Year | Value | 2021 | 2.026 | 2020 | 2.051 | 2019 | 2.088 | 2018 | 2.133 | 2017 | 2.174 | 2016 | 2.201 | 2015 | 2.26 | 2014 | 2.335 | 2013 | 2.419 | 2012 | 2.517 | 2011 | 2.596 | 2010 | 2.615 | 2009 | 2.643 | 2008 | 2.675 | 2007 | 2.711 | 2006 | 2.753 | 2005 | 2.8 | 2004 | 2.853 | 2003 | 2.911 | 2002 | 2.972 | 2001 | 3.037 | 2000 | 3.102 | 1999 | 3.166 | 1998 | 3.228 | 1997 | 3.288 | 1996 | 3.345 | 1995 | 3.403 | 1994 | 3.461 | 1993 | 3.524 | 1992 | 3.591 | 1991 | 3.665 | 1990 | 3.744 | 1989 | 3.829 | 1988 | 3.917 | 1987 | 4.007 | 1986 | 4.1 | 1985 | 4.195 | 1984 | 4.293 | 1983 | 4.395 | 1982 | 4.501 | 1981 | 4.612 | 1980 | 4.73 | 1979 | 4.855 | 1978 | 4.989 | 1977 | 5.13 | 1976 | 5.276 | 1975 | 5.426 | 1974 | 5.577 | 1973 | 5.727 | 1972 | 5.873 | 1971 | 6.011 | 1970 | 6.138 | 1969 | 6.252 | 1968 | 6.351 | 1967 | 6.436 | 1966 | 6.507 | 1965 | 6.564 | 1964 | 6.61 | 1963 | 6.646 | 1962 | 6.676 | 1961 | 6.7 | 1960 | 6.721 |
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