Year | Value | 2021 | 73.683 | 2020 | 77.567 | 2019 | 77.611 | 2018 | 77.496 | 2017 | 77.529 | 2016 | 77.643 | 2015 | 77.772 | 2014 | 77.853 | 2013 | 77.87 | 2012 | 77.833 | 2011 | 77.76 | 2010 | 77.661 | 2009 | 77.548 | 2008 | 77.429 | 2007 | 77.307 | 2006 | 77.179 | 2005 | 77.047 | 2004 | 76.912 | 2003 | 76.773 | 2002 | 76.612 | 2001 | 76.421 | 2000 | 76.183 | 1999 | 75.893 | 1998 | 75.564 | 1997 | 75.222 | 1996 | 74.903 | 1995 | 74.623 | 1994 | 74.411 | 1993 | 74.261 | 1992 | 74.162 | 1991 | 74.093 | 1990 | 74.039 | 1989 | 73.981 | 1988 | 73.913 | 1987 | 73.825 | 1986 | 73.725 | 1985 | 73.605 | 1984 | 73.468 | 1983 | 73.309 | 1982 | 73.13 | 1981 | 72.939 | 1980 | 72.752 | 1979 | 72.447 | 1978 | 72.201 | 1977 | 71.895 | 1976 | 71.524 | 1975 | 71.079 | 1974 | 70.57 | 1973 | 70.02 | 1972 | 69.462 | 1971 | 68.918 | 1970 | 68.398 | 1969 | 67.936 | 1968 | 67.511 | 1967 | 67.11 | 1966 | 66.715 | 1965 | 66.318 | 1964 | 65.905 | 1963 | 64.94 | 1962 | 65.038 | 1961 | 64.512 | 1960 | 64.173 |
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