| Year | Value | | 2022 | 92.51968504 | | 2021 | 92.05298013 | | 2020 | 91.33333333 | | 2019 | 93.2885906 | | 2018 | 91.89189189 | | 2017 | 93.19727891 | | 2016 | 90.4109589 | | 2015 | 91.72413793 | | 2014 | 91.666666 | | 2013 | 93.9564 | | 2012 | 92.85999236 | | 2011 | 91.41999576 | | 2010 | 90.72 | | 2009 | 89.63 | | 2008 | 87.42 | | 2007 | 85.82 | | 2006 | 83.7 | | 2005 | 81 | | 2004 | 68.52 | | 2003 | 64.35 | | 2002 | 61.29 | | 2001 | 49.37306211 | | 2000 | 43.98435137 | | 1999 | 39.17600725 | | 1998 | 22.24382769 | | 1997 | 14.0655114 | | 1996 | 9.649069145 | | 1995 | 6.47315766 | | 1994 | 3.257308831 | | 1993 | 1.967087737 | | 1992 | 1.320008028 | | 1991 | 0.531496128 | | 1990 | 0.334386942 |
|