Year | Value | 2021 | 84.7 | 2020 | 84.8 | 2019 | 84.8 | 2018 | 84.5 | 2017 | 84.5 | 2016 | 84.4 | 2015 | 84.4 | 2014 | 84.1 | 2013 | 84.1 | 2012 | 83.7 | 2011 | 83.8 | 2010 | 83.2 | 2009 | 83.1 | 2008 | 83 | 2007 | 82.9 | 2006 | 82.8 | 2005 | 82.3 | 2004 | 82.3 | 2003 | 81.8 | 2002 | 81.5 | 2001 | 81.5 | 2000 | 81 | 1999 | 81.02 | 1998 | 80.84 | 1997 | 80.51 | 1996 | 80.54 | 1995 | 80.21 | 1994 | 80.15 | 1993 | 79.48 | 1992 | 79.43 | 1991 | 79.32 | 1990 | 78.88 | 1989 | 78.9 | 1988 | 78.69 | 1987 | 78.71 | 1986 | 78.76 | 1985 | 78.51 | 1984 | 78.76 | 1983 | 78.36 | 1982 | 78.58 | 1981 | 78.09 | 1980 | 77.85 | 1979 | 77.55 | 1978 | 77.43 | 1977 | 76.96 | 1976 | 76.31 | 1975 | 76.14 | 1974 | 75.55 | 1973 | 75.69 | 1972 | 75.02 | 1971 | 74.32 | 1970 | 74.4 | 1969 | 73.56 | 1968 | 73.55 | 1967 | 73.59 | 1966 | 73.17 | 1965 | 72.85 | 1964 | 72.96 | 1963 | 72.68 | 1962 | 72.24 | 1961 | 72.24 | 1960 | 72.4 |
|