Year | Value | 2021 | 82.207317073171 | 2020 | 82.256097560976 | 2019 | 82.056097560976 | 2018 | 81.707317073171 | 2017 | 81.858536585366 | 2016 | 81.658536585366 | 2015 | 81.61243902439 | 2014 | 81.456829268293 | 2013 | 81.404878048781 | 2012 | 81.407317073171 | 2011 | 81.156097560976 | 2010 | 80.904878048781 | 2009 | 80.70243902439 | 2008 | 80.351219512195 | 2007 | 80.151219512195 | 2006 | 80.048780487805 | 2005 | 79.851219512195 | 2004 | 79.548780487805 | 2003 | 79.146341463415 | 2002 | 78.846341463415 | 2001 | 78.692682926829 | 2000 | 78.636585365854 | 1999 | 77.890243902439 | 1998 | 78.085365853659 | 1997 | 77.334146341463 | 1996 | 76.787804878049 | 1995 | 76.734146341463 | 1994 | 76.882926829268 | 1993 | 76.434146341463 | 1992 | 76.124390243902 | 1991 | 76.031707317073 | 1990 | 75.378048780488 | 1989 | 74.824390243902 | 1988 | 74.424390243902 | 1987 | 74.178048780488 | 1986 | 74.121951219512 | 1985 | 73.829268292683 | 1984 | 74.370731707317 | 1983 | 73.775609756098 | 1982 | 73.724390243902 | 1981 | 73.621951219512 | 1980 | 72.829268292683 | 1979 | 73.068292682927 | 1978 | 73.019512195122 | 1977 | 72.168292682927 | 1976 | 72.421951219512 | 1975 | 72.219512195122 | 1974 | 71.924390243902 | 1973 | 71.668292682927 | 1972 | 71.829268292683 | 1971 | 71.773170731707 | 1970 | 71.273170731707 | 1969 | 71.473170731707 | 1968 | 71.124390243902 | 1967 | 71.473170731707 | 1966 | 71.124390243902 | 1965 | 71.226829268293 | 1964 | 71.329268292683 | 1963 | 71.280487804878 | 1962 | 71.231707317073 | 1961 | 70.985365853658 | 1960 | 71.236585365854 |
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