Year | Value | 2021 | 85.9 | 2020 | 85.1 | 2019 | 85.8 | 2018 | 85.7 | 2017 | 85.6 | 2016 | 85.6 | 2015 | 85.1 | 2014 | 85.4 | 2013 | 85 | 2012 | 84.9 | 2011 | 85 | 2010 | 84.5 | 2009 | 84.4 | 2008 | 84.4 | 2007 | 84.2 | 2006 | 84 | 2005 | 83.9 | 2004 | 83.7 | 2003 | 83.2 | 2002 | 83.1 | 2001 | 83.1 | 2000 | 82.6 | 1999 | 82.5 | 1998 | 82.5 | 1997 | 82.04 | 1996 | 82 | 1995 | 81.69 | 1994 | 81.71 | 1993 | 81.43 | 1992 | 81.33 | 1991 | 81.1 | 1990 | 80.71 | 1989 | 80.94 | 1988 | 80.73 | 1987 | 80.66 | 1986 | 80.3 | 1985 | 80.15 | 1984 | 80.03 | 1983 | 79.55 | 1982 | 79.44 | 1981 | 79.13 | 1980 | 78.85 | 1979 | 78.78 | 1978 | 78.66 | 1977 | 78.68 | 1976 | 78.13 | 1975 | 78 | 1974 | 77.56 | 1973 | 77.05 | 1972 | 76.82 | 1971 | 76.25 | 1970 | 76.16 | 1969 | 75.65 | 1968 | 75.52 | 1967 | 75.72 | 1966 | 75.25 | 1965 | 75.07 | 1964 | 75.11 | 1963 | 74.23 | 1962 | 74.09 | 1961 | 74.59 | 1960 | 74.11 |
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