Year | Value | 2021 | 1.664 | 2020 | 1.6415 | 2019 | 1.706 | 2018 | 1.7295 | 2017 | 1.7655 | 2016 | 1.8205 | 2015 | 1.8435 | 2014 | 1.8625 | 2013 | 1.8575 | 2012 | 1.8805 | 2011 | 1.8945 | 2010 | 1.931 | 2009 | 2.002 | 2008 | 2.072 | 2007 | 2.12 | 2006 | 2.108 | 2005 | 2.057 | 2004 | 2.0515 | 2003 | 2.0475 | 2002 | 2.0205 | 2001 | 2.0305 | 2000 | 2.056 | 1999 | 2.0075 | 1998 | 1.999 | 1997 | 1.971 | 1996 | 1.976 | 1995 | 1.978 | 1994 | 2.0015 | 1993 | 2.0195 | 1992 | 2.046 | 1991 | 2.0625 | 1990 | 2.081 | 1989 | 2.014 | 1988 | 1.934 | 1987 | 1.872 | 1986 | 1.8375 | 1985 | 1.844 | 1984 | 1.8065 | 1983 | 1.799 | 1982 | 1.8275 | 1981 | 1.812 | 1980 | 1.8395 | 1979 | 1.808 | 1978 | 1.76 | 1977 | 1.79 | 1976 | 1.738 | 1975 | 1.774 | 1974 | 1.835 | 1973 | 1.879 | 1972 | 2.01 | 1971 | 2.266 | 1970 | 2.48 | 1969 | 2.456 | 1968 | 2.464 | 1967 | 2.558 | 1966 | 2.721 | 1965 | 2.913 | 1964 | 3.19 | 1963 | 3.319 | 1962 | 3.461 | 1961 | 3.62 | 1960 | 3.654 |
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