Year | Value | 2021 | 71.9 | 2020 | 71.8 | 2019 | 71.6 | 2018 | 71.4 | 2017 | 71.2 | 2016 | 70.951219512195 | 2015 | 70.651219512195 | 2014 | 70.40243902439 | 2013 | 70.20243902439 | 2012 | 70.00243902439 | 2011 | 69.60243902439 | 2010 | 69.3 | 2009 | 69.10243902439 | 2008 | 68.451219512195 | 2007 | 67.895121951219 | 2006 | 67.69512195122 | 2005 | 67.956097560976 | 2004 | 68.153658536585 | 2003 | 68.256097560976 | 2002 | 68.156097560976 | 2001 | 68.707317073171 | 2000 | 68.558536585366 | 1999 | 68.656097560976 | 1998 | 67.051219512195 | 1997 | 66.892682926829 | 1996 | 66.543902439024 | 1995 | 65.790243902439 | 1994 | 66.039024390244 | 1993 | 67.192682926829 | 1992 | 68.10243902439 | 1991 | 68.551219512195 | 1990 | 68.29756097561 | 1989 | 67.907317073171 | 1988 | 63.917390243902 | 1987 | 63.66043902439 | 1986 | 63.330414634146 | 1985 | 63.019512195122 | 1984 | 62.421195121951 | 1983 | 62.177073170732 | 1982 | 61.67443902439 | 1981 | 61.349195121951 | 1980 | 61.081463414634 | 1979 | 60.795024390244 | 1978 | 60.375609756098 | 1977 | 60.039756097561 | 1976 | 59.665585365854 | 1975 | 59.461756097561 | 1974 | 59.327048780488 | 1973 | 58.990682926829 | 1972 | 58.614756097561 | 1971 | 58.303926829268 | 1970 | 58.005317073171 | 1969 | 57.671536585366 | 1968 | 57.357463414634 | 1967 | 57.034317073171 | 1966 | 56.810146341463 | 1965 | 56.409487804878 | 1964 | 56.180341463415 | 1963 | 55.976951219512 | 1962 | 55.648926829268 | 1961 | 55.320951219512 | 1960 | 55.083024390244 |
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