Year | Value | 2021 | 25.514 | 2020 | 25.996 | 2019 | 26.37 | 2018 | 26.834 | 2017 | 27.216 | 2016 | 27.703 | 2015 | 28.178 | 2014 | 28.687 | 2013 | 29.122 | 2012 | 29.555 | 2011 | 30.028 | 2010 | 30.445 | 2009 | 30.771 | 2008 | 31.235 | 2007 | 31.606 | 2006 | 32.066 | 2005 | 32.507 | 2004 | 32.9 | 2003 | 33.386 | 2002 | 33.673 | 2001 | 33.91 | 2000 | 34.152 | 1999 | 34.443 | 1998 | 34.586 | 1997 | 34.737 | 1996 | 34.881 | 1995 | 35.04 | 1994 | 35.433 | 1993 | 35.779 | 1992 | 35.966 | 1991 | 36.275 | 1990 | 36.718 | 1989 | 36.956 | 1988 | 37.078 | 1987 | 37.161 | 1986 | 37.226 | 1985 | 37.279 | 1984 | 37.293 | 1983 | 37.294 | 1982 | 37.171 | 1981 | 37.261 | 1980 | 37.493 | 1979 | 37.973 | 1978 | 38.599 | 1977 | 39.242 | 1976 | 39.862 | 1975 | 40.487 | 1974 | 41.235 | 1973 | 42.035 | 1972 | 42.829 | 1971 | 43.283 | 1970 | 43.652 | 1969 | 43.921 | 1968 | 44.058 | 1967 | 44.145 | 1966 | 44.285 | 1965 | 44.238 | 1964 | 44.308 | 1963 | 44.297 | 1962 | 44.494 | 1961 | 44.433 | 1960 | 44.713 |
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