| Year | Value | | 2022 | 91.62984383 | | 2021 | 91.43060973 | | 2020 | 89.81294133 | | 2019 | 88.13451691 | | 2018 | 87.03711209 | | 2017 | 84.3941537 | | 2016 | 84.16520664 | | 2015 | 87.58979935 | | 2014 | 86.19 | | 2013 | 84.17 | | 2012 | 82.34999847 | | 2011 | 81.26999954 | | 2010 | 82 | | 2009 | 79 | | 2008 | 78 | | 2007 | 75.16 | | 2006 | 72.16 | | 2005 | 68.71 | | 2004 | 64.73 | | 2003 | 55.9 | | 2002 | 48.82 | | 2001 | 31.65093942 | | 2000 | 30.2163466 | | 1999 | 20.84598264 | | 1998 | 9.877852428 | | 1997 | 6.711087477 | | 1996 | 3.054805234 | | 1995 | 1.837737754 | | 1994 | 0.922541043 | | 1993 | 0.463635096 | | 1992 | 0.43528529 | | 1991 | 0.250274153 | | 1990 | 0.125892223 |
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