Year | Value | 2021 | 21.592 | 2020 | 22.294 | 2019 | 23.055 | 2018 | 23.845 | 2017 | 24.648 | 2016 | 25.424 | 2015 | 26.071 | 2014 | 26.502 | 2013 | 26.627 | 2012 | 26.452 | 2011 | 25.969 | 2010 | 25.273 | 2009 | 24.458 | 2008 | 23.675 | 2007 | 23.038 | 2006 | 22.644 | 2005 | 22.335 | 2004 | 22.043 | 2003 | 22.055 | 2002 | 22.103 | 2001 | 22.844 | 2000 | 23.709 | 1999 | 24.507 | 1998 | 25.39 | 1997 | 26.46 | 1996 | 27.573 | 1995 | 29.02 | 1994 | 30.409 | 1993 | 31.944 | 1992 | 32.894 | 1991 | 33.698 | 1990 | 34.854 | 1989 | 36.683 | 1988 | 37.818 | 1987 | 38.709 | 1986 | 38.666 | 1985 | 38.104 | 1984 | 37.087 | 1983 | 36.393 | 1982 | 35.667 | 1981 | 35.48 | 1980 | 35.368 | 1979 | 35.516 | 1978 | 35.601 | 1977 | 35.864 | 1976 | 36.035 | 1975 | 36.171 | 1974 | 36.407 | 1973 | 36.63 | 1972 | 36.893 | 1971 | 37.538 | 1970 | 38.014 | 1969 | 38.673 | 1968 | 39.576 | 1967 | 40.741 | 1966 | 42.134 | 1965 | 43.654 | 1964 | 45.15 | 1963 | 46.471 | 1962 | 47.473 | 1961 | 48.043 | 1960 | 48.126 |
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