Year | Value | 2021 | 69.662 | 2020 | 70.983 | 2019 | 70.828 | 2018 | 70.299 | 2017 | 70.782 | 2016 | 70.879 | 2015 | 71.052 | 2014 | 70.963 | 2013 | 70.78 | 2012 | 70.635 | 2011 | 70.078 | 2010 | 69.309 | 2009 | 69.51 | 2008 | 68.192 | 2007 | 68.586 | 2006 | 68.271 | 2005 | 67.866 | 2004 | 67.722 | 2003 | 66.686 | 2002 | 67.201 | 2001 | 66.781 | 2000 | 66.453 | 1999 | 66.064 | 1998 | 66.474 | 1997 | 66.525 | 1996 | 66.156 | 1995 | 66.701 | 1994 | 65.77 | 1993 | 66.385 | 1992 | 66.007 | 1991 | 66.342 | 1990 | 66.122 | 1989 | 65.777 | 1988 | 66.086 | 1987 | 65.433 | 1986 | 65.841 | 1985 | 64.998 | 1984 | 65.081 | 1983 | 65.499 | 1982 | 64.844 | 1981 | 65.411 | 1980 | 65.252 | 1979 | 65.181 | 1978 | 65.403 | 1977 | 64.234 | 1976 | 63.526 | 1975 | 64.417 | 1974 | 64.922 | 1973 | 63.324 | 1972 | 63.044 | 1971 | 63.125 | 1970 | 63.008 | 1969 | 62.718 | 1968 | 62.781 | 1967 | 62.571 | 1966 | 62.325 | 1965 | 62.144 | 1964 | 61.878 | 1963 | 61.76 | 1962 | 61.568 | 1961 | 61.159 | 1960 | 61.089 |
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