Year | Value | 2021 | 87.948 | 2020 | 87.771 | 2019 | 87.573 | 2018 | 87.439 | 2017 | 87.094 | 2016 | 87.018 | 2015 | 86.784 | 2014 | 86.773 | 2013 | 86.831 | 2012 | 86.341 | 2011 | 86.292 | 2010 | 86.164 | 2009 | 86.098 | 2008 | 85.83 | 2007 | 85.496 | 2006 | 85.163 | 2005 | 84.739 | 2004 | 84.498 | 2003 | 84.299 | 2002 | 84.138 | 2001 | 83.955 | 2000 | 83.49 | 1999 | 83.571 | 1998 | 83.177 | 1997 | 82.769 | 1996 | 82.642 | 1995 | 81.799 | 1994 | 81.361 | 1993 | 80.93 | 1992 | 80.51 | 1991 | 80.052 | 1990 | 79.468 | 1989 | 79.1 | 1988 | 78.643 | 1987 | 78.39 | 1986 | 77.942 | 1985 | 77.561 | 1984 | 77.15 | 1983 | 76.767 | 1982 | 76.371 | 1981 | 75.915 | 1980 | 75.471 | 1979 | 75.08 | 1978 | 74.686 | 1977 | 74.256 | 1976 | 73.786 | 1975 | 73.326 | 1974 | 72.881 | 1973 | 72.407 | 1972 | 71.859 | 1971 | 71.294 | 1970 | 70.903 | 1969 | 70.52 | 1968 | 70.108 | 1967 | 69.625 | 1966 | 69.226 | 1965 | 68.816 | 1964 | 68.412 | 1963 | 67.997 | 1962 | 67.539 | 1961 | 67.054 | 1960 | 66.46 |
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