Year | Value | 2022 | 21.48 | 2021 | 21.838 | 2020 | 22.206 | 2019 | 22.583 | 2018 | 22.969 | 2017 | 23.366 | 2016 | 23.772 | 2015 | 24.189 | 2014 | 24.616 | 2013 | 25.054 | 2012 | 25.502 | 2011 | 25.962 | 2010 | 26.432 | 2009 | 26.907 | 2008 | 27.387 | 2007 | 27.874 | 2006 | 28.365 | 2005 | 28.862 | 2004 | 29.363 | 2003 | 29.87 | 2002 | 30.382 | 2001 | 30.899 | 2000 | 31.42 | 1999 | 31.947 | 1998 | 32.288 | 1997 | 32.615 | 1996 | 32.942 | 1995 | 33.273 | 1994 | 33.604 | 1993 | 33.937 | 1992 | 34.272 | 1991 | 34.608 | 1990 | 34.946 | 1989 | 35.286 | 1988 | 35.776 | 1987 | 36.53 | 1986 | 37.289 | 1985 | 38.055 | 1984 | 38.825 | 1983 | 39.604 | 1982 | 40.386 | 1981 | 41.174 | 1980 | 41.702 | 1979 | 41.231 | 1978 | 40.763 | 1977 | 40.296 | 1976 | 39.832 | 1975 | 39.368 | 1974 | 38.907 | 1973 | 38.788 | 1972 | 41.315 | 1971 | 43.897 | 1970 | 46.508 | 1969 | 49.139 | 1968 | 51.771 | 1967 | 54.4 | 1966 | 55.874 | 1965 | 57.337 | 1964 | 58.786 | 1963 | 60.224 | 1962 | 61.642 | 1961 | 63.041 | 1960 | 64.416 |
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