Year | Value | 2021 | 34.938 | 2020 | 35.507 | 2019 | 36.147 | 2018 | 36.716 | 2017 | 37.403 | 2016 | 37.747 | 2015 | 37.807 | 2014 | 37.818 | 2013 | 38.237 | 2012 | 38.76 | 2011 | 39.368 | 2010 | 39.958 | 2009 | 40.33 | 2008 | 40.553 | 2007 | 40.786 | 2006 | 40.956 | 2005 | 41.088 | 2004 | 41.264 | 2003 | 41.191 | 2002 | 40.954 | 2001 | 40.775 | 2000 | 41.018 | 1999 | 41.287 | 1998 | 41.055 | 1997 | 41.07 | 1996 | 41.487 | 1995 | 42.09 | 1994 | 42.664 | 1993 | 43.102 | 1992 | 43.518 | 1991 | 43.864 | 1990 | 44.137 | 1989 | 44.371 | 1988 | 44.742 | 1987 | 45.168 | 1986 | 45.333 | 1985 | 45.218 | 1984 | 45.292 | 1983 | 45.609 | 1982 | 46.189 | 1981 | 46.122 | 1980 | 45.917 | 1979 | 45.797 | 1978 | 45.569 | 1977 | 45.445 | 1976 | 45.176 | 1975 | 44.935 | 1974 | 44.88 | 1973 | 44.941 | 1972 | 44.967 | 1971 | 45.121 | 1970 | 45.078 | 1969 | 45.068 | 1968 | 45.211 | 1967 | 45.323 | 1966 | 45.396 | 1965 | 45.409 | 1964 | 45.381 | 1963 | 45.321 | 1962 | 45.094 | 1961 | 44.677 | 1960 | 44.178 |
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