Year | Value | 2021 | 2.864 | 2020 | 2.913 | 2019 | 2.656 | 2018 | 2.655 | 2017 | 2.64 | 2016 | 2.605 | 2015 | 2.542 | 2014 | 2.488 | 2013 | 2.443 | 2012 | 2.415 | 2011 | 2.413 | 2010 | 2.498 | 2009 | 2.59 | 2008 | 2.643 | 2007 | 2.719 | 2006 | 2.797 | 2005 | 2.879 | 2004 | 2.966 | 2003 | 3.113 | 2002 | 3.207 | 2001 | 3.323 | 2000 | 3.482 | 1999 | 3.585 | 1998 | 3.674 | 1997 | 3.804 | 1996 | 3.882 | 1995 | 3.982 | 1994 | 4.109 | 1993 | 4.265 | 1992 | 4.421 | 1991 | 4.65 | 1990 | 4.849 | 1989 | 5.074 | 1988 | 5.331 | 1987 | 5.613 | 1986 | 5.887 | 1985 | 6.207 | 1984 | 6.558 | 1983 | 6.924 | 1982 | 7.348 | 1981 | 7.819 | 1980 | 8.301 | 1979 | 8.901 | 1978 | 9.463 | 1977 | 10.12 | 1976 | 10.842 | 1975 | 11.533 | 1974 | 12.246 | 1973 | 13.016 | 1972 | 13.836 | 1971 | 14.59 | 1970 | 15.373 | 1969 | 16.08 | 1968 | 16.792 | 1967 | 17.478 | 1966 | 18.054 | 1965 | 18.542 | 1964 | 19.071 | 1963 | 19.525 | 1962 | 19.973 | 1961 | 20.492 | 1960 | 20.963 |
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