|  
                Year  
            |  
         
             Beginning Price  
            |  
         
             Ending Price  
            |  
         
             Gain or Loss 
            |  
         
             Percent Gain or Loss  
            |  
      
|  
           1987 
            |  
         
           8.50 
            |  
         
           11.50 
              
           |  
         
           3.00 
            |  
         
           35.29% 
            |  
      
|  
           1988 
            |  
         
           11.50 
            |  
         
           8.375 
              
           |  
         
           -3.125 
            |  
         
           -21.17% 
            |  
      
|  
           1989 
            |  
         
           8.375 
            |  
         
           10.375 
              
           |  
         
           2.00 
            |  
         
           23.88% 
            |  
      
|  
           1990 
            |  
         
           10.375 
            |  
         
           12.625 
              
           |  
         
           2.25 
            |  
         
           21.69% 
            |  
      
|  
           1991 
            |  
         
           12.625 
            |  
         
           32.75 
              
           |  
         
           20.125 
            |  
         
           159.41% 
            |  
      
|  
           1992 
            |  
         
           32.75 
            |  
         
           51.00* 
              
           |  
         
           18.25 
            |  
         
           55.73% 
            |  
      
|  
           1993 
            |  
         
           25.50 
            |  
         
           38.75 
              
           |  
         
           13.25 
            |  
         
           51.96% 
            |  
      
|  
           1994 
            |  
         
           38.75 
            |  
         
           49.50 
              
           |  
         
           10.75 
            |  
         
           27.74% 
            |  
      
|  
           1995 
            |  
         
           49.50 
            |  
         
           78.50* 
            |  
         
           29.00 
            |  
         
           58.59% 
            |  
      
|  
           1996 
            |  
         
           39.25 
            |  
         
           43.875 
            |  
         
           4.625 
            |  
         
           11.78% 
            |  
      
|  
           1997 
            |  
         
           43.875 
            |  
         
           57.625 
            |  
         
           13.75 
            |  
         
           31.34% 
            |  
      
|  
           1998 
            |  
         
           57.625 
            |  
         
           89.5625 
            |  
         
           31.9375 
            |  
         
           55.42% 
            |  
      
|  
           1999 
            |  
         
           89.5625 
            |  
         
           143.125* 
              
           |  
         
           53.5625 
            |  
         
           59.80% 
            |  
      
|  
           2000 
            |  
         
           71.5625 
            |  
         
           92.50* 
            |  
         
           20.9375 
            |  
         
           29.26% 
            |  
      
|  
           2001 
            |  
         
           46.25 
            |  
         
           39.04 
              
           |  
         
           -7.21 
            |  
         
           -15.59% 
            |  
      
|  
           2002 
            |  
         
           39.04 
            |  
         
           25.72 
              
           |  
         
           -13.32 
            |  
         
           -34.12% 
            |  
      
|  
           2003 
            |  
         
           25.72 
            |  
         
           42.07 
            |  
         
           16.35 
            |  
         
           63.57% 
            |  
      
|  
           2004 
            |  
         
           42.07 
            |  
         
           38.76 
              
           |  
         
           -3.31 
            |  
         
           -7.87% 
            |  
      
|  
           2005 
            |  
         
           38.76 
            |  
         
           36.07 
            |  
         
           -2.69 
            |  
         
           -6.94% 
            |  
      
|  
           2006 
            |  
         
           36.07 
            |  
         
           30.32 
              
           |  
         
           -5.75 
            |  
         
           -15.94% 
            |  
      
|  
           2007 
            |  
         
           30.32 
            |  
         
           31.83 
            |  
         
           1.51 
            |  
         
           4.98% 
            |  
      
|  
           2008 
            |  
         
           31.83 
            |  
         
           22.12 
            |  
         
           -9.71 
            |  
         
           -30.51% 
            |  
      
|  
           2009 
            |  
         
           22.12 
            |  
         
           30.56 
            |  
         
           8.44 
            |  
         
           38.16% 
            |  
      
|  
           2010 
            |  
         
           30.56 
            |  
         
           34.59 
            |  
         
           4.03 
            |  
         
           13.19% 
            |  
      
|  
           2011 
            |  
         
           34.59 
            |  
         
           30.03 
            |  
         
           -4.56 
            |  
         
           -13.18% 
            |  
      
|  
           2012 
            |  
         
           30.03 
            |  
         
           34.30 
            |  
         
           4.27 
            |  
         
           14.22% 
            |  
      
|  
           2013 
            |  
         
           34.30 
            |  
         
           45.55 
            |  
         
           11.25 
            |  
         
           32.80% 
            |  
      
|  
           2014 
            |  
         
           45.55 
            |  
         
           45.60 
            |  
         
           0.05 
            |  
         
           0.11% 
            |  
      
|  
           2015 
            |  
         
           45.60 
            |  
         
           42.47 
            |  
         
           -3.13 
            |  
         
           -6.86% 
            |  
      
|  
           2016 
            |  
         
           42.47 
            |  
         
           62.35 
            |  
         
           19.88 
            |  
         
           46.81% 
            |  
      
|  
           2017 
            |  
         
           62.35 
            |  
         
           66.6639* 
            |  
         
           4.3139 
            |  
         
           6.92% 
            |