Year | Value | 2021 | 81.892523364486 | 2020 | 80.841121495327 | 2019 | 79.789719626168 | 2018 | 78.738317757009 | 2017 | 77.686915887851 | 2016 | 76.635514018692 | 2015 | 75.584112149533 | 2014 | 74.532710280374 | 2013 | 73.481308411215 | 2012 | 72.429906542056 | 2011 | 71.690031152648 | 2010 | 71.378504672897 | 2009 | 71.300623052959 | 2008 | 71.183800623053 | 2007 | 71.066978193146 | 2006 | 70.95015576324 | 2005 | 70.833333333333 | 2004 | 71.96261682243 | 2003 | 71.378504672897 | 2002 | 71.417445482866 | 2001 | 72.079439252336 | 2000 | 72.702492211838 | 1999 | 73.481308411215 | 1998 | 74.493769470405 | 1997 | 76.01246105919 | 1996 | 77.609034267913 | 1995 | 79.322429906542 | 1994 | 80.724299065421 | 1993 | 80.880062305296 | 1992 | 81.07476635514 | 1991 | 80.880062305296 | 1990 | 81.07476635514 | 1989 | 81.269470404984 | 1988 | 81.464174454829 | 1987 | 81.269470404984 | 1986 | 81.07476635514 | 1985 | 80.218068535826 | 1984 | 80.218068535826 | 1983 | 80.218068535826 | 1982 | 80.218068535826 | 1981 | 80.802180685358 | 1980 | 81.308411214953 | 1979 | 81.775700934579 | 1978 | 82.554517133956 | 1977 | 83.45015576324 | 1976 | 81.580996884735 | 1975 | 80.218068535826 | 1974 | 79.04984423676 | 1973 | 77.881619937695 | 1972 | 74.221183800623 | 1971 | 73.948598130841 | 1970 | 73.208722741433 | 1969 | 73.870716510903 | 1968 | 65.264797507788 | 1967 | 64.8753894081 | 1966 | 63.123052959502 | 1965 | 63.239875389408 | 1964 | 62.5 | 1963 | 62.461059190031 | 1962 | 61.915887850467 | 1961 | 61.331775700935 |
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