Year | Value | 2021 | 74.864 | 2020 | 74.314 | 2019 | 77.574 | 2018 | 77.286 | 2017 | 77.303 | 2016 | 77.486 | 2015 | 77.692 | 2014 | 77.782 | 2013 | 77.706 | 2012 | 77.535 | 2011 | 77.311 | 2010 | 77.117 | 2009 | 76.993 | 2008 | 76.952 | 2007 | 76.956 | 2006 | 76.981 | 2005 | 76.986 | 2004 | 76.983 | 2003 | 76.921 | 2002 | 76.826 | 2001 | 76.685 | 2000 | 76.512 | 1999 | 76.308 | 1998 | 76.082 | 1997 | 75.834 | 1996 | 75.566 | 1995 | 75.282 | 1994 | 74.99 | 1993 | 74.681 | 1992 | 74.357 | 1991 | 74.009 | 1990 | 73.647 | 1989 | 73.259 | 1988 | 72.862 | 1987 | 72.433 | 1986 | 71.983 | 1985 | 71.495 | 1984 | 70.963 | 1983 | 70.388 | 1982 | 69.798 | 1981 | 69.183 | 1980 | 68.576 | 1979 | 67.996 | 1978 | 67.45 | 1977 | 66.913 | 1976 | 66.386 | 1975 | 65.85 | 1974 | 65.288 | 1973 | 64.698 | 1972 | 64.093 | 1971 | 63.495 | 1970 | 62.918 | 1969 | 62.388 | 1968 | 61.91 | 1967 | 61.452 | 1966 | 60.99 | 1965 | 60.497 | 1964 | 59.938 | 1963 | 59.297 | 1962 | 58.584 | 1961 | 57.807 | 1960 | 56.973 |
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