| Year | Value | | 2014 | 6,727.9993016421 | | 2013 | 6,779.2808865057 | | 2012 | 6,718.9750524874 | | 2011 | 6,753.0736641818 | | 2010 | 6,510.8418843659 | | 2009 | 6,104.421844917 | | 2008 | 6,920.244039032 | | 2007 | 7,137.824175149 | | 2006 | 7,123.5377712934 | | 2005 | 6,917.8604670693 | | 2004 | 6,830.7050733796 | | 2003 | 6,578.0342360426 | | 2002 | 6,380.9519034559 | | 2001 | 6,006.3451904059 | | 2000 | 5,777.9956509169 | | 1999 | 5,675.6150263862 | | 1998 | 5,574.7064662457 | | 1997 | 5,434.662197954 | | 1996 | 5,365.5082800805 | | 1995 | 5,312.9045486343 | | 1994 | 5,240.1601855394 | | 1993 | 4,950.932498421 | | 1992 | 4,943.1554652196 | | 1991 | 5,087.4524676795 | | 1990 | 5,334.9054455572 |
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