| Year | Value | | 2021 | 4,732 | | 2020 | 4,732 | | 2019 | 4,735 | | 2018 | 4,642 | | 2017 | 4,642 | | 2016 | 4,304 | | 2015 | 4,238 | | 2014 | 4,202 | | 2013 | 4,186 | | 2012 | 4,192 | | 2011 | 4,258.4 | | 2010 | 4,227.2 | | 2009 | 4,230 | | 2008 | 4,229.6 | | 2007 | 4,230 | | 2006 | 4,005 | | 2005 | 4,014 | | 2004 | 4,014 | | 2003 | 4,126 | | 2002 | 4,126 | | 2001 | 4,080 | | 2000 | 3,645 | | 1999 | 3,645 | | 1998 | 3,641 | | 1997 | 3,468 | | 1996 | 3,483 | | 1995 | 3,483 |
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