Year | Value | 2021 | 5.395 | 2020 | 5.487 | 2019 | 5.663 | 2018 | 5.739 | 2017 | 5.829 | 2016 | 5.921 | 2015 | 6.001 | 2014 | 6.048 | 2013 | 6.041 | 2012 | 6.072 | 2011 | 6.061 | 2010 | 6.056 | 2009 | 5.93 | 2008 | 5.876 | 2007 | 5.832 | 2006 | 5.793 | 2005 | 5.751 | 2004 | 5.718 | 2003 | 5.673 | 2002 | 5.645 | 2001 | 5.642 | 2000 | 5.512 | 1999 | 5.835 | 1998 | 5.635 | 1997 | 5.675 | 1996 | 5.725 | 1995 | 6.01 | 1994 | 6.095 | 1993 | 6.214 | 1992 | 6.314 | 1991 | 6.406 | 1990 | 6.635 | 1989 | 6.852 | 1988 | 6.893 | 1987 | 7.544 | 1986 | 7.315 | 1985 | 7.68 | 1984 | 7.827 | 1983 | 8.138 | 1982 | 8.471 | 1981 | 8.823 | 1980 | 9.198 | 1979 | 8.183 | 1978 | 8.1 | 1977 | 8.458 | 1976 | 8.82 | 1975 | 9.218 | 1974 | 9.65 | 1973 | 10.107 | 1972 | 10.652 | 1971 | 11.112 | 1970 | 11.626 | 1969 | 12.155 | 1968 | 12.637 | 1967 | 13.127 | 1966 | 13.614 | 1965 | 14.109 | 1964 | 14.636 | 1963 | 15.102 | 1962 | 15.624 | 1961 | 16.138 | 1960 | 16.655 |
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