Year | Value | 2021 | 1.43 | 2020 | 1.41 | 2019 | 1.47 | 2018 | 1.51 | 2017 | 1.55 | 2016 | 1.59 | 2015 | 1.6 | 2014 | 1.61 | 2013 | 1.61 | 2012 | 1.63 | 2011 | 1.63 | 2010 | 1.65 | 2009 | 1.69 | 2008 | 1.7 | 2007 | 1.67 | 2006 | 1.63 | 2005 | 1.58 | 2004 | 1.56 | 2003 | 1.55 | 2002 | 1.52 | 2001 | 1.54 | 2000 | 1.51 | 1999 | 1.55 | 1998 | 1.56 | 1997 | 1.57 | 1996 | 1.63 | 1995 | 1.67 | 1994 | 1.69 | 1993 | 1.69 | 1992 | 1.71 | 1991 | 1.72 | 1990 | 1.83 | 1989 | 1.77 | 1988 | 1.68 | 1987 | 1.68 | 1986 | 1.675 | 1985 | 1.67 | 1984 | 1.65 | 1983 | 1.68 | 1982 | 1.69 | 1981 | 1.7 | 1980 | 1.74 | 1979 | 1.754 | 1978 | 1.768 | 1977 | 1.782 | 1976 | 1.796 | 1975 | 1.824 | 1974 | 1.837 | 1973 | 1.89 | 1972 | 1.98 | 1971 | 2.141 | 1970 | 2.258 | 1969 | 2.334 | 1968 | 2.386 | 1967 | 2.528 | 1966 | 2.749 | 1965 | 3.115 | 1964 | 3.456 | 1963 | 3.607 | 1962 | 3.681 | 1961 | 3.753 | 1960 | 3.811 |
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