Year | Value | 2021 | 75.817 | 2020 | 77.885 | 2019 | 77.791 | 2018 | 77.594 | 2017 | 79.119 | 2016 | 76.231 | 2015 | 76.427 | 2014 | 76.262 | 2013 | 76.017 | 2012 | 76.796 | 2011 | 77.138 | 2010 | 75.921 | 2009 | 76.827 | 2008 | 75.425 | 2007 | 75.137 | 2006 | 73.954 | 2005 | 74.349 | 2004 | 77.112 | 2003 | 77.079 | 2002 | 78.669 | 2001 | 75.701 | 2000 | 75.293 | 1999 | 75.83 | 1998 | 76.684 | 1997 | 74.358 | 1996 | 75.095 | 1995 | 72.616 | 1994 | 70.846 | 1993 | 70.464 | 1992 | 71.114 | 1991 | 70.96 | 1990 | 70.643 | 1989 | 70.77 | 1988 | 70.808 | 1987 | 70.004 | 1986 | 69.436 | 1985 | 70.245 | 1984 | 71.385 | 1983 | 70.14 | 1982 | 69.518 | 1981 | 69.829 | 1980 | 69.453 | 1979 | 69.9 | 1978 | 69.02 | 1977 | 68.316 | 1976 | 68.311 | 1975 | 68.908 | 1974 | 68.821 | 1973 | 68.424 | 1972 | 66.198 | 1971 | 64.812 | 1970 | 64.799 | 1969 | 64.665 | 1968 | 65.016 | 1967 | 64.388 | 1966 | 60.461 | 1965 | 65.375 | 1964 | 65.066 | 1963 | 63.027 | 1962 | 60.428 | 1961 | 62.054 | 1960 | 64.28 |
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