Year | Value | 2021 | 84.522 | 2020 | 82.588 | 2019 | 83.456 | 2018 | 84.236 | 2017 | 83.145 | 2016 | 84.464 | 2015 | 83.762 | 2014 | 82.882 | 2013 | 82.7 | 2012 | 82.428 | 2011 | 82.323 | 2010 | 82.06 | 2009 | 81.951 | 2008 | 81.927 | 2007 | 81.737 | 2006 | 81.475 | 2005 | 81.354 | 2004 | 81.236 | 2003 | 80.934 | 2002 | 80.807 | 2001 | 80.568 | 2000 | 80.126 | 1999 | 79.761 | 1998 | 79.475 | 1997 | 79.308 | 1996 | 79.107 | 1995 | 78.991 | 1994 | 78.869 | 1993 | 78.893 | 1992 | 78.277 | 1991 | 78.266 | 1990 | 78.244 | 1989 | 78.218 | 1988 | 78.209 | 1987 | 78.182 | 1986 | 77.858 | 1985 | 77.19 | 1984 | 77.556 | 1983 | 77.513 | 1982 | 77.548 | 1981 | 77.441 | 1980 | 77.38 | 1979 | 77.158 | 1978 | 76.907 | 1977 | 76.544 | 1976 | 76.247 | 1975 | 75.927 | 1974 | 75.833 | 1973 | 75.803 | 1972 | 75.321 | 1971 | 74.883 | 1970 | 74.556 | 1969 | 74.348 | 1968 | 73.855 | 1967 | 73.845 | 1966 | 73.618 | 1965 | 73.329 | 1964 | 72.919 | 1963 | 72.586 | 1962 | 72.26 | 1961 | 72.131 | 1960 | 71.599 |
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