Year | Value | 2021 | 34.425 | 2020 | 34.944 | 2019 | 35.436 | 2018 | 35.931 | 2017 | 36.625 | 2016 | 37.396 | 2015 | 37.891 | 2014 | 37.891 | 2013 | 38.134 | 2012 | 38.44 | 2011 | 38.902 | 2010 | 39.369 | 2009 | 39.729 | 2008 | 39.761 | 2007 | 39.801 | 2006 | 39.815 | 2005 | 39.921 | 2004 | 39.933 | 2003 | 40.125 | 2002 | 40.547 | 2001 | 41.003 | 2000 | 41.642 | 1999 | 42.245 | 1998 | 42.704 | 1997 | 43.716 | 1996 | 44.218 | 1995 | 44.429 | 1994 | 45.153 | 1993 | 45.866 | 1992 | 46.23 | 1991 | 46.385 | 1990 | 46.318 | 1989 | 46.451 | 1988 | 46.543 | 1987 | 46.561 | 1986 | 46.388 | 1985 | 46.259 | 1984 | 46.179 | 1983 | 46.129 | 1982 | 46.069 | 1981 | 45.872 | 1980 | 45.855 | 1979 | 45.907 | 1978 | 45.548 | 1977 | 45.408 | 1976 | 45.3 | 1975 | 45.325 | 1974 | 45.36 | 1973 | 45.424 | 1972 | 45.402 | 1971 | 45.412 | 1970 | 45.374 | 1969 | 45.32 | 1968 | 45.317 | 1967 | 45.339 | 1966 | 45.401 | 1965 | 45.471 | 1964 | 45.549 | 1963 | 45.605 | 1962 | 45.674 | 1961 | 45.683 | 1960 | 45.692 |
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