Year | Value | 2021 | 73.385 | 2020 | 76.156 | 2019 | 76.441 | 2018 | 76.342 | 2017 | 76.459 | 2016 | 76.413 | 2015 | 75.997 | 2014 | 75.668 | 2013 | 75.49 | 2012 | 75.248 | 2011 | 74.934 | 2010 | 74.766 | 2009 | 74.499 | 2008 | 74.316 | 2007 | 74.101 | 2006 | 73.924 | 2005 | 73.721 | 2004 | 73.815 | 2003 | 73.637 | 2002 | 73.432 | 2001 | 72.967 | 2000 | 72.688 | 1999 | 72.472 | 1998 | 72.194 | 1997 | 71.883 | 1996 | 71.746 | 1995 | 71.396 | 1994 | 71.076 | 1993 | 70.782 | 1992 | 70.422 | 1991 | 70.081 | 1990 | 69.749 | 1989 | 69.174 | 1988 | 68.964 | 1987 | 68.633 | 1986 | 68.26 | 1985 | 67.924 | 1984 | 67.544 | 1983 | 67.227 | 1982 | 66.993 | 1981 | 66.623 | 1980 | 66.354 | 1979 | 66.055 | 1978 | 65.764 | 1977 | 65.585 | 1976 | 65.343 | 1975 | 65.106 | 1974 | 64.903 | 1973 | 64.752 | 1972 | 64.658 | 1971 | 64.531 | 1970 | 64.421 | 1969 | 64.427 | 1968 | 64.309 | 1967 | 64.211 | 1966 | 64.097 | 1965 | 63.976 | 1964 | 63.798 | 1963 | 63.576 | 1962 | 63.322 | 1961 | 63.039 | 1960 | 62.732 |
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