Year | Value | 2022 | 22.709 | 2021 | 22.997 | 2020 | 23.281 | 2019 | 23.56 | 2018 | 23.836 | 2017 | 24.106 | 2016 | 24.372 | 2015 | 24.632 | 2014 | 24.887 | 2013 | 25.137 | 2012 | 25.381 | 2011 | 25.619 | 2010 | 25.851 | 2009 | 26.077 | 2008 | 26.296 | 2007 | 26.509 | 2006 | 26.724 | 2005 | 26.939 | 2004 | 27.155 | 2003 | 27.373 | 2002 | 27.591 | 2001 | 27.811 | 2000 | 28.031 | 1999 | 28.253 | 1998 | 28.476 | 1997 | 28.813 | 1996 | 29.295 | 1995 | 29.784 | 1994 | 30.276 | 1993 | 30.773 | 1992 | 31.274 | 1991 | 31.781 | 1990 | 32.291 | 1989 | 32.806 | 1988 | 33.324 | 1987 | 33.848 | 1986 | 34.374 | 1985 | 34.905 | 1984 | 35.439 | 1983 | 35.978 | 1982 | 36.519 | 1981 | 37.064 | 1980 | 37.612 | 1979 | 38.164 | 1978 | 38.719 | 1977 | 39.277 | 1976 | 39.836 | 1975 | 40.4 | 1974 | 41.447 | 1973 | 42.501 | 1972 | 43.561 | 1971 | 44.629 | 1970 | 45.702 | 1969 | 46.778 | 1968 | 47.855 | 1967 | 48.938 | 1966 | 50.02 | 1965 | 51.102 | 1964 | 52.182 | 1963 | 53.263 | 1962 | 54.339 | 1961 | 55.266 | 1960 | 55.956 |
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