Year | Value | 2021 | 73.824390243902 | 2020 | 75.931707317073 | 2019 | 76.682926829268 | 2018 | 76.841463414634 | 2017 | 76.485365853658 | 2016 | 76.441463414634 | 2015 | 76.448780487805 | 2014 | 76.441463414634 | 2013 | 76.490243902439 | 2012 | 76.2 | 2011 | 75.982926829268 | 2010 | 75.990243902439 | 2009 | 75.143902439024 | 2008 | 75.136585365854 | 2007 | 74.339024390244 | 2006 | 73.839024390244 | 2005 | 73.982926829268 | 2004 | 74.563951219512 | 2003 | 73.931731707317 | 2002 | 73.906487804878 | 2001 | 74.069414634146 | 2000 | 73.818487804878 | 1999 | 72.640756097561 | 1998 | 73.314219512195 | 1997 | 73.479073170732 | 1996 | 73.463024390244 | 1995 | 74.109 | 1994 | 73.245536585366 | 1993 | 74.633292682927 | 1992 | 74.365365853659 | 1991 | 75.682609756098 | 1990 | 75.56687804878 | 1989 | 75.537902439024 | 1988 | 76.237536585366 | 1987 | 75.094414634146 | 1986 | 74.245463414634 | 1985 | 73.854365853659 | 1984 | 72.768268292683 | 1983 | 71.131682926829 | 1982 | 71.181146341463 | 1981 | 71.239780487805 | 1980 | 71.60912195122 | 1979 | 70.482829268293 | 1978 | 71.144926829268 | 1977 | 71.351536585366 | 1976 | 71.569951219512 | 1975 | 71.174243902439 | 1974 | 71.220756097561 | 1973 | 70.593073170732 | 1972 | 70.374195121951 | 1971 | 69.530170731707 | 1970 | 69.092195121951 | 1969 | 69.006609756098 | 1968 | 69.237682926829 | 1967 | 68.867975609756 | 1966 | 68.854682926829 | 1965 | 67.987365853659 | 1964 | 67.150536585366 | 1963 | 66.816219512195 | 1962 | 65.897975609756 | 1961 | 65.419121951219 | 1960 | 64.873609756098 |
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