Year | Value | 2021 | 1.413 | 2020 | 1.433 | 2019 | 1.46 | 2018 | 1.569 | 2017 | 1.704 | 2016 | 1.835 | 2015 | 1.957 | 2014 | 2.027 | 2013 | 2.087 | 2012 | 2.138 | 2011 | 2.21 | 2010 | 2.296 | 2009 | 2.381 | 2008 | 2.496 | 2007 | 2.59 | 2006 | 2.669 | 2005 | 2.798 | 2004 | 2.893 | 2003 | 2.916 | 2002 | 3.078 | 2001 | 3.232 | 2000 | 3.414 | 1999 | 3.607 | 1998 | 3.853 | 1997 | 4.088 | 1996 | 4.369 | 1995 | 4.624 | 1994 | 4.866 | 1993 | 5.072 | 1992 | 5.267 | 1991 | 5.451 | 1990 | 5.604 | 1989 | 5.757 | 1988 | 5.88 | 1987 | 5.999 | 1986 | 6.103 | 1985 | 6.176 | 1984 | 6.262 | 1983 | 6.336 | 1982 | 6.402 | 1981 | 6.46 | 1980 | 6.511 | 1979 | 6.553 | 1978 | 6.584 | 1977 | 6.605 | 1976 | 6.616 | 1975 | 6.62 | 1974 | 6.618 | 1973 | 6.633 | 1972 | 6.639 | 1971 | 6.643 | 1970 | 6.65 | 1969 | 6.658 | 1968 | 6.664 | 1967 | 6.669 | 1966 | 6.674 | 1965 | 6.679 | 1964 | 6.682 | 1963 | 6.687 | 1962 | 6.692 | 1961 | 6.698 | 1960 | 6.704 |
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