Year | Value | 2022 | 70.83 | 2021 | 70.475 | 2020 | 70.123 | 2019 | 69.773 | 2018 | 69.425 | 2017 | 69.08 | 2016 | 68.738 | 2015 | 68.393 | 2014 | 68.047 | 2013 | 67.699 | 2012 | 67.315 | 2011 | 66.874 | 2010 | 66.43 | 2009 | 65.984 | 2008 | 65.535 | 2007 | 65.082 | 2006 | 64.628 | 2005 | 64.17 | 2004 | 63.711 | 2003 | 63.248 | 2002 | 62.783 | 2001 | 62.306 | 2000 | 61.787 | 1999 | 61.264 | 1998 | 60.739 | 1997 | 60.212 | 1996 | 59.682 | 1995 | 59.15 | 1994 | 58.615 | 1993 | 58.079 | 1992 | 57.541 | 1991 | 56.579 | 1990 | 55.577 | 1989 | 54.571 | 1988 | 53.563 | 1987 | 52.549 | 1986 | 51.535 | 1985 | 50.519 | 1984 | 49.504 | 1983 | 48.486 | 1982 | 47.472 | 1981 | 46.459 | 1980 | 45.451 | 1979 | 44.443 | 1978 | 43.442 | 1977 | 42.446 | 1976 | 41.624 | 1975 | 41.314 | 1974 | 41.004 | 1973 | 40.696 | 1972 | 40.389 | 1971 | 40.082 | 1970 | 39.776 | 1969 | 39.47 | 1968 | 39.166 | 1967 | 38.862 | 1966 | 38.559 | 1965 | 38.257 | 1964 | 37.957 | 1963 | 37.656 | 1962 | 37.357 | 1961 | 37.059 | 1960 | 36.762 |
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