| Year | Value | | 2014 | 4,343.6197113294 | | 2013 | 4,316.9316576389 | | 2012 | 4,347.9003247358 | | 2011 | 4,273.8380143546 | | 2010 | 4,174.498740297 | | 2009 | 3,962.3430370479 | | 2008 | 4,181.3892096014 | | 2007 | 4,111.9486474764 | | 2006 | 3,995.1663315702 | | 2005 | 3,804.3267560636 | | 2004 | 3,712.9753200573 | | 2003 | 3,610.2949675846 | | 2002 | 3,488.6857907681 | | 2001 | 3,467.4513709367 | | 2000 | 3,428.1772732856 | | 1999 | 3,326.1887058935 | | 1998 | 3,286.1866546324 | | 1997 | 3,330.9843987048 | | 1996 | 3,396.2183782952 | | 1995 | 3,478.8428911776 | | 1994 | 3,543.575060199 | | 1993 | 3,870.539834522 | | 1992 | 4,182.450032577 | | 1991 | 4,505.9477269278 | | 1990 | 4,635.7937280547 |
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