Year | Value | 2021 | 72.960975609756 | 2020 | 74.253658536585 | 2019 | 75.607317073171 | 2018 | 75.358536585366 | 2017 | 75.309756097561 | 2016 | 75.209756097561 | 2015 | 74.912195121951 | 2014 | 74.909756097561 | 2013 | 75.063414634146 | 2012 | 74.412195121951 | 2011 | 74.409756097561 | 2010 | 73.458536585366 | 2009 | 73.309756097561 | 2008 | 72.565853658537 | 2007 | 72.565853658537 | 2006 | 72.163414634146 | 2005 | 71.912195121951 | 2004 | 71.560975609756 | 2003 | 71.309756097561 | 2002 | 71.009756097561 | 2001 | 71.160975609756 | 2000 | 71.163414634146 | 1999 | 70.512195121951 | 1998 | 69.807317073171 | 1997 | 69.00487804878 | 1996 | 69.104878048781 | 1995 | 69.456097560976 | 1994 | 69.509756097561 | 1993 | 69.563414634146 | 1992 | 69.784390243902 | 1991 | 69.784390243902 | 1990 | 69.741219512195 | 1989 | 69.530731707317 | 1988 | 69.388048780488 | 1987 | 69.226829268293 | 1986 | 69.496341463415 | 1985 | 69.706829268293 | 1984 | 69.658780487805 | 1983 | 69.726341463415 | 1982 | 69.531707317073 | 1981 | 69.368292682927 | 1980 | 69.090975609756 | 1979 | 69.153170731707 | 1978 | 69.480487804878 | 1977 | 69.741951219512 | 1976 | 69.698780487805 | 1975 | 69.613902439024 | 1974 | 69.499756097561 | 1973 | 69.005609756098 | 1972 | 68.470243902439 | 1971 | 68.504146341463 | 1970 | 67.482414634146 | 1969 | 66.692073170732 | 1968 | 67.560365853658 | 1967 | 67.515951219512 | 1966 | 68.897658536585 | 1965 | 67.707268292683 | 1964 | 67.845121951219 | 1963 | 67.071707317073 | 1962 | 65.255658536585 | 1961 | 65.877146341463 | 1960 | 65.860536585366 |
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