| Year | Value | | 2021 | 95.56937168 | | 2020 | 94.34995199 | | 2019 | 93.14608695 | | 2018 | 91.8 | | 2017 | 89.68614767 | | 2016 | 89.13468774 | | 2015 | 87.4790556 | | 2014 | 87.4 | | 2013 | 86.34 | | 2012 | 85.2 | | 2011 | 85.19302818 | | 2010 | 83.9 | | 2009 | 81.3 | | 2008 | 79.2 | | 2007 | 77.2 | | 2006 | 75.7 | | 2005 | 70.1 | | 2004 | 67.8 | | 2003 | 65.1 | | 2002 | 61.4 | | 2001 | 55.1 | | 2000 | 47.1 | | 1999 | 34 | | 1998 | 24.8 | | 1997 | 15.1 | | 1996 | 4.549656748 | | 1995 | 3.552007211 | | 1994 | 2.720004329 | | 1993 | 2.167270203 | | 1992 | 1.751713322 | | 1991 | 1.17995597 | | 1990 | 0.595714223 |
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