Year | Value | 2021 | 74.746 | 2020 | 76.816 | 2019 | 78.497 | 2018 | 78.293 | 2017 | 78.1 | 2016 | 77.953 | 2015 | 77.743 | 2014 | 77.432 | 2013 | 77.083 | 2012 | 76.683 | 2011 | 76.298 | 2010 | 75.93 | 2009 | 75.673 | 2008 | 75.509 | 2007 | 75.296 | 2006 | 75.209 | 2005 | 75.015 | 2004 | 74.737 | 2003 | 74.361 | 2002 | 73.916 | 2001 | 73.423 | 2000 | 72.93 | 1999 | 72.309 | 1998 | 71.673 | 1997 | 71.211 | 1996 | 70.752 | 1995 | 70.253 | 1994 | 69.81 | 1993 | 69.361 | 1992 | 68.926 | 1991 | 68.197 | 1990 | 67.972 | 1989 | 67.34 | 1988 | 66.556 | 1987 | 65.766 | 1986 | 64.978 | 1985 | 64.245 | 1984 | 63.596 | 1983 | 63.002 | 1982 | 62.573 | 1981 | 62.208 | 1980 | 61.815 | 1979 | 61.411 | 1978 | 60.986 | 1977 | 60.55 | 1976 | 60.13 | 1975 | 59.701 | 1974 | 59.199 | 1973 | 58.719 | 1972 | 58.296 | 1971 | 57.625 | 1970 | 47.507 | 1969 | 56.568 | 1968 | 55.996 | 1967 | 55.418 | 1966 | 54.851 | 1965 | 54.336 | 1964 | 53.837 | 1963 | 53.325 | 1962 | 52.401 | 1961 | 52.238 | 1960 | 51.646 |
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