| Year | Value | | 2014 | 1,645.4416292506 | | 2013 | 1,637.1944767749 | | 2012 | 1,610.8079060941 | | 2011 | 1,631.5262070799 | | 2010 | 1,653.4674957286 | | 2009 | 1,643.1498807955 | | 2008 | 1,652.6510101528 | | 2007 | 1,664.0613369064 | | 2006 | 1,755.7596292696 | | 2005 | 1,717.2010547636 | | 2004 | 1,765.4802846389 | | 2003 | 1,764.4562562457 | | 2002 | 1,775.809843759 | | 2001 | 1,769.3960812275 | | 2000 | 1,780.4579236037 | | 1999 | 1,745.9530718812 | | 1998 | 1,779.8844122906 | | 1997 | 1,815.8194955001 | | 1996 | 1,827.7717976319 | | 1995 | 1,844.1957428133 | | 1994 | 1,924.4760244894 | | 1993 | 2,018.2298787713 | | 1992 | 2,128.3509720733 | | 1991 | 2,324.9809087438 | | 1990 | 2,383.2276938079 |
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