Year | Value | 2021 | 85.9 | 2020 | 85.9 | 2019 | 85.9 | 2018 | 85.5 | 2017 | 85.4 | 2016 | 85.1 | 2015 | 85.1 | 2014 | 84.8 | 2013 | 84.5 | 2012 | 84.3 | 2011 | 84.1 | 2010 | 84 | 2009 | 83.7 | 2008 | 83.3 | 2007 | 82.9 | 2006 | 82.6 | 2005 | 82.5 | 2004 | 82 | 2003 | 81.6 | 2002 | 80.6 | 2001 | 80.3 | 2000 | 80 | 1999 | 79.6 | 1998 | 79.4 | 1997 | 79.1 | 1996 | 78.9 | 1995 | 78.6 | 1994 | 78.4 | 1993 | 78.3 | 1992 | 78.2 | 1991 | 77.9 | 1990 | 77.6 | 1989 | 77.2 | 1988 | 76.9 | 1987 | 76.7 | 1986 | 76.5 | 1985 | 76.4 | 1984 | 75.8 | 1983 | 75.7 | 1982 | 75.3 | 1981 | 75.2 | 1980 | 74.7 | 1979 | 74.549 | 1978 | 74.56 | 1977 | 74.495 | 1976 | 74.438 | 1975 | 73.999 | 1974 | 73.442 | 1973 | 72.919 | 1972 | 72.632 | 1971 | 72.492 | 1970 | 72.079 | 1969 | 71.888 | 1968 | 71.427 | 1967 | 71.277 | 1966 | 70.842 | 1965 | 70.662 | 1964 | 70.145 | 1963 | 69.73 | 1962 | 69.005 | 1961 | 68.145 | 1960 | 67.333 |
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