Year | Value | 2021 | 20.507 | 2020 | 20.903 | 2019 | 21.305 | 2018 | 21.704 | 2017 | 22.09 | 2016 | 22.459 | 2015 | 22.797 | 2014 | 23.103 | 2013 | 23.385 | 2012 | 23.647 | 2011 | 23.881 | 2010 | 24.105 | 2009 | 24.307 | 2008 | 24.502 | 2007 | 24.716 | 2006 | 24.945 | 2005 | 25.204 | 2004 | 25.576 | 2003 | 26.005 | 2002 | 26.473 | 2001 | 27.002 | 2000 | 27.61 | 1999 | 28.298 | 1998 | 29.047 | 1997 | 29.851 | 1996 | 30.823 | 1995 | 31.708 | 1994 | 32.665 | 1993 | 33.697 | 1992 | 34.593 | 1991 | 35.509 | 1990 | 36.317 | 1989 | 37.147 | 1988 | 38.009 | 1987 | 38.668 | 1986 | 39.41 | 1985 | 40.198 | 1984 | 40.93 | 1983 | 41.68 | 1982 | 42.482 | 1981 | 43.026 | 1980 | 43.652 | 1979 | 44.271 | 1978 | 44.772 | 1977 | 45.328 | 1976 | 45.849 | 1975 | 46.288 | 1974 | 46.614 | 1973 | 46.981 | 1972 | 47.248 | 1971 | 47.4 | 1970 | 47.465 | 1969 | 47.457 | 1968 | 47.602 | 1967 | 47.724 | 1966 | 47.799 | 1965 | 48.091 | 1964 | 48.424 | 1963 | 48.919 | 1962 | 49.339 | 1961 | 49.868 | 1960 | 50.359 |
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