| Year | Value | | 2022 | 88.91242151 | | 2021 | 89.00399524 | | 2020 | 86.60130109 | | 2019 | 83.1083578 | | 2018 | 79.7499766 | | 2017 | 78.88542636 | | 2016 | 75.49850426 | | 2015 | 73.09865997 | | 2014 | 71.59 | | 2013 | 72.6756 | | 2012 | 68.34997453 | | 2011 | 67.33999481 | | 2010 | 70 | | 2009 | 64 | | 2008 | 58 | | 2007 | 56.74 | | 2006 | 54.01 | | 2005 | 46.81 | | 2004 | 40.81 | | 2003 | 31.85479301 | | 2002 | 27.83888542 | | 2001 | 30.17591047 | | 2000 | 15.11025956 | | 1999 | 12.61093843 | | 1998 | 10.10460285 | | 1997 | 7.591923004 | | 1996 | 5.072272271 | | 1995 | 2.898985609 | | 1994 | 1.071570172 | | 1993 | 0.409792399 |
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