| Year | Value | | 2014 | 1,941.221831891 | | 2013 | 1,887.0200713337 | | 2012 | 1,809.1025823941 | | 2011 | 1,649.2583324266 | | 2010 | 1,371.7212136787 | | 2009 | 1,323.7233667082 | | 2008 | 1,378.7203639987 | | 2007 | 1,456.2295953231 | | 2006 | 1,377.4336961521 | | 2005 | 1,374.3075194669 | | 2004 | 1,417.9089858366 | | 2003 | 1,644.3598437531 | | 2002 | 1,365.9406496083 | | 2001 | 1,445.8757153546 | | 2000 | 1,696.0640209048 | | 1999 | 1,795.3061730435 | | 1998 | 1,684.0008387503 | | 1997 | 1,802.8702836215 | | 1996 | 1,965.6900872872 | | 1995 | 2,074.3794404 | | 1994 | 1,896.3035148723 | | 1993 | 1,914.2294152811 | | 1992 | 2,328.2544182132 | | 1991 | 2,322.3407115333 | | 1990 | 2,330.5702313718 |
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