Year | Value | 2021 | 72.615 | 2020 | 72.889 | 2019 | 73.577 | 2018 | 73.232 | 2017 | 73.063 | 2016 | 72.987 | 2015 | 72.953 | 2014 | 72.867 | 2013 | 72.713 | 2012 | 72.514 | 2011 | 72.221 | 2010 | 72.093 | 2009 | 71.871 | 2008 | 71.658 | 2007 | 71.371 | 2006 | 71.165 | 2005 | 70.875 | 2004 | 70.331 | 2003 | 70.265 | 2002 | 69.923 | 2001 | 69.642 | 2000 | 69.423 | 1999 | 69.279 | 1998 | 69.096 | 1997 | 69.166 | 1996 | 69.097 | 1995 | 68.988 | 1994 | 68.792 | 1993 | 68.472 | 1992 | 68.084 | 1991 | 67.625 | 1990 | 67.11 | 1989 | 66.546 | 1988 | 65.951 | 1987 | 65.339 | 1986 | 64.727 | 1985 | 64.139 | 1984 | 63.602 | 1983 | 63.109 | 1982 | 62.648 | 1981 | 62.194 | 1980 | 61.754 | 1979 | 60.753 | 1978 | 60.822 | 1977 | 60.319 | 1976 | 59.791 | 1975 | 59.236 | 1974 | 58.65 | 1973 | 58.042 | 1972 | 57.417 | 1971 | 56.782 | 1970 | 56.145 | 1969 | 55.513 | 1968 | 54.894 | 1967 | 54.289 | 1966 | 53.666 | 1965 | 50.864 | 1964 | 52.542 | 1963 | 51.799 | 1962 | 51.411 | 1961 | 50.84 | 1960 | 50.264 |
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