Year | Value | 2021 | 75.436 | 2020 | 78.43 | 2019 | 77.508 | 2018 | 77.611 | 2017 | 77.625 | 2016 | 77.571 | 2015 | 77.483 | 2014 | 77.366 | 2013 | 77.24 | 2012 | 77.111 | 2011 | 76.983 | 2010 | 76.858 | 2009 | 76.738 | 2008 | 76.623 | 2007 | 76.498 | 2006 | 76.362 | 2005 | 76.194 | 2004 | 76.007 | 2003 | 75.785 | 2002 | 75.54 | 2001 | 75.285 | 2000 | 75.025 | 1999 | 74.769 | 1998 | 74.527 | 1997 | 74.298 | 1996 | 74.088 | 1995 | 73.896 | 1994 | 73.728 | 1993 | 73.579 | 1992 | 73.441 | 1991 | 73.305 | 1990 | 73.162 | 1989 | 73.002 | 1988 | 72.82 | 1987 | 72.613 | 1986 | 72.381 | 1985 | 72.123 | 1984 | 71.841 | 1983 | 71.539 | 1982 | 71.223 | 1981 | 70.901 | 1980 | 70.582 | 1979 | 70.279 | 1978 | 69.999 | 1977 | 69.746 | 1976 | 69.523 | 1975 | 69.335 | 1974 | 69.193 | 1973 | 69.096 | 1972 | 68.933 | 1971 | 68.969 | 1970 | 68.904 | 1969 | 68.815 | 1968 | 68.698 | 1967 | 68.558 | 1966 | 68.427 | 1965 | 68.294 | 1964 | 68.179 | 1963 | 68.084 | 1962 | 67.994 | 1961 | 67.895 | 1960 | 67.772 |
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