| Year | Value | | 2014 | 4,228.4723852134 | | 2013 | 4,198.1164046274 | | 2012 | 4,226.0641277522 | | 2011 | 4,162.2091265302 | | 2010 | 4,065.1070474733 | | 2009 | 3,855.8905232069 | | 2008 | 4,065.9652177975 | | 2007 | 3,994.3958841954 | | 2006 | 3,881.6234792024 | | 2005 | 3,699.6147565293 | | 2004 | 3,614.1814665798 | | 2003 | 3,513.540264882 | | 2002 | 3,390.6089912949 | | 2001 | 3,373.2227812392 | | 2000 | 3,332.6191129694 | | 1999 | 3,234.6991090099 | | 1998 | 3,211.0802258782 | | 1997 | 3,256.0994242157 | | 1996 | 3,314.1332146249 | | 1995 | 3,368.7057311761 | | 1994 | 3,411.0671653001 | | 1993 | 3,688.7096778574 | | 1992 | 3,953.6715837627 | | 1991 | 4,251.6984680787 | | 1990 | 4,401.6055517373 |
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