Year | Value | 2021 | 73.547 | 2020 | 74.852 | 2019 | 75.617 | 2018 | 75.232 | 2017 | 75.059 | 2016 | 74.51 | 2015 | 73.838 | 2014 | 73.524 | 2013 | 73.586 | 2012 | 73.625 | 2011 | 73.679 | 2010 | 73.778 | 2009 | 73.876 | 2008 | 73.477 | 2007 | 72.996 | 2006 | 72.564 | 2005 | 72.045 | 2004 | 71.621 | 2003 | 70.997 | 2002 | 70.505 | 2001 | 70.466 | 2000 | 70.035 | 1999 | 69.044 | 1998 | 68.895 | 1997 | 68.639 | 1996 | 67.842 | 1995 | 68.961 | 1994 | 68.705 | 1993 | 70.306 | 1992 | 71.239 | 1991 | 70.302 | 1990 | 71.564 | 1989 | 72.121 | 1988 | 71.5 | 1987 | 71.331 | 1986 | 70.987 | 1985 | 69.122 | 1984 | 69.178 | 1983 | 69.317 | 1982 | 69.588 | 1981 | 69.093 | 1980 | 68.681 | 1979 | 68.296 | 1978 | 68 | 1977 | 67.958 | 1976 | 67.929 | 1975 | 67.897 | 1974 | 67.647 | 1973 | 67.603 | 1972 | 67.546 | 1971 | 67.292 | 1970 | 67.354 | 1969 | 67.351 | 1968 | 67.304 | 1967 | 67.08 | 1966 | 66.96 | 1965 | 66.674 | 1964 | 66.455 | 1963 | 66.057 | 1962 | 65.749 | 1961 | 65.325 | 1960 | 64.917 |
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