Year | Value | 2021 | 21.973 | 2020 | 22.449 | 2019 | 22.786 | 2018 | 23.238 | 2017 | 23.715 | 2016 | 24.131 | 2015 | 24.445 | 2014 | 24.698 | 2013 | 25.245 | 2012 | 25.811 | 2011 | 26.467 | 2010 | 27.042 | 2009 | 27.768 | 2008 | 28.313 | 2007 | 28.848 | 2006 | 29.141 | 2005 | 29.254 | 2004 | 29.873 | 2003 | 30.24 | 2002 | 30.872 | 2001 | 31.902 | 2000 | 32.991 | 1999 | 34.482 | 1998 | 35.019 | 1997 | 36.08 | 1996 | 37.18 | 1995 | 38.349 | 1994 | 39.612 | 1993 | 40.849 | 1992 | 41.515 | 1991 | 42.138 | 1990 | 42.494 | 1989 | 42.78 | 1988 | 43.006 | 1987 | 43.254 | 1986 | 43.45 | 1985 | 43.565 | 1984 | 43.604 | 1983 | 43.49 | 1982 | 43.399 | 1981 | 43.309 | 1980 | 43.327 | 1979 | 43.458 | 1978 | 43.677 | 1977 | 43.992 | 1976 | 44.271 | 1975 | 44.46 | 1974 | 44.563 | 1973 | 44.509 | 1972 | 44.496 | 1971 | 44.544 | 1970 | 44.621 | 1969 | 44.538 | 1968 | 44.513 | 1967 | 44.579 | 1966 | 44.605 | 1965 | 44.71 | 1964 | 44.752 | 1963 | 44.888 | 1962 | 44.995 | 1961 | 45.16 | 1960 | 45.247 |
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