Year | Value | 2022 | 36.427 | 2021 | 36.569 | 2020 | 36.687 | 2019 | 36.781 | 2018 | 36.851 | 2017 | 36.897 | 2016 | 36.918 | 2015 | 36.915 | 2014 | 36.888 | 2013 | 36.836 | 2012 | 36.76 | 2011 | 36.66 | 2010 | 36.56 | 2009 | 36.46 | 2008 | 36.36 | 2007 | 36.261 | 2006 | 36.161 | 2005 | 36.062 | 2004 | 35.962 | 2003 | 35.863 | 2002 | 35.764 | 2001 | 35.615 | 2000 | 35.334 | 1999 | 35.053 | 1998 | 34.774 | 1997 | 34.496 | 1996 | 34.219 | 1995 | 33.943 | 1994 | 33.668 | 1993 | 33.394 | 1992 | 33.122 | 1991 | 32.85 | 1990 | 32.579 | 1989 | 32.31 | 1988 | 32.294 | 1987 | 32.499 | 1986 | 32.704 | 1985 | 32.91 | 1984 | 33.117 | 1983 | 33.325 | 1982 | 33.533 | 1981 | 33.741 | 1980 | 33.95 | 1979 | 34.161 | 1978 | 34.581 | 1977 | 35.179 | 1976 | 35.781 | 1975 | 36.389 | 1974 | 37 | 1973 | 37.775 | 1972 | 38.555 | 1971 | 39.343 | 1970 | 40.136 | 1969 | 40.958 | 1968 | 41.805 | 1967 | 42.659 | 1966 | 43.517 | 1965 | 44.378 | 1964 | 45.242 | 1963 | 46.111 | 1962 | 46.981 | 1961 | 47.853 | 1960 | 48.725 |
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