|  
                Year  
            |  
         
             Beginning Price  
            |  
         
             Ending Price  
            |  
         
             Gain or Loss 
            |  
         
             Percent Gain or Loss  
            |  
      
|  
           1991 
            |  
         
           26.25 
            |  
         
           26.25 
            |  
         
           0 
            |  
         
           0.00% 
            |  
      
|  
           1992 
            |  
         
           26.25 
            |  
         
           19.75 
              
           |  
         
           -6.50 
            |  
         
           -24.76% 
            |  
      
|  
           1993 
            |  
         
           19.75 
            |  
         
           17.75 
              
           |  
         
           -2.00 
            |  
         
           -10.13% 
            |  
      
|  
           1994 
            |  
         
           17.75 
            |  
         
           18.50 
              
           |  
         
           0.75 
            |  
         
           4.23% 
            |  
      
|  
           1995 
            |  
         
           18.50 
            |  
         
           22.625 
              
           |  
         
           4.125 
            |  
         
           22.30% 
            |  
      
|  
           1996 
            |  
         
           22.625 
            |  
         
           25.00 
              
           |  
         
           2.375 
            |  
         
           10.50% 
            |  
      
|  
           1997 
            |  
         
           25.00 
            |  
         
           35.75 
              
           |  
         
           10.75 
            |  
         
           43.00% 
            |  
      
|  
           1998 
            |  
         
           35.75 
            |  
         
           18.50 
              
           |  
         
           -17.25 
            |  
         
           -48.25% 
            |  
      
|  
           1999 
            |  
         
           18.50 
            |  
         
           15.00 
              
           |  
         
           -3.50 
            |  
         
           -18.92% 
            |  
      
|  
           2000 
            |  
         
           15.00 
            |  
         
           17.9375 
              
           |  
         
           2.9375 
            |  
         
           19.58% 
            |  
      
|  
           2001 
            |  
         
           17.9375 
            |  
         
           26.80 
              
           |  
         
           8.8625 
            |  
         
           49.41% 
            |  
      
|  
           2002 
            |  
         
           26.80 
            |  
         
           23.45 
              
           |  
         
           -3.35 
            |  
         
           -12.50% 
            |  
      
|  
           2003 
            |  
         
           23.45 
            |  
         
           28.76 
              
           |  
         
           5.31 
            |  
         
           22.64% 
            |  
      
|  
           2004 
            |  
         
           28.76 
            |  
         
           39.63 
              
           |  
         
           10.87 
            |  
         
           37.80% 
            |  
      
|  
           2005 
            |  
         
           39.63 
            |  
         
           99.74* 
              
           |  
         
           60.11 
            |  
         
           151.68% 
            |  
      
|  
           2006 
            |  
         
           49.87 
            |  
         
           58.08 
              
           |  
         
           8.21 
            |  
         
           16.46% 
            |  
      
|  
           2007 
            |  
         
           58.08 
            |  
         
           57.29 
            |  
         
           -0.79 
            |  
         
           -1.36% 
            |  
      
|  
           2008 
            |  
         
           57.29 
            |  
         
           34.50 
            |  
         
           -22.79 
            |  
         
           -39.78% 
            |  
      
|  
           2009 
            |  
         
           34.50 
            |  
         
           73.20 
            |  
         
           38.70 
            |  
         
           112.17% 
            |  
      
|  
           2010 
            |  
         
           73.20 
            |  
         
           124.78* 
            |  
         
           51.58 
                
           |  
         
           70.46% 
            |  
      
|  
           2011 
            |  
         
           62.39 
            |  
         
           67.31 
            |  
         
           4.92 
                
           |  
         
           7.89% 
            |  
      
|  
           2012 
            |  
         
           67.31 
            |  
         
           58.13 
            |  
         
           -9.18 
                
           |  
         
           -13.64% 
            |  
      
|  
           2013 
            |  
         
           58.13 
            |  
         
           88.50** 
            |  
         
           30.37 
                
           |  
         
           52.24% 
            |