Year | Value | 2021 | 81.934146341463 | 2020 | 81.931707317073 | 2019 | 81.982926829268 | 2018 | 81.734146341463 | 2017 | 81.631707317073 | 2016 | 81.429268292683 | 2015 | 81.480487804878 | 2014 | 81.180487804878 | 2013 | 80.975609756098 | 2012 | 80.626829268293 | 2011 | 80.470731707317 | 2010 | 79.870731707317 | 2009 | 79.719512195122 | 2008 | 79.568292682927 | 2007 | 79.263414634146 | 2006 | 79.214634146341 | 2005 | 78.817073170732 | 2004 | 78.714634146341 | 2003 | 78.368292682927 | 2002 | 78.119512195122 | 2001 | 77.965853658537 | 2000 | 77.465853658537 | 1999 | 77.291219512195 | 1998 | 77.090731707317 | 1997 | 76.878536585366 | 1996 | 76.693414634146 | 1995 | 76.409512195122 | 1994 | 76.395609756098 | 1993 | 75.705121951219 | 1992 | 75.455365853659 | 1991 | 75.22756097561 | 1990 | 74.813170731707 | 1989 | 74.792195121951 | 1988 | 74.577073170732 | 1987 | 74.591951219512 | 1986 | 74.56 | 1985 | 74.222926829268 | 1984 | 74.519024390244 | 1983 | 74.200975609756 | 1982 | 74.298048780488 | 1981 | 73.746585365854 | 1980 | 73.44 | 1979 | 73.155365853659 | 1978 | 72.897073170732 | 1977 | 72.350243902439 | 1976 | 71.812926829268 | 1975 | 71.673658536585 | 1974 | 71.13487804878 | 1973 | 71.223658536585 | 1972 | 70.707317073171 | 1971 | 70.01756097561 | 1970 | 70.179512195122 | 1969 | 69.503414634146 | 1968 | 69.616341463415 | 1967 | 69.666585365854 | 1966 | 69.477073170732 | 1965 | 68.977804878049 | 1964 | 69.220975609756 | 1963 | 69.012682926829 | 1962 | 68.577804878049 | 1961 | 68.844146341463 | 1960 | 68.819756097561 |
|