Year | Value | 2021 | 78.771 | 2020 | 77.992 | 2019 | 78.909 | 2018 | 78.911 | 2017 | 78.796 | 2016 | 78.716 | 2015 | 78.555 | 2014 | 78.393 | 2013 | 78.254 | 2012 | 78.084 | 2011 | 77.833 | 2010 | 77.572 | 2009 | 76.932 | 2008 | 76.84 | 2007 | 76.61 | 2006 | 76.425 | 2005 | 76.211 | 2004 | 75.953 | 2003 | 75.22 | 2002 | 74.94 | 2001 | 74.62 | 2000 | 74.394 | 1999 | 74.082 | 1998 | 73.577 | 1997 | 73.407 | 1996 | 73.225 | 1995 | 72.806 | 1994 | 72.686 | 1993 | 72.171 | 1992 | 71.876 | 1991 | 71.301 | 1990 | 70.712 | 1989 | 70.383 | 1988 | 69.778 | 1987 | 69.187 | 1986 | 68.577 | 1985 | 67.968 | 1984 | 67.299 | 1983 | 66.611 | 1982 | 65.839 | 1981 | 65.133 | 1980 | 64.367 | 1979 | 63.326 | 1978 | 62.553 | 1977 | 61.436 | 1976 | 60.557 | 1975 | 59.593 | 1974 | 58.601 | 1973 | 57.555 | 1972 | 56.393 | 1971 | 55.361 | 1970 | 54.304 | 1969 | 53.432 | 1968 | 52.578 | 1967 | 51.723 | 1966 | 50.997 | 1965 | 50.309 | 1964 | 49.764 | 1963 | 49.204 | 1962 | 48.698 | 1961 | 48.034 | 1960 | 47.506 |
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