Year | Value | 2021 | 76.424390243902 | 2020 | 77.724390243902 | 2019 | 78.424390243902 | 2018 | 78.070731707317 | 2017 | 77.826829268293 | 2016 | 78.021951219512 | 2015 | 77.275609756098 | 2014 | 77.478048780488 | 2013 | 77.126829268293 | 2012 | 76.924390243902 | 2011 | 76.775609756098 | 2010 | 76.475609756098 | 2009 | 76.168292682927 | 2008 | 75.912195121951 | 2007 | 75.705609756098 | 2006 | 75.836829268293 | 2005 | 75.244634146341 | 2004 | 75.520243902439 | 2003 | 74.613902439024 | 2002 | 74.717317073171 | 2001 | 74.512926829268 | 2000 | 72.807804878049 | 1999 | 72.641951219512 | 1998 | 72.317073170732 | 1997 | 72.49512195122 | 1996 | 72.365365853659 | 1995 | 72.084390243902 | 1994 | 71.803414634146 | 1993 | 71.52243902439 | 1992 | 71.241463414634 | 1991 | 72.185365853659 | 1990 | 72.170487804878 | 1989 | 71.844634146342 | 1988 | 71.488292682927 | 1987 | 71.470243902439 | 1986 | 71.419024390244 | 1985 | 70.886097560976 | 1984 | 70.218536585366 | 1983 | 70.27487804878 | 1982 | 70.482682926829 | 1981 | 70.344390243902 | 1980 | 70.175365853659 | 1979 | 70.427317073171 | 1978 | 70.538780487805 | 1977 | 70.744390243902 | 1976 | 70.455365853659 | 1975 | 70.001951219512 | 1974 | 70.143658536585 | 1973 | 69.848487804878 | 1972 | 69.441780487805 | 1971 | 69.140170731707 | 1970 | 68.812634146341 | 1969 | 68.660292682927 | 1968 | 68.386414634146 | 1967 | 68.298951219512 | 1966 | 68.12143902439 | 1965 | 67.83256097561 | 1964 | 67.292317073171 | 1963 | 66.855804878049 | 1962 | 66.469146341463 | 1961 | 66.180341463415 | 1960 | 65.482365853658 |
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