Year | Value | 2021 | 6.131 | 2020 | 5.475 | 2019 | 5.499 | 2018 | 5.663 | 2017 | 5.994 | 2016 | 6.075 | 2015 | 6.158 | 2014 | 6.276 | 2013 | 6.393 | 2012 | 6.514 | 2011 | 6.741 | 2010 | 6.729 | 2009 | 6.808 | 2008 | 6.817 | 2007 | 6.843 | 2006 | 6.875 | 2005 | 6.992 | 2004 | 6.869 | 2003 | 7.005 | 2002 | 7.229 | 2001 | 7.238 | 2000 | 7.359 | 1999 | 7.502 | 1998 | 7.874 | 1997 | 8.395 | 1996 | 8.719 | 1995 | 8.636 | 1994 | 8.832 | 1993 | 9.162 | 1992 | 9.574 | 1991 | 10.016 | 1990 | 10.48 | 1989 | 10.89 | 1988 | 11.348 | 1987 | 11.778 | 1986 | 12.169 | 1985 | 12.31 | 1984 | 12.472 | 1983 | 12.808 | 1982 | 13.153 | 1981 | 13.265 | 1980 | 13.37 | 1979 | 13.512 | 1978 | 13.709 | 1977 | 13.909 | 1976 | 14.111 | 1975 | 14.107 | 1974 | 14.525 | 1973 | 15.049 | 1972 | 15.631 | 1971 | 16.297 | 1970 | 17.012 | 1969 | 17.774 | 1968 | 18.469 | 1967 | 19.195 | 1966 | 20.038 | 1965 | 20.745 | 1964 | 21.553 | 1963 | 22.421 | 1962 | 22.927 | 1961 | 23.502 | 1960 | 24.033 |
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