Year | Value | 2021 | 1.35 | 2020 | 1.359 | 2019 | 1.368 | 2018 | 1.384 | 2017 | 1.355 | 2016 | 1.324 | 2015 | 1.289 | 2014 | 1.262 | 2013 | 1.276 | 2012 | 1.29 | 2011 | 1.216 | 2010 | 1.276 | 2009 | 1.299 | 2008 | 1.276 | 2007 | 1.252 | 2006 | 1.186 | 2005 | 1.203 | 2004 | 1.219 | 2003 | 1.22 | 2002 | 1.23 | 2001 | 1.232 | 2000 | 1.283 | 1999 | 1.37 | 1998 | 1.554 | 1997 | 1.677 | 1996 | 1.651 | 1995 | 1.676 | 1994 | 1.705 | 1993 | 1.741 | 1992 | 1.773 | 1991 | 1.798 | 1990 | 1.794 | 1989 | 1.821 | 1988 | 1.873 | 1987 | 1.911 | 1986 | 1.951 | 1985 | 2.002 | 1984 | 2.051 | 1983 | 2.085 | 1982 | 2.095 | 1981 | 2.073 | 1980 | 2.034 | 1979 | 2.039 | 1978 | 2.095 | 1977 | 2.175 | 1976 | 2.271 | 1975 | 2.36 | 1974 | 2.451 | 1973 | 2.556 | 1972 | 2.664 | 1971 | 2.748 | 1970 | 2.828 | 1969 | 2.941 | 1968 | 3.047 | 1967 | 3.171 | 1966 | 3.308 | 1965 | 3.439 | 1964 | 3.538 | 1963 | 3.644 | 1962 | 3.737 | 1961 | 3.826 | 1960 | 3.907 |
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