Year | Value | 2021 | 16.419 | 2020 | 16.572 | 2019 | 17.049 | 2018 | 17.651 | 2017 | 17.911 | 2016 | 18.514 | 2015 | 18.765 | 2014 | 19.049 | 2013 | 19.935 | 2012 | 20.421 | 2011 | 20.945 | 2010 | 21.438 | 2009 | 21.934 | 2008 | 22.276 | 2007 | 22.713 | 2006 | 23.22 | 2005 | 23.94 | 2004 | 24.728 | 2003 | 25.375 | 2002 | 26.082 | 2001 | 26.728 | 2000 | 27.001 | 1999 | 27.26 | 1998 | 27.784 | 1997 | 28.274 | 1996 | 28.786 | 1995 | 29.361 | 1994 | 29.841 | 1993 | 30.285 | 1992 | 30.914 | 1991 | 31.423 | 1990 | 31.816 | 1989 | 32.549 | 1988 | 33.166 | 1987 | 33.681 | 1986 | 34.483 | 1985 | 34.602 | 1984 | 35.094 | 1983 | 35.3 | 1982 | 35.605 | 1981 | 36.024 | 1980 | 36.214 | 1979 | 36.252 | 1978 | 36.383 | 1977 | 36.89 | 1976 | 37.665 | 1975 | 37.937 | 1974 | 38.629 | 1973 | 38.962 | 1972 | 39.173 | 1971 | 39.43 | 1970 | 39.533 | 1969 | 39.792 | 1968 | 40.207 | 1967 | 40.592 | 1966 | 40.918 | 1965 | 41.346 | 1964 | 41.721 | 1963 | 41.907 | 1962 | 42.101 | 1961 | 42.294 | 1960 | 42.506 |
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