Year | Value | 2021 | 0.85572649111689 | 2020 | 0.86065749274291 | 2019 | 0.85329470132759 | 2018 | 0.85239732734844 | 2017 | 0.84938539946627 | 2016 | 0.84979637893694 | 2015 | 0.8528530387501 | 2014 | 0.84295876559155 | 2013 | 0.82631400049019 | 2012 | 0.84707121631043 | 2011 | 0.82953821473052 | 2010 | 0.79370450001125 | 2009 | 0.78079192493821 | 2008 | 0.76855655384588 | 2007 | 0.75443394005084 | 2006 | 0.75462656148234 | 2005 | 0.75486793432701 | 2004 | 0.75583294453784 | 2003 | 0.75860974885001 | 2002 | 0.76190403911297 | 2001 | 0.76028857754939 | 2000 | 0.75867300471142 | 1999 | 0.76901267087444 | 1998 | 0.86982441596386 | 1997 | 0.79292314887642 | 1996 | 0.85366868758415 | 1995 | 0.85366868758415 | 1994 | 0.85366868758415 | 1993 | 0.87370179077499 | 1992 | 0.88016408212688 | 1991 | 0.88404145693801 | 1990 | 0.88533391520839 | 1989 | 0.88791883174914 | 1988 | 0.88210276953244 | 1987 | 0.8620696663416 | 1986 | 0.84397525055632 | 1985 | 0.87434801991018 | 1984 | 0.8620696663416 | 1983 | 0.84785262536745 | 1982 | 0.80843264812094 | 1981 | 0.78322971184859 | 1980 | 0.76384283779293 | 1979 | 0.74962579681878 | 1978 | 0.74574842200765 | 1977 | 0.71085204870746 | 1976 | 0.61391767842917 | 1975 | 0.53443149480097 | 1974 | 0.51762953728607 | 1973 | 0.50987478766381 | 1972 | 0.50147380890636 | 1971 | 0.50082757977117 | 1970 | 0.48079447658032 | 1969 | 0.4820869348507 | 1968 | 0.50212003804155 | 1967 | 0.52926166171947 | 1966 | 0.57191278464191 | 1965 | 0.56028066020852 | 1964 | 0.54929476491031 | 1963 | 0.47110103955249 | 1962 | 0.46786989387655 | 1961 | 0.40324698035769 |
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