| Year | Value | | 2021 | 9,455 | | 2020 | 9,453.8 | | 2019 | 9,454 | | 2018 | 9,327 | | 2017 | 9,021 | | 2016 | 8,576 | | 2015 | 8,559.5 | | 2014 | 8,559.5 | | 2013 | 8,592.5 | | 2012 | 8,368 | | 2011 | 8,367.5 | | 2010 | 8,216.5 | | 2009 | 7,903.5 | | 2008 | 7,554.5 | | 2007 | 7,335 | | 2006 | 7,265 | | 2005 | 7,131 | | 2004 | 6,405 | | 2003 | 6,154 | | 2002 | 6,152 | | 2001 | 6,048 | | 2000 | 6,042 | | 1999 | 6,005 | | 1998 | 6,002 | | 1997 | 5,733 | | 1996 | 5,372 | | 1995 | 5,332 |
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