| Year | Value | | 2022 | 1,548.6506383014 | | 2021 | 1,569.1710661367 | | 2020 | 1,470.2746279049 | | 2019 | 1,502.8256500438 | | 2018 | 1,466.9002507218 | | 2017 | 1,533.0635229072 | | 2016 | 1,478.4291385265 | | 2015 | 1,512.9463652711 | | 2014 | 1,383.4297542926 | | 2013 | 1,460.209903088 | | 2012 | 1,205.5566772195 | | 2011 | 1,175.926953332 | | 2010 | 1,132.3589963035 | | 2009 | 1,077.2834855692 | | 2008 | 999.82156735165 | | 2007 | 1,000.2457709745 | | 2006 | 972.68553780457 | | 2005 | 920.57777714375 | | 2004 | 924.05079044159 | | 2003 | 888.25802910095 | | 2002 | 885.33870572563 | | 2001 | 877.9815651069 | | 2000 | 857.43301587565 | | 1999 | 839.45169691542 | | 1998 | 907.8072134793 | | 1997 | 932.64893282263 | | 1996 | 926.42504013343 | | 1995 | 936.33058175497 | | 1994 | 926.65528144546 | | 1993 | 889.27671589424 | | 1992 | 793.97353794757 | | 1991 | 888.5633408193 | | 1990 | 889.39391590073 |
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