Year | Value | 2022 | 16.508 | 2021 | 16.635 | 2020 | 16.755 | 2019 | 16.868 | 2018 | 16.975 | 2017 | 17.075 | 2016 | 17.168 | 2015 | 17.254 | 2014 | 17.332 | 2013 | 17.404 | 2012 | 17.468 | 2011 | 17.524 | 2010 | 17.573 | 2009 | 17.615 | 2008 | 17.657 | 2007 | 17.698 | 2006 | 17.74 | 2005 | 17.782 | 2004 | 17.824 | 2003 | 17.866 | 2002 | 17.908 | 2001 | 17.951 | 2000 | 17.993 | 1999 | 18.176 | 1998 | 18.389 | 1997 | 18.604 | 1996 | 18.82 | 1995 | 19.039 | 1994 | 19.26 | 1993 | 19.482 | 1992 | 19.707 | 1991 | 19.933 | 1990 | 20.162 | 1989 | 20.716 | 1988 | 21.346 | 1987 | 21.993 | 1986 | 22.653 | 1985 | 23.326 | 1984 | 24.013 | 1983 | 24.715 | 1982 | 25.429 | 1981 | 26.157 | 1980 | 26.898 | 1979 | 27.516 | 1978 | 28.121 | 1977 | 28.734 | 1976 | 29.353 | 1975 | 29.983 | 1974 | 30.619 | 1973 | 31.262 | 1972 | 31.912 | 1971 | 32.571 | 1970 | 33.236 | 1969 | 33.907 | 1968 | 34.584 | 1967 | 35.27 | 1966 | 35.96 | 1965 | 36.657 | 1964 | 37.358 | 1963 | 38.074 | 1962 | 38.807 | 1961 | 39.546 | 1960 | 40.288 |
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