Year | Value | 2021 | 1.575 | 2020 | 1.575 | 2019 | 1.575 | 2018 | 1.572 | 2017 | 1.562 | 2016 | 1.626 | 2015 | 1.602 | 2014 | 1.703 | 2013 | 1.6 | 2012 | 1.6 | 2011 | 1.5 | 2010 | 1.501 | 2009 | 1.551 | 2008 | 1.441 | 2007 | 1.418 | 2006 | 1.349 | 2005 | 1.54 | 2004 | 1.541 | 2003 | 1.534 | 2002 | 1.525 | 2001 | 1.544 | 2000 | 1.603 | 1999 | 1.709 | 1998 | 1.791 | 1997 | 1.892 | 1996 | 1.97 | 1995 | 2.055 | 1994 | 2.167 | 1993 | 2.315 | 1992 | 2.508 | 1991 | 2.645 | 1990 | 2.713 | 1989 | 2.706 | 1988 | 2.68 | 1987 | 2.66 | 1986 | 2.649 | 1985 | 2.649 | 1984 | 2.629 | 1983 | 2.572 | 1982 | 2.503 | 1981 | 2.499 | 1980 | 2.505 | 1979 | 2.557 | 1978 | 2.656 | 1977 | 2.76 | 1976 | 2.851 | 1975 | 2.957 | 1974 | 3.051 | 1973 | 3.155 | 1972 | 3.27 | 1971 | 3.357 | 1970 | 3.402 | 1969 | 3.488 | 1968 | 3.622 | 1967 | 3.731 | 1966 | 3.829 | 1965 | 3.988 | 1964 | 4.15 | 1963 | 4.345 | 1962 | 4.521 | 1961 | 4.67 | 1960 | 4.786 |
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