Year | Value | 2021 | 21.813 | 2020 | 22.039 | 2019 | 22.254 | 2018 | 22.445 | 2017 | 22.664 | 2016 | 22.836 | 2015 | 23.252 | 2014 | 23.827 | 2013 | 24.286 | 2012 | 24.457 | 2011 | 24.416 | 2010 | 25.511 | 2009 | 26.148 | 2008 | 26.357 | 2007 | 26.607 | 2006 | 26.924 | 2005 | 27.019 | 2004 | 27.466 | 2003 | 27.986 | 2002 | 28.398 | 2001 | 28.84 | 2000 | 28.769 | 1999 | 29.318 | 1998 | 29.776 | 1997 | 30.166 | 1996 | 30.682 | 1995 | 31.288 | 1994 | 31.551 | 1993 | 32.108 | 1992 | 32.734 | 1991 | 33.177 | 1990 | 33.265 | 1989 | 33.342 | 1988 | 34.013 | 1987 | 34.155 | 1986 | 34.22 | 1985 | 34.888 | 1984 | 35.632 | 1983 | 36.204 | 1982 | 36.337 | 1981 | 36.489 | 1980 | 37.167 | 1979 | 37.717 | 1978 | 38.039 | 1977 | 37.768 | 1976 | 37.455 | 1975 | 37.566 | 1974 | 37.959 | 1973 | 38.526 | 1972 | 39.319 | 1971 | 40.016 | 1970 | 40.485 | 1969 | 40.884 | 1968 | 41.396 | 1967 | 42.121 | 1966 | 42.913 | 1965 | 43.68 | 1964 | 44.313 | 1963 | 44.929 | 1962 | 45.513 | 1961 | 46.051 | 1960 | 46.49 |
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