Year | Value | 2021 | 84.671 | 2020 | 83.96 | 2019 | 84.38 | 2018 | 83.99 | 2017 | 84.02 | 2016 | 84.03 | 2015 | 83.89 | 2014 | 83.91 | 2013 | 83.85 | 2012 | 83.82 | 2011 | 83.68 | 2010 | 83.54 | 2009 | 83.33 | 2008 | 83.05 | 2007 | 82.91 | 2006 | 82.91 | 2005 | 82.52 | 2004 | 82.42 | 2003 | 82.23 | 2002 | 82.02 | 2001 | 82 | 2000 | 81.82 | 1999 | 81.61 | 1998 | 81.41 | 1997 | 81.25 | 1996 | 81.15 | 1995 | 81.03 | 1994 | 80.95 | 1993 | 80.86 | 1992 | 81.07 | 1991 | 80.81 | 1990 | 80.73 | 1989 | 80.49 | 1988 | 80.27 | 1987 | 80.19 | 1986 | 79.87 | 1985 | 79.8 | 1984 | 79.82 | 1983 | 79.61 | 1982 | 79.29 | 1981 | 79.16 | 1980 | 78.79 | 1979 | 78.59 | 1978 | 78.32 | 1977 | 77.97 | 1976 | 77.59 | 1975 | 77.23 | 1974 | 76.91 | 1973 | 76.83 | 1972 | 76.55 | 1971 | 76.63 | 1970 | 76.25 | 1969 | 76.01 | 1968 | 75.78 | 1967 | 75.66 | 1966 | 75.39 | 1965 | 75.14 | 1964 | 75.08 | 1963 | 74.5 | 1962 | 74.43 | 1961 | 74.45 | 1960 | 74.15 |
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