Year | Value | 2021 | 81.239024390244 | 2020 | 81.192682926829 | 2019 | 81.895121951219 | 2018 | 81.692682926829 | 2017 | 81.643902439024 | 2016 | 81.641463414634 | 2015 | 81.190243902439 | 2014 | 81.490243902439 | 2013 | 81.136585365854 | 2012 | 80.936585365854 | 2011 | 80.982926829268 | 2010 | 80.580487804878 | 2009 | 80.331707317073 | 2008 | 80.431707317073 | 2007 | 80.180487804878 | 2006 | 79.880487804878 | 2005 | 79.331707317073 | 2004 | 79.180487804878 | 2003 | 78.631707317073 | 2002 | 78.678048780488 | 2001 | 78.575609756098 | 2000 | 78.126829268293 | 1999 | 77.875609756098 | 1998 | 77.670731707317 | 1997 | 77.319512195122 | 1996 | 76.870731707317 | 1995 | 76.668292682927 | 1994 | 76.419512195122 | 1993 | 76.068292682927 | 1992 | 75.817073170732 | 1991 | 75.617073170732 | 1990 | 75.568292682927 | 1989 | 75.265853658537 | 1988 | 75.217073170732 | 1987 | 74.768292682927 | 1986 | 74.317073170732 | 1985 | 73.814634146342 | 1984 | 73.612195121951 | 1983 | 73.012195121951 | 1982 | 72.960975609756 | 1981 | 72.812195121951 | 1980 | 72.463414634146 | 1979 | 72.312195121951 | 1978 | 72.012195121951 | 1977 | 71.914634146341 | 1976 | 71.565853658537 | 1975 | 71.114634146342 | 1974 | 71.012195121951 | 1973 | 71.014634146342 | 1972 | 70.463414634146 | 1971 | 70.114634146342 | 1970 | 69.914634146341 | 1969 | 69.833170731707 | 1968 | 70.05756097561 | 1967 | 69.917804878049 | 1966 | 70.045853658537 | 1965 | 69.722195121951 | 1964 | 69.921951219512 | 1963 | 69.443658536585 | 1962 | 69.309512195122 | 1961 | 69.577317073171 | 1960 | 68.585609756098 |
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