| Year | Value | | 2021 | 8,037 | | 2020 | 7,587.7 | | 2019 | 7,587.7 | | 2018 | 7,587.7 | | 2017 | 7,751.7 | | 2016 | 7,748.7 | | 2015 | 7,896 | | 2014 | 7,894.8 | | 2013 | 7,894.8 | | 2012 | 7,894.8 | | 2011 | 7,877.9 | | 2010 | 7,902.7 | | 2009 | 7,892 | | 2008 | 7,892 | | 2007 | 7,942 | | 2006 | 7,960 | | 2005 | 7,950 | | 2004 | 7,950 | | 2003 | 7,950 | | 2002 | 7,950 | | 2001 | 7,736 | | 2000 | 8,005 | | 1999 | 7,988 | | 1998 | 7,988 | | 1997 | 7,988 | | 1996 | 7,988 | | 1995 | 7,988 |
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