Year | Value | 2021 | 81.404878048781 | 2020 | 81.60243902439 | 2019 | 81.451219512195 | 2018 | 80.953658536585 | 2017 | 81.10243902439 | 2016 | 80.853658536585 | 2015 | 80.70243902439 | 2014 | 80.7 | 2013 | 80.3 | 2012 | 80.051219512195 | 2011 | 79.8 | 2010 | 79.1 | 2009 | 78.59756097561 | 2008 | 78.446341463415 | 2007 | 78.19512195122 | 2006 | 78.095121951219 | 2005 | 77.843902439024 | 2004 | 77.492682926829 | 2003 | 77.143902439024 | 2002 | 76.895121951219 | 2001 | 76.792682926829 | 2000 | 76.592682926829 | 1999 | 76.341463414634 | 1998 | 76.139024390244 | 1997 | 75.94512195122 | 1996 | 75.591463414634 | 1995 | 75.212682926829 | 1994 | 75.375121951219 | 1993 | 75.116829268293 | 1992 | 75.194146341463 | 1991 | 75.157804878049 | 1990 | 74.805365853659 | 1989 | 74.799756097561 | 1988 | 74.771707317073 | 1987 | 74.691219512195 | 1986 | 74.579756097561 | 1985 | 74.42756097561 | 1984 | 74.562195121951 | 1983 | 74.420487804878 | 1982 | 74.551219512195 | 1981 | 74.230487804878 | 1980 | 74.101707317073 | 1979 | 74.219268292683 | 1978 | 74.392926829268 | 1977 | 74.63243902439 | 1976 | 73.739756097561 | 1975 | 74.07512195122 | 1974 | 73.808292682927 | 1973 | 73.682195121951 | 1972 | 73.439024390244 | 1971 | 73.414634146341 | 1970 | 73.343414634146 | 1969 | 73.220975609756 | 1968 | 73.121463414634 | 1967 | 72.922195121951 | 1966 | 72.444146341463 | 1965 | 72.370731707317 | 1964 | 72.485121951219 | 1963 | 72.400487804878 | 1962 | 72.319756097561 | 1961 | 72.438292682927 | 1960 | 72.176585365854 |
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