Year | Value | 2021 | 71.3 | 2020 | 73.5 | 2019 | 74.3 | 2018 | 73.9 | 2017 | 73.8 | 2016 | 73.8 | 2015 | 73.1 | 2014 | 73.3 | 2013 | 72.9 | 2012 | 72.5 | 2011 | 72.3 | 2010 | 71.6 | 2009 | 71.3 | 2008 | 70.9 | 2007 | 70.5 | 2006 | 70.4 | 2005 | 70.1 | 2004 | 70.3 | 2003 | 69.8 | 2002 | 69.8 | 2001 | 69.5 | 2000 | 69.1 | 1999 | 69 | 1998 | 68.6 | 1997 | 68.9 | 1996 | 68.8 | 1995 | 68.4 | 1994 | 68.3 | 1993 | 68.4 | 1992 | 67.6 | 1991 | 66.8 | 1990 | 66.64 | 1989 | 66.88 | 1988 | 67.12 | 1987 | 67.24 | 1986 | 67.47 | 1985 | 66.92 | 1984 | 66.79 | 1983 | 66.64 | 1982 | 66.85 | 1981 | 66.8 | 1980 | 66.75 | 1979 | 67.114 | 1978 | 66.904 | 1977 | 66.748 | 1976 | 67.011 | 1975 | 66.847 | 1974 | 66.825 | 1973 | 66.797 | 1972 | 66.927 | 1971 | 66.625 | 1970 | 66.656 | 1969 | 66.691 | 1968 | 67.567 | 1967 | 68.229 | 1966 | 67.715 | 1965 | 67.806 | 1964 | 68.675 | 1963 | 68.19 | 1962 | 68.002 | 1961 | 68.54 | 1960 | 68.121 |
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