Year | Value | 2022 | 23.637 | 2021 | 23.975 | 2020 | 24.314 | 2019 | 24.653 | 2018 | 24.992 | 2017 | 25.331 | 2016 | 25.671 | 2015 | 26.01 | 2014 | 26.349 | 2013 | 26.687 | 2012 | 27.025 | 2011 | 27.362 | 2010 | 27.698 | 2009 | 28.037 | 2008 | 28.378 | 2007 | 28.722 | 2006 | 29.068 | 2005 | 29.416 | 2004 | 29.767 | 2003 | 30.121 | 2002 | 30.476 | 2001 | 30.834 | 2000 | 31.101 | 1999 | 31.323 | 1998 | 31.546 | 1997 | 31.769 | 1996 | 31.993 | 1995 | 32.218 | 1994 | 32.443 | 1993 | 32.67 | 1992 | 32.944 | 1991 | 33.283 | 1990 | 33.623 | 1989 | 33.965 | 1988 | 34.308 | 1987 | 34.654 | 1986 | 35.001 | 1985 | 35.41 | 1984 | 35.901 | 1983 | 36.397 | 1982 | 36.896 | 1981 | 37.397 | 1980 | 37.9 | 1979 | 38.784 | 1978 | 39.674 | 1977 | 40.572 | 1976 | 41.474 | 1975 | 42.438 | 1974 | 43.481 | 1973 | 44.529 | 1972 | 45.581 | 1971 | 46.64 | 1970 | 47.7 | 1969 | 48.966 | 1968 | 50.232 | 1967 | 51.501 | 1966 | 52.767 | 1965 | 54.245 | 1964 | 56.013 | 1963 | 57.77 | 1962 | 59.506 | 1961 | 61.218 | 1960 | 62.9 |
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