Year | Value | 2021 | 11.49 | 2020 | 11.667 | 2019 | 11.834 | 2018 | 11.986 | 2017 | 12.114 | 2016 | 12.229 | 2015 | 12.321 | 2014 | 12.393 | 2013 | 12.444 | 2012 | 12.496 | 2011 | 12.55 | 2010 | 12.618 | 2009 | 12.864 | 2008 | 13.128 | 2007 | 13.426 | 2006 | 13.758 | 2005 | 14.185 | 2004 | 14.752 | 2003 | 15.488 | 2002 | 16.352 | 2001 | 17.369 | 2000 | 18.514 | 1999 | 19.776 | 1998 | 21.032 | 1997 | 22.223 | 1996 | 23.32 | 1995 | 24.308 | 1994 | 25.115 | 1993 | 25.865 | 1992 | 26.579 | 1991 | 27.279 | 1990 | 27.989 | 1989 | 28.794 | 1988 | 29.549 | 1987 | 30.367 | 1986 | 31.161 | 1985 | 32.01 | 1984 | 32.642 | 1983 | 33.361 | 1982 | 34.238 | 1981 | 34.968 | 1980 | 35.913 | 1979 | 36.408 | 1978 | 36.943 | 1977 | 37.243 | 1976 | 37.443 | 1975 | 37.5 | 1974 | 37.569 | 1973 | 37.644 | 1972 | 37.757 | 1971 | 38.019 | 1970 | 38.345 | 1969 | 39.162 | 1968 | 40.078 | 1967 | 41.03 | 1966 | 41.963 | 1965 | 42.898 | 1964 | 43.856 | 1963 | 44.844 | 1962 | 45.886 | 1961 | 46.918 | 1960 | 48.084 |
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