Year | Value | 2021 | 82.10243902439 | 2020 | 82.556097560976 | 2019 | 82.70243902439 | 2018 | 82.204878048781 | 2017 | 82.156097560976 | 2016 | 81.653658536585 | 2015 | 81.453658536585 | 2014 | 81.348780487805 | 2013 | 80.948780487805 | 2012 | 80.846341463415 | 2011 | 80.746341463415 | 2010 | 80.743902439024 | 2009 | 80.190243902439 | 2008 | 80.095121951219 | 2007 | 79.641463414634 | 2006 | 79.241463414634 | 2005 | 78.943902439024 | 2004 | 78.539024390244 | 2003 | 78.139024390244 | 2002 | 77.634146341463 | 2001 | 77.134146341463 | 2000 | 76.536585365854 | 1999 | 76.082926829268 | 1998 | 76.180487804878 | 1997 | 75.985365853658 | 1996 | 75.831707317073 | 1995 | 75.469804878049 | 1994 | 75.78712195122 | 1993 | 75.292195121951 | 1992 | 75.415097560976 | 1991 | 75.025 | 1990 | 74.846073170732 | 1989 | 74.455219512195 | 1988 | 74.439414634146 | 1987 | 74.432390243902 | 1986 | 73.665536585366 | 1985 | 73.621902439024 | 1984 | 73.663731707317 | 1983 | 73.240097560976 | 1982 | 73.209048780488 | 1981 | 72.951780487805 | 1980 | 72.595414634146 | 1979 | 72.268024390244 | 1978 | 71.996317073171 | 1977 | 71.997390243902 | 1976 | 71.856609756098 | 1975 | 71.753048780488 | 1974 | 71.17556097561 | 1973 | 71.239975609756 | 1972 | 71.021756097561 | 1971 | 71.675853658537 | 1970 | 70.90156097561 | 1969 | 70.852829268293 | 1968 | 70.941 | 1967 | 71.245365853658 | 1966 | 70.216951219512 | 1965 | 70.695 | 1964 | 70.489926829268 | 1963 | 70.230097560976 | 1962 | 69.991048780488 | 1961 | 69.678292682927 | 1960 | 70.194268292683 |
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