Year | Value | 2021 | 83.082 | 2020 | 84.596 | 2019 | 84.212 | 2018 | 83.821 | 2017 | 80.1 | 2016 | 79.8 | 2015 | 80.2 | 2014 | 79.9 | 2013 | 80.2 | 2012 | 80.1 | 2011 | 79.5 | 2010 | 80.2 | 2009 | 79.9 | 2008 | 79.6 | 2007 | 79.5 | 2006 | 79.2 | 2005 | 79 | 2004 | 78.8 | 2003 | 78.6 | 2002 | 79.2 | 2001 | 77.7 | 2000 | 78.8 | 1999 | 77 | 1998 | 77.5 | 1997 | 74.3 | 1996 | 74.2 | 1995 | 75.8 | 1994 | 73.9 | 1993 | 75.6 | 1992 | 75.2 | 1991 | 74.2 | 1990 | 73.2 | 1989 | 71.8 | 1988 | 73.5 | 1987 | 72.5 | 1986 | 72.7 | 1985 | 72.3 | 1984 | 71.7 | 1983 | 71.2 | 1982 | 70.3 | 1981 | 70.8 | 1980 | 70.475 | 1979 | 70.15 | 1978 | 69.825 | 1977 | 69.5 | 1976 | 69 | 1975 | 68.5 | 1974 | 68 | 1973 | 67.5 | 1972 | 67 | 1971 | 66.5 | 1970 | 66 | 1969 | 65.5 | 1968 | 65 | 1967 | 64.5 | 1966 | 64 | 1965 | 63.5 | 1964 | 63 | 1963 | 62.5 | 1962 | 62 | 1961 | 61.6 | 1960 | 61.2 |
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