Year | Value | 2021 | 73.719 | 2020 | 73.698 | 2019 | 73.669 | 2018 | 73.614 | 2017 | 73.58 | 2016 | 73.561 | 2015 | 73.528 | 2014 | 73.489 | 2013 | 73.485 | 2012 | 73.454 | 2011 | 73.424 | 2010 | 73.381 | 2009 | 73.056 | 2008 | 73.272 | 2007 | 73.209 | 2006 | 73.13 | 2005 | 73.063 | 2004 | 73.113 | 2003 | 73.021 | 2002 | 72.936 | 2001 | 72.795 | 2000 | 72.76 | 1999 | 72.668 | 1998 | 72.565 | 1997 | 72.437 | 1996 | 72.328 | 1995 | 72.204 | 1994 | 72.066 | 1993 | 71.932 | 1992 | 71.782 | 1991 | 71.621 | 1990 | 71.365 | 1989 | 71.257 | 1988 | 71.155 | 1987 | 71.021 | 1986 | 70.919 | 1985 | 70.814 | 1984 | 70.725 | 1983 | 70.644 | 1982 | 70.292 | 1981 | 70.409 | 1980 | 70.269 | 1979 | 70.126 | 1978 | 69.959 | 1977 | 69.733 | 1976 | 69.532 | 1975 | 69.24 | 1974 | 69.003 | 1973 | 68.588 | 1972 | 68.286 | 1971 | 67.833 | 1970 | 67.236 | 1969 | 66.578 | 1968 | 65.898 | 1967 | 65.237 | 1966 | 64.565 | 1965 | 63.853 | 1964 | 63.169 | 1963 | 62.544 | 1962 | 61.991 | 1961 | 61.362 | 1960 | 60.957 |
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