Year | Value | 2021 | 85 | 2020 | 84.2 | 2019 | 84.8 | 2018 | 84.3 | 2017 | 84.1 | 2016 | 84.1 | 2015 | 84.1 | 2014 | 84.2 | 2013 | 83.8 | 2012 | 83.6 | 2011 | 83.8 | 2010 | 83.5 | 2009 | 83.4 | 2008 | 83.2 | 2007 | 83 | 2006 | 82.9 | 2005 | 82.8 | 2004 | 82.7 | 2003 | 82.4 | 2002 | 82.1 | 2001 | 82.1 | 2000 | 82 | 1999 | 81.9 | 1998 | 81.9 | 1997 | 81.82 | 1996 | 81.52 | 1995 | 81.45 | 1994 | 81.37 | 1993 | 80.77 | 1992 | 80.78 | 1991 | 80.53 | 1990 | 80.4 | 1989 | 80.8 | 1988 | 79.95 | 1987 | 80.15 | 1986 | 80.03 | 1985 | 79.7 | 1984 | 79.93 | 1983 | 79.63 | 1982 | 79.38 | 1981 | 79.13 | 1980 | 78.85 | 1979 | 78.71 | 1978 | 78.66 | 1977 | 78.54 | 1976 | 77.94 | 1975 | 77.94 | 1974 | 77.9 | 1973 | 77.71 | 1972 | 77.53 | 1971 | 77.4 | 1970 | 77.2 | 1969 | 76.61 | 1968 | 76.37 | 1967 | 76.54 | 1966 | 76.45 | 1965 | 76.1 | 1964 | 75.91 | 1963 | 75.64 | 1962 | 75.43 | 1961 | 75.39 | 1960 | 74.87 |
|