Year | Value | 2022 | 21.292 | 2021 | 21.5 | 2020 | 21.703 | 2019 | 21.901 | 2018 | 22.093 | 2017 | 22.28 | 2016 | 22.461 | 2015 | 22.643 | 2014 | 22.827 | 2013 | 23.011 | 2012 | 23.196 | 2011 | 23.383 | 2010 | 23.57 | 2009 | 23.759 | 2008 | 23.948 | 2007 | 24.197 | 2006 | 24.579 | 2005 | 24.966 | 2004 | 25.356 | 2003 | 25.751 | 2002 | 26.15 | 2001 | 26.552 | 2000 | 26.958 | 1999 | 27.369 | 1998 | 27.784 | 1997 | 28.202 | 1996 | 28.623 | 1995 | 29.049 | 1994 | 29.479 | 1993 | 29.911 | 1992 | 30.303 | 1991 | 30.7 | 1990 | 31.099 | 1989 | 31.501 | 1988 | 31.905 | 1987 | 32.313 | 1986 | 32.723 | 1985 | 33.136 | 1984 | 33.551 | 1983 | 33.969 | 1982 | 34.39 | 1981 | 34.818 | 1980 | 35.426 | 1979 | 36.04 | 1978 | 36.659 | 1977 | 37.281 | 1976 | 37.907 | 1975 | 38.539 | 1974 | 39.173 | 1973 | 39.812 | 1972 | 40.453 | 1971 | 41.504 | 1970 | 42.594 | 1969 | 43.691 | 1968 | 44.793 | 1967 | 45.904 | 1966 | 47.017 | 1965 | 48.132 | 1964 | 49.248 | 1963 | 50.368 | 1962 | 51.486 | 1961 | 52.602 | 1960 | 53.189 |
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