Year | Value | 2021 | 84.5 | 2020 | 84.5 | 2019 | 84.6 | 2018 | 84.6 | 2017 | 84.6 | 2016 | 84.4 | 2015 | 84.1 | 2014 | 84.3 | 2013 | 84 | 2012 | 83 | 2011 | 83 | 2010 | 83.6 | 2009 | 82.7 | 2008 | 82.3 | 2007 | 82.2 | 2006 | 82 | 2005 | 81.4 | 2004 | 81.2 | 2003 | 80.8 | 2002 | 81.3 | 2001 | 81.2 | 2000 | 80.5 | 1999 | 79.6 | 1998 | 80.2 | 1997 | 80.3 | 1996 | 79.8 | 1995 | 79.8 | 1994 | 78.354 | 1993 | 79.357 | 1992 | 77.435 | 1991 | 77.667 | 1990 | 78.38 | 1989 | 77.483 | 1988 | 76.702 | 1987 | 76.575 | 1986 | 75.672 | 1985 | 75.891 | 1984 | 74.623 | 1983 | 73.847 | 1982 | 72.182 | 1981 | 74.206 | 1980 | 74.475 | 1979 | 74.025 | 1978 | 73.637 | 1977 | 73.512 | 1976 | 72.967 | 1975 | 73.143 | 1974 | 73.02 | 1973 | 72.581 | 1972 | 73.165 | 1971 | 71.384 | 1970 | 71.688 | 1969 | 71.131 | 1968 | 71.805 | 1967 | 70.531 | 1966 | 70.146 | 1965 | 70.457 | 1964 | 70.413 | 1963 | 69.491 | 1962 | 70.3 | 1961 | 68.597 | 1960 | 69.903 |
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