Year | Value | 2021 | 14.857 | 2020 | 15.565 | 2019 | 15.71 | 2018 | 16.465 | 2017 | 16.947 | 2016 | 17.42 | 2015 | 17.968 | 2014 | 18.711 | 2013 | 19.326 | 2012 | 19.635 | 2011 | 19.917 | 2010 | 20.152 | 2009 | 20.442 | 2008 | 20.749 | 2007 | 21.082 | 2006 | 21.459 | 2005 | 21.9 | 2004 | 22.351 | 2003 | 22.802 | 2002 | 23.256 | 2001 | 23.717 | 2000 | 24.158 | 1999 | 24.618 | 1998 | 24.925 | 1997 | 25.511 | 1996 | 26.225 | 1995 | 26.87 | 1994 | 27.54 | 1993 | 28.144 | 1992 | 28.589 | 1991 | 28.943 | 1990 | 29.297 | 1989 | 29.77 | 1988 | 30.216 | 1987 | 31.04 | 1986 | 31.944 | 1985 | 32.445 | 1984 | 32.807 | 1983 | 33.242 | 1982 | 33.952 | 1981 | 34.698 | 1980 | 35.452 | 1979 | 36.586 | 1978 | 37.891 | 1977 | 38.565 | 1976 | 39.495 | 1975 | 40.331 | 1974 | 41.352 | 1973 | 42.141 | 1972 | 42.757 | 1971 | 43.261 | 1970 | 43.906 | 1969 | 44.532 | 1968 | 44.996 | 1967 | 45.381 | 1966 | 45.834 | 1965 | 46.198 | 1964 | 46.509 | 1963 | 46.625 | 1962 | 46.728 | 1961 | 46.775 | 1960 | 46.953 |
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