| Year | Value | | 2014 | 6,732.3674731561 | | 2013 | 6,664.6585690256 | | 2012 | 6,689.3677761179 | | 2011 | 6,314.4144476695 | | 2010 | 6,506.3181809647 | | 2009 | 5,975.9538109351 | | 2008 | 6,364.5678301386 | | 2007 | 6,277.4114628398 | | 2006 | 5,869.4247889457 | | 2005 | 5,531.5458286431 | | 2004 | 5,429.5255219992 | | 2003 | 5,158.602778102 | | 2002 | 4,767.4629354406 | | 2001 | 4,680.4479455953 | | 2000 | 4,540.4925607648 | | 1999 | 4,460.3681080443 | | 1998 | 4,733.9549083942 | | 1997 | 4,811.598137953 | | 1996 | 4,556.3911686543 | | 1995 | 4,244.644077754 | | 1994 | 4,354.8301076092 | | 1993 | 4,049.8538277845 | | 1992 | 4,933.8232368463 | | 1991 | 5,617.0635759367 | | 1990 | 5,755.894502458 |
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