Year | Value | 2021 | 81.073170731707 | 2020 | 80.975609756098 | 2019 | 81.675609756098 | 2018 | 81.324390243902 | 2017 | 81.424390243902 | 2016 | 81.124390243902 | 2015 | 81.124390243902 | 2014 | 81.121951219512 | 2013 | 80.721951219512 | 2012 | 80.373170731707 | 2011 | 80.470731707317 | 2010 | 79.026829268293 | 2009 | 78.726829268293 | 2008 | 78.524390243903 | 2007 | 78.321951219512 | 2006 | 78.419512195122 | 2005 | 78.070731707317 | 2004 | 77.670731707317 | 2003 | 77.219512195122 | 2002 | 77.065853658537 | 2001 | 76.814634146342 | 2000 | 76.314634146342 | 1999 | 75.963414634146 | 1998 | 75.712195121951 | 1997 | 75.412195121951 | 1996 | 75.260975609756 | 1995 | 75.312195121951 | 1994 | 74.914634146341 | 1993 | 74.512195121951 | 1992 | 74.312195121951 | 1991 | 74.014634146342 | 1990 | 73.965853658537 | 1989 | 74.265853658537 | 1988 | 73.714634146341 | 1987 | 73.665853658537 | 1986 | 73.265853658537 | 1985 | 72.814634146342 | 1984 | 72.514634146342 | 1983 | 72.265853658537 | 1982 | 72.414634146341 | 1981 | 71.614634146342 | 1980 | 71.214634146341 | 1979 | 71.168292682927 | 1978 | 70.317073170732 | 1977 | 70.012195121951 | 1976 | 68.860975609756 | 1975 | 68.309756097561 | 1974 | 68.019512195122 | 1973 | 67.524390243902 | 1972 | 68.324390243902 | 1971 | 66.770731707317 | 1970 | 67.073170731707 | 1969 | 66.278170731707 | 1968 | 66.678195121951 | 1967 | 66.334073170732 | 1966 | 65.487658536585 | 1965 | 65.960463414634 | 1964 | 64.983390243902 | 1963 | 64.788390243902 | 1962 | 64.181024390244 | 1961 | 62.666512195122 | 1960 | 64.007463414634 |
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