Year | Value | 2021 | 73.551 | 2020 | 75.981 | 2019 | 75.68 | 2018 | 75.937 | 2017 | 75.703 | 2016 | 74.851 | 2015 | 74.224 | 2014 | 73.197 | 2013 | 73.176 | 2012 | 73.346 | 2011 | 73.612 | 2010 | 73.587 | 2009 | 73.013 | 2008 | 72.271 | 2007 | 71.641 | 2006 | 71.011 | 2005 | 70.425 | 2004 | 69.832 | 2003 | 68.94 | 2002 | 68.831 | 2001 | 68.687 | 2000 | 68.757 | 1999 | 68.637 | 1998 | 68.789 | 1997 | 68.732 | 1996 | 68.842 | 1995 | 68.402 | 1994 | 68.306 | 1993 | 68.076 | 1992 | 67.785 | 1991 | 67.504 | 1990 | 67.279 | 1989 | 67.034 | 1988 | 66.776 | 1987 | 66.516 | 1986 | 66.298 | 1985 | 66.058 | 1984 | 65.872 | 1983 | 65.591 | 1982 | 65.455 | 1981 | 65.215 | 1980 | 65.014 | 1979 | 64.864 | 1978 | 64.578 | 1977 | 64.344 | 1976 | 64.101 | 1975 | 63.867 | 1974 | 63.619 | 1973 | 63.537 | 1972 | 63.329 | 1971 | 63.121 | 1970 | 63.205 | 1969 | 62.991 | 1968 | 62.828 | 1967 | 62.652 | 1966 | 62.425 | 1965 | 62.203 | 1964 | 62.02 | 1963 | 61.473 | 1962 | 60.806 | 1961 | 60.076 | 1960 | 59.352 |
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