Year | Value | 2021 | 81.460975609756 | 2020 | 81.358536585366 | 2019 | 82.112195121951 | 2018 | 81.812195121951 | 2017 | 81.760975609756 | 2016 | 81.560975609756 | 2015 | 81.509756097561 | 2014 | 81.707317073171 | 2013 | 81.30487804878 | 2012 | 81.104878048781 | 2011 | 81.204878048781 | 2010 | 80.70243902439 | 2009 | 80.548780487805 | 2008 | 80.251219512195 | 2007 | 80.09756097561 | 2006 | 79.69756097561 | 2005 | 79.346341463415 | 2004 | 79.095121951219 | 2003 | 78.492682926829 | 2002 | 78.292682926829 | 2001 | 78.190243902439 | 2000 | 77.987804878049 | 1999 | 77.836585365854 | 1998 | 77.882926829268 | 1997 | 77.794390243902 | 1996 | 77.435609756098 | 1995 | 77.404634146341 | 1994 | 77.375121951219 | 1993 | 76.916585365854 | 1992 | 77.217073170732 | 1991 | 77 | 1990 | 76.878048780488 | 1989 | 76.734146341463 | 1988 | 76.890243902439 | 1987 | 76.705121951219 | 1986 | 76.270487804878 | 1985 | 76.284634146342 | 1984 | 76.233170731707 | 1983 | 76.164146341463 | 1982 | 75.988536585366 | 1981 | 75.934390243902 | 1980 | 75.743170731707 | 1979 | 75.606097560976 | 1978 | 75.145121951219 | 1977 | 75.221463414634 | 1976 | 74.647073170732 | 1975 | 74.498780487805 | 1974 | 74.536829268293 | 1973 | 74.143902439024 | 1972 | 73.727073170732 | 1971 | 73.809512195122 | 1970 | 73.585609756098 | 1969 | 73.539512195122 | 1968 | 73.612682926829 | 1967 | 73.804146341463 | 1966 | 73.512926829268 | 1965 | 73.568780487805 | 1964 | 73.704146341463 | 1963 | 73.337073170732 | 1962 | 73.323902439024 | 1961 | 73.652682926829 | 1960 | 73.392682926829 |
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