Year | Value | 2021 | 72.543 | 2020 | 73.918 | 2019 | 73.874 | 2018 | 73.903 | 2017 | 73.912 | 2016 | 73.917 | 2015 | 73.971 | 2014 | 74.21 | 2013 | 74.555 | 2012 | 74.819 | 2011 | 74.997 | 2010 | 74.667 | 2009 | 74.139 | 2008 | 73.604 | 2007 | 73.684 | 2006 | 73.797 | 2005 | 73.735 | 2004 | 73.581 | 2003 | 73.261 | 2002 | 73.168 | 2001 | 72.758 | 2000 | 72.816 | 1999 | 72.807 | 1998 | 72.716 | 1997 | 72.764 | 1996 | 73.025 | 1995 | 72.837 | 1994 | 72.963 | 1993 | 73.041 | 1992 | 73.287 | 1991 | 73.364 | 1990 | 73.359 | 1989 | 73.184 | 1988 | 72.427 | 1987 | 72.141 | 1986 | 71.799 | 1985 | 71.609 | 1984 | 71.45 | 1983 | 71.207 | 1982 | 71.369 | 1981 | 71.04 | 1980 | 70.686 | 1979 | 70.215 | 1978 | 70.081 | 1977 | 69.917 | 1976 | 70.007 | 1975 | 69.837 | 1974 | 69.667 | 1973 | 69.445 | 1972 | 69.011 | 1971 | 68.73 | 1970 | 68.635 | 1969 | 68.213 | 1968 | 68.063 | 1967 | 68.092 | 1966 | 67.909 | 1965 | 67.409 | 1964 | 66.981 | 1963 | 66.809 | 1962 | 65.989 | 1961 | 65.954 | 1960 | 65.673 |
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