8.09% 
            |  
      
|  
           2005 
            |  
         
           85.00 
            |  
         
           44.83 
            |  
         
           -40.17 
            |  
         
           -47.26% 
            |  
      
|  
           2006 
            |  
         
           44.83 
            |  
         
           73.20 
            |  
         
           28.37 
            |  
         
           63.28% 
            |  
      
|  
           2007 
            |  
         
           73.20 
            |  
         
           34.86 
            |  
         
           -38.34 
            |  
         
           -52.38% 
            |  
      
|  
           2008 
            |  
         
           34.86 
            |  
         
           26.90 
            |  
         
           -7.96 
            |  
         
           -22.83% 
            |  
      
|  
           2009 
            |  
         
           26.90 
            |  
         
           25.98 
            |  
         
           -0.92 
            |  
         
           -3.42% 
            |  
      
|  
           2010 
            |  
         
           25.98 
            |  
         
           34.82 
            |  
         
           8.84 
            |  
         
           34.03% 
            |  
      
|  
           2011 
            |  
         
           34.82 
            |  
         
           33.07 
            |  
         
           -1.75 
            |  
         
           -5.03% 
            |  
      
|  
           2012 
            |  
         
           33.07 
            |  
         
           23.19 
            |  
         
           -9.88 
            |  
         
           -29.88% 
            |  
      
|  
           2013 
            |  
         
           23.19 
            |  
         
           35.52 
            |  
         
           12.33 
            |  
         
           53.17% 
            |  
      
|  
           2014 
            |  
         
           35.52 
            |  
         
           41.27 
            |  
         
           5.75 
            |  
         
           16.19% 
            |  
      
|  
           2015 
            |  
        
           41.27 
            |  
         
           32.45 
            |  
         
           -8.82 
            |  
         
           -21.37% 
            |  
      
|  
           2016 
            |  
         
           32.45 
            |  
         
           40.50* 
            |  
         
           8.05 
            |  
         
           24.81% 
            |