| Year | Value | | 2014 | 2,032.1597286503 | | 2013 | 1,918.3502609526 | | 2012 | 1,606.5327077668 | | 2011 | 1,510.2382050906 | | 2010 | 1,498.2312804346 | | 2009 | 1,381.4759968545 | | 2008 | 1,422.6122836705 | | 2007 | 1,326.7358575215 | | 2006 | 1,287.364764714 | | 2005 | 1,235.9065431151 | | 2004 | 1,176.5405845429 | | 2003 | 1,117.8428057894 | | 2002 | 1,074.3132112064 | | 2001 | 1,048.2888262198 | | 2000 | 1,030.6085853857 | | 1999 | 1,019.9762156535 | | 1998 | 1,046.5052462468 | | 1997 | 1,037.4632993684 | | 1996 | 1,067.0194265418 | | 1995 | 1,075.8114502041 | | 1994 | 1,067.9944905736 | | 1993 | 1,095.8851012042 | | 1992 | 1,227.8146062543 | | 1991 | 1,351.3163402917 | | 1990 | 1,505.0200491988 | | 1989 | 1,620.1242441031 | | 1988 | 1,611.0747040054 | | 1987 | 1,568.6355986786 | | 1986 | 1,561.4910716824 | | 1985 | 1,469.987665022 |
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