| Year | Value | | 2023 | 1,461.7151414106 | | 2022 | 1,346.7669455742 | | 2021 | 1,420.2267040023 | | 2020 | 1,525.9896026915 | | 2019 | 1,584.5080794648 | | 2018 | 1,563.0012973944 | | 2017 | 1,545.2759817028 | | 2016 | 1,539.2861035867 | | 2015 | 1,521.3216065717 | | 2014 | 1,453.5997749379 | | 2013 | 1,433.5953787902 | | 2012 | 1,373.5963567759 | | 2011 | 1,324.8600570664 | | 2010 | 1,294.8986798655 | | 2009 | 1,326.1950120229 | | 2008 | 1,316.8006906274 | | 2007 | 1,298.010715078 | | 2006 | 1,225.3348169756 | | 2005 | 1,154.9778140908 | | 2004 | 1,176.5537039865 | | 2003 | 1,195.5162920207 | | 2002 | 1,187.4835494208 | | 2001 | 1,159.9826707006 | | 2000 | 1,139.6953617072 | | 1999 | 1,081.7152461609 | | 1998 | 1,045.7907736967 | | 1997 | 1,039.4679582547 | | 1996 | 972.44939568564 | | 1995 | 916.21678073459 | | 1994 | 894.54172465771 | | 1993 | 836.1750833477 | | 1992 | 900.35037731551 | | 1991 | 1,044.5396561183 | | 1990 | 1,208.3561775387 |
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