Year | Value | 2021 | 1.99 | 2020 | 2 | 2019 | 2.019 | 2018 | 2.031 | 2017 | 2.053 | 2016 | 2.068 | 2015 | 2.091 | 2014 | 2.13 | 2013 | 2.181 | 2012 | 2.196 | 2011 | 2.206 | 2010 | 2.196 | 2009 | 2.224 | 2008 | 2.275 | 2007 | 2.327 | 2006 | 2.344 | 2005 | 2.283 | 2004 | 2.267 | 2003 | 2.276 | 2002 | 2.275 | 2001 | 2.261 | 2000 | 2.191 | 1999 | 2.138 | 1998 | 2.116 | 1997 | 2.182 | 1996 | 2.238 | 1995 | 2.295 | 1994 | 2.343 | 1993 | 2.406 | 1992 | 2.483 | 1991 | 2.5 | 1990 | 2.517 | 1989 | 2.558 | 1988 | 2.565 | 1987 | 2.657 | 1986 | 2.744 | 1985 | 2.879 | 1984 | 2.988 | 1983 | 3.093 | 1982 | 3.298 | 1981 | 3.576 | 1980 | 3.643 | 1979 | 3.74 | 1978 | 3.724 | 1977 | 3.676 | 1976 | 3.746 | 1975 | 3.792 | 1974 | 3.848 | 1973 | 4.033 | 1972 | 4.147 | 1971 | 4.242 | 1970 | 4.361 | 1969 | 4.5 | 1968 | 4.682 | 1967 | 4.855 | 1966 | 4.884 | 1965 | 5.004 | 1964 | 5.135 | 1963 | 5.211 | 1962 | 5.261 | 1961 | 5.331 | 1960 | 5.465 |
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