Year | Value | 2021 | 83.8 | 2020 | 83.6 | 2019 | 84.2 | 2018 | 84.1 | 2017 | 84 | 2016 | 84.1 | 2015 | 83.7 | 2014 | 84 | 2013 | 83.8 | 2012 | 83.6 | 2011 | 83.8 | 2010 | 83.5 | 2009 | 83.2 | 2008 | 83.3 | 2007 | 83.1 | 2006 | 82.8 | 2005 | 82.2 | 2004 | 82.1 | 2003 | 81.5 | 2002 | 81.7 | 2001 | 81.7 | 2000 | 81.2 | 1999 | 81 | 1998 | 81 | 1997 | 80.7 | 1996 | 80.2 | 1995 | 80.1 | 1994 | 79.8 | 1993 | 79.5 | 1992 | 79.3 | 1991 | 79.1 | 1990 | 79 | 1989 | 78.8 | 1988 | 78.7 | 1987 | 78.2 | 1986 | 77.8 | 1985 | 77.4 | 1984 | 77.3 | 1983 | 76.7 | 1982 | 76.7 | 1981 | 76.5 | 1980 | 76.1 | 1979 | 76 | 1978 | 75.7 | 1977 | 75.5 | 1976 | 75.1 | 1975 | 74.7 | 1974 | 74.7 | 1973 | 74.6 | 1972 | 74.1 | 1971 | 73.7 | 1970 | 73.5 | 1969 | 73.27 | 1968 | 73.52 | 1967 | 73.37 | 1966 | 73.37 | 1965 | 72.99 | 1964 | 73.2 | 1963 | 72.65 | 1962 | 72.48 | 1961 | 72.84 | 1960 | 71.92 |
|