Year | Value | 2021 | 3.796 | 2020 | 3.025 | 2019 | 2.205 | 2018 | 2.172 | 2017 | 2.155 | 2016 | 2.154 | 2015 | 2.205 | 2014 | 2.243 | 2013 | 2.278 | 2012 | 2.323 | 2011 | 2.457 | 2010 | 2.585 | 2009 | 2.991 | 2008 | 2.973 | 2007 | 2.976 | 2006 | 2.928 | 2005 | 2.914 | 2004 | 2.896 | 2003 | 2.959 | 2002 | 3.041 | 2001 | 3.063 | 2000 | 3.156 | 1999 | 3.234 | 1998 | 3.285 | 1997 | 3.435 | 1996 | 3.494 | 1995 | 3.549 | 1994 | 3.73 | 1993 | 3.836 | 1992 | 4.054 | 1991 | 4.292 | 1990 | 4.541 | 1989 | 4.894 | 1988 | 5.279 | 1987 | 5.755 | 1986 | 6.358 | 1985 | 6.982 | 1984 | 7.627 | 1983 | 8.314 | 1982 | 9.1 | 1981 | 9.924 | 1980 | 10.702 | 1979 | 11.538 | 1978 | 12.446 | 1977 | 13.4 | 1976 | 14.092 | 1975 | 15.205 | 1974 | 16.007 | 1973 | 16.864 | 1972 | 17.776 | 1971 | 18.404 | 1970 | 19.385 | 1969 | 20.244 | 1968 | 21.249 | 1967 | 22.331 | 1966 | 23.422 | 1965 | 24.507 | 1964 | 25.621 | 1963 | 26.782 | 1962 | 27.925 | 1961 | 29.199 | 1960 | 30.49 |
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