Year | Value | 2021 | 75.39 | 2020 | 75.892 | 2019 | 77.284 | 2018 | 76.999 | 2017 | 76.833 | 2016 | 76.308 | 2015 | 76.76 | 2014 | 76.755 | 2013 | 76.491 | 2012 | 76.467 | 2011 | 76.124 | 2010 | 75.721 | 2009 | 75.936 | 2008 | 75.641 | 2007 | 75.006 | 2006 | 75.433 | 2005 | 75.139 | 2004 | 74.855 | 2003 | 74.08 | 2002 | 74.408 | 2001 | 74.186 | 2000 | 73.926 | 1999 | 73.722 | 1998 | 73.474 | 1997 | 73.09 | 1996 | 73.307 | 1995 | 73.133 | 1994 | 73.172 | 1993 | 72.565 | 1992 | 72.43 | 1991 | 72.319 | 1990 | 71.784 | 1989 | 71.425 | 1988 | 71.052 | 1987 | 70.564 | 1986 | 70.119 | 1985 | 69.651 | 1984 | 69.195 | 1983 | 69.267 | 1982 | 68.937 | 1981 | 68.976 | 1980 | 68.564 | 1979 | 68.491 | 1978 | 68.197 | 1977 | 67.861 | 1976 | 67.228 | 1975 | 67.081 | 1974 | 66.563 | 1973 | 66.323 | 1972 | 65.923 | 1971 | 65.541 | 1970 | 65.589 | 1969 | 64.859 | 1968 | 64.89 | 1967 | 64.992 | 1966 | 64.891 | 1965 | 64.593 | 1964 | 64.363 | 1963 | 64.449 | 1962 | 64.244 | 1961 | 64.36 | 1960 | 63.978 |
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