Year | Value | 2022 | 3.864 | 2021 | 3.96 | 2020 | 4.061 | 2019 | 4.168 | 2018 | 4.279 | 2017 | 4.397 | 2016 | 4.52 | 2015 | 4.65 | 2014 | 4.787 | 2013 | 4.93 | 2012 | 5.081 | 2011 | 5.239 | 2010 | 5.406 | 2009 | 5.581 | 2008 | 5.761 | 2007 | 5.947 | 2006 | 6.139 | 2005 | 6.336 | 2004 | 6.539 | 2003 | 6.749 | 2002 | 6.964 | 2001 | 7.186 | 2000 | 7.414 | 1999 | 7.772 | 1998 | 8.189 | 1997 | 8.626 | 1996 | 9.083 | 1995 | 9.563 | 1994 | 10.066 | 1993 | 10.591 | 1992 | 11.14 | 1991 | 11.715 | 1990 | 12.315 | 1989 | 12.941 | 1988 | 13.593 | 1987 | 14.274 | 1986 | 14.983 | 1985 | 15.72 | 1984 | 16.486 | 1983 | 17.283 | 1982 | 18.109 | 1981 | 18.966 | 1980 | 19.853 | 1979 | 20.772 | 1978 | 21.722 | 1977 | 22.702 | 1976 | 23.712 | 1975 | 24.755 | 1974 | 25.828 | 1973 | 26.93 | 1972 | 28.059 | 1971 | 29.221 | 1970 | 30.408 | 1969 | 31.622 | 1968 | 32.86 | 1967 | 34.126 | 1966 | 35.413 | 1965 | 36.721 | 1964 | 38.048 | 1963 | 39.396 | 1962 | 40.759 | 1961 | 42.136 | 1960 | 43.523 |
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