Year | Value | 2022 | 71.7 | 2021 | 71.395 | 2020 | 71.09 | 2019 | 70.786 | 2018 | 70.483 | 2017 | 70.181 | 2016 | 69.88 | 2015 | 69.579 | 2014 | 69.28 | 2013 | 68.982 | 2012 | 68.685 | 2011 | 68.389 | 2010 | 68.094 | 2009 | 67.799 | 2008 | 67.502 | 2007 | 67.203 | 2006 | 66.903 | 2005 | 66.601 | 2004 | 66.299 | 2003 | 65.994 | 2002 | 65.689 | 2001 | 65.382 | 2000 | 65.265 | 1999 | 65.179 | 1998 | 65.092 | 1997 | 65.005 | 1996 | 64.918 | 1995 | 64.831 | 1994 | 64.744 | 1993 | 64.656 | 1992 | 64.569 | 1991 | 64.482 | 1990 | 63.079 | 1989 | 61.45 | 1988 | 59.798 | 1987 | 58.118 | 1986 | 56.422 | 1985 | 54.71 | 1984 | 52.99 | 1983 | 51.257 | 1982 | 49.524 | 1981 | 47.793 | 1980 | 46.759 | 1979 | 45.935 | 1978 | 45.115 | 1977 | 44.297 | 1976 | 43.484 | 1975 | 42.671 | 1974 | 41.864 | 1973 | 41.061 | 1972 | 40.264 | 1971 | 39.47 | 1970 | 38.683 | 1969 | 38.448 | 1968 | 38.381 | 1967 | 38.314 | 1966 | 38.247 | 1965 | 38.18 | 1964 | 38.113 | 1963 | 38.046 | 1962 | 37.979 | 1961 | 37.912 | 1960 | 37.846 |
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