Year | Value | 2022 | 47.977 | 2021 | 47.684 | 2020 | 47.408 | 2019 | 47.149 | 2018 | 46.907 | 2017 | 46.682 | 2016 | 46.475 | 2015 | 46.284 | 2014 | 46.093 | 2013 | 45.903 | 2012 | 45.712 | 2011 | 45.522 | 2010 | 45.332 | 2009 | 45.371 | 2008 | 45.455 | 2007 | 45.54 | 2006 | 45.625 | 2005 | 45.71 | 2004 | 45.795 | 2003 | 45.88 | 2002 | 45.965 | 2001 | 46.05 | 2000 | 46.135 | 1999 | 46.22 | 1998 | 46.305 | 1997 | 46.39 | 1996 | 46.475 | 1995 | 46.56 | 1994 | 46.645 | 1993 | 46.73 | 1992 | 46.815 | 1991 | 46.901 | 1990 | 46.986 | 1989 | 46.172 | 1988 | 45.183 | 1987 | 44.195 | 1986 | 43.212 | 1985 | 42.235 | 1984 | 41.266 | 1983 | 40.3 | 1982 | 39.343 | 1981 | 38.394 | 1980 | 37.456 | 1979 | 36.997 | 1978 | 36.635 | 1977 | 36.275 | 1976 | 35.917 | 1975 | 35.56 | 1974 | 35.059 | 1973 | 34.533 | 1972 | 34.012 | 1971 | 33.493 | 1970 | 32.979 | 1969 | 32.672 | 1968 | 32.403 | 1967 | 32.135 | 1966 | 31.869 | 1965 | 31.604 | 1964 | 31.34 | 1963 | 31.077 | 1962 | 30.816 | 1961 | 30.555 | 1960 | 30.297 |
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