Year | Value | 2021 | 75.865 | 2020 | 73.644 | 2019 | 74.832 | 2018 | 75.475 | 2017 | 75.425 | 2016 | 76.139 | 2015 | 75.66 | 2014 | 74.985 | 2013 | 74.848 | 2012 | 74.495 | 2011 | 74.315 | 2010 | 73.977 | 2009 | 73.82 | 2008 | 73.769 | 2007 | 73.525 | 2006 | 73.365 | 2005 | 73.14 | 2004 | 73.065 | 2003 | 72.825 | 2002 | 72.663 | 2001 | 72.369 | 2000 | 71.87 | 1999 | 71.379 | 1998 | 71.006 | 1997 | 70.66 | 1996 | 70.238 | 1995 | 69.951 | 1994 | 69.57 | 1993 | 69.471 | 1992 | 69.782 | 1991 | 69.755 | 1990 | 69.741 | 1989 | 69.702 | 1988 | 69.714 | 1987 | 69.718 | 1986 | 69.761 | 1985 | 69.164 | 1984 | 69.675 | 1983 | 69.63 | 1982 | 69.677 | 1981 | 69.475 | 1980 | 69.297 | 1979 | 69.153 | 1978 | 68.966 | 1977 | 68.91 | 1976 | 68.532 | 1975 | 68.195 | 1974 | 67.789 | 1973 | 67.74 | 1972 | 67.629 | 1971 | 67.791 | 1970 | 67.791 | 1969 | 67.879 | 1968 | 67.707 | 1967 | 67.478 | 1966 | 67.15 | 1965 | 66.931 | 1964 | 66.731 | 1963 | 66.617 | 1962 | 66.534 | 1961 | 66.601 | 1960 | 66.447 |
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