Year | Value | 2022 | 99.979224421478 | 2021 | 97.204242619283 | 2020 | 94.946556494439 | 2019 | 95.962953725659 | 2018 | 96.882605457586 | 2017 | 95.483221248619 | 2016 | 95.004590472457 | 2015 | 95.405482671176 | 2014 | 96.523391076868 | 2013 | 96.846283102268 | 2012 | 97.833098747726 | 2011 | 97.090585401118 | 2010 | 98.13650722895 | 2009 | 97.675202502928 | 2008 | 99.901357454333 | 2007 | 97.495051369706 | 2006 | 97.704134909815 | 2005 | 97.740132202179 | 2004 | 95.83205428164 | 2003 | 95.599432510404 | 2002 | 94.389250021228 | 2001 | 94.981818579045 | 2000 | 90.920131818095 | 1999 | 90.996665828202 | 1998 | 90.685004629884 | 1997 | 91.955195304806 | 1996 | 92.085939081106 | 1995 | 91.116230053696 | 1994 | 91.649701613722 | 1993 | 91.126578482721 | 1992 | 90.904954640668 | 1991 | 89.319763646543 | 1990 | 90.211828291164 | 1989 | 91.651532570966 | 1988 | 92.133373340473 | 1987 | 92.534587375859 | 1986 | 88.207471977475 | 1985 | 89.538369659285 | 1984 | 90.576559761599 | 1983 | 90.486186055859 | 1982 | 89.7556552629 | 1981 | 89.480102603075 | 1980 | 86.867121479432 | 1979 | 85.757535254613 | 1978 | 84.167954265873 | 1977 | 81.762611741169 | 1976 | 84.605865136148 | 1975 | 85.715463945802 | 1974 | 84.659183446439 | 1973 | 85.637549212301 | 1972 | 87.502974349212 | 1971 | 87.026400644901 | 1970 | 86.381302521008 | 1969 | 88.218496456715 | 1968 | 86.538342129773 | 1967 | 90.361197110423 | 1966 | 89.436974185662 | 1965 | 89.514803178219 | 1964 | 89.885312130345 | 1963 | 91.091225847323 | 1962 | 92.855893669115 | 1961 | 92.625623908761 | 1960 | 91.596405863971 |
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