Year | Value | 2021 | 79.127341463415 | 2020 | 80.834951219512 | 2019 | 80.419707317073 | 2018 | 80.003097560976 | 2017 | 77.539024390244 | 2016 | 76.931707317073 | 2015 | 77.280487804878 | 2014 | 77.236585365854 | 2013 | 77.178048780488 | 2012 | 77.078048780488 | 2011 | 76.631707317073 | 2010 | 77.280487804878 | 2009 | 76.980487804878 | 2008 | 76.680487804878 | 2007 | 76.478048780488 | 2006 | 76.075609756098 | 2005 | 75.721951219512 | 2004 | 75.470731707317 | 2003 | 75.270731707317 | 2002 | 75.10243902439 | 2001 | 74.831707317073 | 2000 | 75.163414634146 | 1999 | 73.875609756098 | 1998 | 74.375609756098 | 1997 | 71.739024390244 | 1996 | 71.99756097561 | 1995 | 72.009756097561 | 1994 | 70.673170731707 | 1993 | 71.656097560976 | 1992 | 71.614634146342 | 1991 | 70.358536585366 | 1990 | 70.485365853658 | 1989 | 69.085365853659 | 1988 | 69.453658536585 | 1987 | 69.426829268293 | 1986 | 69.063414634146 | 1985 | 68.765853658537 | 1984 | 68.063414634146 | 1983 | 68.587804878049 | 1982 | 66.919512195122 | 1981 | 66.70243902439 | 1980 | 66.569512195122 | 1979 | 66.436585365854 | 1978 | 66.303658536585 | 1977 | 66.170731707317 | 1976 | 65.721951219512 | 1975 | 65.273170731707 | 1974 | 64.824390243902 | 1973 | 64.375609756098 | 1972 | 63.926829268293 | 1971 | 63.478048780488 | 1970 | 63.029268292683 | 1969 | 62.580487804878 | 1968 | 62.131707317073 | 1967 | 61.682926829268 | 1966 | 61.234146341463 | 1965 | 60.785365853658 | 1964 | 60.336585365854 | 1963 | 59.887804878049 | 1962 | 59.439024390244 | 1961 | 59.039024390244 | 1960 | 58.639024390244 |
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