Year | Value | 2021 | 1.321 | 2020 | 1.328 | 2019 | 1.332 | 2018 | 1.32 | 2017 | 1.322 | 2016 | 1.36 | 2015 | 1.326 | 2014 | 1.315 | 2013 | 1.305 | 2012 | 1.386 | 2011 | 1.36 | 2010 | 1.438 | 2009 | 1.481 | 2008 | 1.48 | 2007 | 1.451 | 2006 | 1.515 | 2005 | 1.48 | 2004 | 1.517 | 2003 | 1.509 | 2002 | 1.498 | 2001 | 1.563 | 2000 | 1.637 | 1999 | 1.674 | 1998 | 1.764 | 1997 | 1.858 | 1996 | 1.953 | 1995 | 2.033 | 1994 | 2.167 | 1993 | 2.247 | 1992 | 2.461 | 1991 | 2.336 | 1990 | 2.405 | 1989 | 2.371 | 1988 | 2.477 | 1987 | 2.389 | 1986 | 2.457 | 1985 | 2.434 | 1984 | 2.516 | 1983 | 2.499 | 1982 | 2.467 | 1981 | 2.154 | 1980 | 2.298 | 1979 | 2.136 | 1978 | 2.079 | 1977 | 2.089 | 1976 | 2.327 | 1975 | 2.107 | 1974 | 2.28 | 1973 | 2.403 | 1972 | 2.988 | 1971 | 3.036 | 1970 | 3.065 | 1969 | 3.188 | 1968 | 3.267 | 1967 | 3.324 | 1966 | 3.395 | 1965 | 3.47 | 1964 | 3.409 | 1963 | 3.494 | 1962 | 3.51 | 1961 | 3.619 | 1960 | 3.512 |
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