Year | Value | 2022 | 31.665 | 2021 | 32.153 | 2020 | 32.646 | 2019 | 33.144 | 2018 | 33.645 | 2017 | 34.15 | 2016 | 34.659 | 2015 | 35.172 | 2014 | 35.688 | 2013 | 36.207 | 2012 | 36.728 | 2011 | 37.254 | 2010 | 37.782 | 2009 | 38.313 | 2008 | 38.846 | 2007 | 39.384 | 2006 | 39.923 | 2005 | 40.464 | 2004 | 41.007 | 2003 | 41.554 | 2002 | 42.102 | 2001 | 42.632 | 2000 | 43.109 | 1999 | 43.589 | 1998 | 44.07 | 1997 | 44.551 | 1996 | 45.033 | 1995 | 45.514 | 1994 | 45.996 | 1993 | 46.479 | 1992 | 46.962 | 1991 | 47.446 | 1990 | 47.963 | 1989 | 48.495 | 1988 | 49.028 | 1987 | 49.561 | 1986 | 50.095 | 1985 | 50.628 | 1984 | 50.912 | 1983 | 51.078 | 1982 | 51.244 | 1981 | 51.409 | 1980 | 51.575 | 1979 | 51.651 | 1978 | 51.711 | 1977 | 51.771 | 1976 | 51.831 | 1975 | 51.891 | 1974 | 51.951 | 1973 | 52.011 | 1972 | 52.071 | 1971 | 52.131 | 1970 | 52.191 | 1969 | 52.296 | 1968 | 52.41 | 1967 | 52.524 | 1966 | 52.638 | 1965 | 52.752 | 1964 | 52.866 | 1963 | 52.98 | 1962 | 53.094 | 1961 | 53.207 | 1960 | 53.381 |
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