Year | Value | 2021 | 76.741463414634 | 2020 | 78.595121951219 | 2019 | 78.646341463415 | 2018 | 78.243902439024 | 2017 | 78.092682926829 | 2016 | 77.641463414634 | 2015 | 77.590243902439 | 2014 | 77.034146341463 | 2013 | 77.141463414634 | 2012 | 76.326829268293 | 2011 | 76.229268292683 | 2010 | 75.429268292683 | 2009 | 74.824390243902 | 2008 | 73.770731707317 | 2007 | 72.814634146342 | 2006 | 72.691463414634 | 2005 | 72.568292682927 | 2004 | 71.909756097561 | 2003 | 71.317073170732 | 2002 | 70.904878048781 | 2001 | 70.258536585366 | 2000 | 70.417073170732 | 1999 | 70.063414634146 | 1998 | 69.358536585366 | 1997 | 69.809756097561 | 1996 | 69.612195121951 | 1995 | 67.543902439024 | 1994 | 66.5 | 1993 | 67.909756097561 | 1992 | 68.863414634146 | 1991 | 69.373170731707 | 1990 | 69.475609756098 | 1989 | 70.039024390244 | 1988 | 70.69756097561 | 1987 | 70.643902439024 | 1986 | 70.085365853659 | 1985 | 69.380487804878 | 1984 | 69.278048780488 | 1983 | 69.375609756098 | 1982 | 69.126829268293 | 1981 | 68.978048780488 | 1980 | 68.795634146341 | 1979 | 68.785853658537 | 1978 | 68.920609756098 | 1977 | 69.324829268293 | 1976 | 68.925682926829 | 1975 | 69.354365853659 | 1974 | 70.078609756098 | 1973 | 69.799463414634 | 1972 | 69.592146341463 | 1971 | 69.815170731707 | 1970 | 69.410097560976 | 1969 | 69.265902439024 | 1968 | 69.751219512195 | 1967 | 69.940146341463 | 1966 | 69.627756097561 | 1965 | 69.680731707317 | 1964 | 70.057317073171 | 1963 | 69.21012195122 | 1962 | 68.791804878049 | 1961 | 68.96212195122 | 1960 | 68.933512195122 |
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