Year | Value | 2021 | 73.11 | 2020 | 72.597 | 2019 | 72.227 | 2018 | 71.983 | 2017 | 71.54 | 2016 | 71.407 | 2015 | 71.027 | 2014 | 70.698 | 2013 | 70.179 | 2012 | 69.981 | 2011 | 69.348 | 2010 | 69.217 | 2009 | 64.245 | 2008 | 66.682 | 2007 | 67.484 | 2006 | 67.462 | 2005 | 68.068 | 2004 | 63.968 | 2003 | 67.287 | 2002 | 67.012 | 2001 | 66.619 | 2000 | 66.216 | 1999 | 68.306 | 1998 | 67.584 | 1997 | 67.651 | 1996 | 67.911 | 1995 | 67.824 | 1994 | 68.865 | 1993 | 69.117 | 1992 | 68.375 | 1991 | 67.304 | 1990 | 67.739 | 1989 | 65.133 | 1988 | 67.586 | 1987 | 67.755 | 1986 | 68.057 | 1985 | 67.752 | 1984 | 67.549 | 1983 | 67.21 | 1982 | 66.926 | 1981 | 66.492 | 1980 | 66.029 | 1979 | 65.586 | 1978 | 65.422 | 1977 | 64.378 | 1976 | 64.349 | 1975 | 64.077 | 1974 | 63.88 | 1973 | 63.842 | 1972 | 63.755 | 1971 | 63.825 | 1970 | 63.077 | 1969 | 61.602 | 1968 | 61.51 | 1967 | 61.259 | 1966 | 61.028 | 1965 | 60.688 | 1964 | 60.395 | 1963 | 60.248 | 1962 | 60.125 | 1961 | 59.7 | 1960 | 59.14 |
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