Year | Value | 2021 | 21.524 | 2020 | 22.431 | 2019 | 23.298 | 2018 | 24.074 | 2017 | 24.755 | 2016 | 25.166 | 2015 | 25.405 | 2014 | 25.404 | 2013 | 25.236 | 2012 | 25.382 | 2011 | 24.815 | 2010 | 24.458 | 2009 | 24.051 | 2008 | 23.413 | 2007 | 22.65 | 2006 | 21.831 | 2005 | 21.166 | 2004 | 20.534 | 2003 | 19.959 | 2002 | 19.421 | 2001 | 19.433 | 2000 | 19.543 | 1999 | 19.68 | 1998 | 20.017 | 1997 | 21.154 | 1996 | 22.745 | 1995 | 24.758 | 1994 | 27.211 | 1993 | 28.43 | 1992 | 29.513 | 1991 | 30.031 | 1990 | 30.762 | 1989 | 32.386 | 1988 | 33.679 | 1987 | 35.242 | 1986 | 36.859 | 1985 | 38.71 | 1984 | 39.865 | 1983 | 41.088 | 1982 | 42.255 | 1981 | 43.088 | 1980 | 43.703 | 1979 | 43.64 | 1978 | 43.915 | 1977 | 44.311 | 1976 | 44.91 | 1975 | 45.404 | 1974 | 45.66 | 1973 | 45.86 | 1972 | 46.156 | 1971 | 46.515 | 1970 | 46.8 | 1969 | 46.988 | 1968 | 47.108 | 1967 | 47.374 | 1966 | 47.628 | 1965 | 48.021 | 1964 | 48.392 | 1963 | 48.593 | 1962 | 48.68 | 1961 | 48.634 | 1960 | 48.722 |
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