Year | Value | 2022 | 1.847 | 2021 | 1.883 | 2020 | 1.921 | 2019 | 1.959 | 2018 | 1.999 | 2017 | 2.039 | 2016 | 2.081 | 2015 | 2.124 | 2014 | 2.167 | 2013 | 2.211 | 2012 | 2.256 | 2011 | 2.302 | 2010 | 2.349 | 2009 | 2.397 | 2008 | 2.445 | 2007 | 2.495 | 2006 | 2.546 | 2005 | 2.597 | 2004 | 2.65 | 2003 | 2.704 | 2002 | 2.759 | 2001 | 2.814 | 2000 | 2.871 | 1999 | 2.935 | 1998 | 3.004 | 1997 | 3.076 | 1996 | 3.149 | 1995 | 3.223 | 1994 | 3.3 | 1993 | 3.378 | 1992 | 3.458 | 1991 | 3.539 | 1990 | 3.623 | 1989 | 3.708 | 1988 | 3.796 | 1987 | 3.885 | 1986 | 3.977 | 1985 | 4.07 | 1984 | 4.165 | 1983 | 4.263 | 1982 | 4.363 | 1981 | 4.465 | 1980 | 4.619 | 1979 | 4.804 | 1978 | 4.995 | 1977 | 5.194 | 1976 | 5.4 | 1975 | 5.52 | 1974 | 5.642 | 1973 | 5.767 | 1972 | 5.894 | 1971 | 6.024 | 1970 | 6.157 | 1969 | 6.293 | 1968 | 6.431 | 1967 | 6.572 | 1966 | 6.716 | 1965 | 6.863 | 1964 | 7.012 | 1963 | 7.165 | 1962 | 7.321 | 1961 | 7.446 | 1960 | 7.54 |
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