Year | Value | 2021 | 0.73091021507751 | 2020 | 0.73091021507751 | 2019 | 0.72649383915559 | 2018 | 0.72870202711655 | 2017 | 0.72870202711655 | 2016 | 0.71986927527271 | 2015 | 0.70662014750696 | 2014 | 0.69557920770216 | 2013 | 0.66245638828777 | 2012 | 0.66245638828777 | 2011 | 0.66245638828777 | 2010 | 0.66245638828777 | 2009 | 0.66245638828777 | 2008 | 0.65141544848297 | 2007 | 0.58075343373228 | 2006 | 0.56971249392748 | 2005 | 0.52996511063022 | 2004 | 0.50788323102062 | 2003 | 0.49684229121583 | 2002 | 0.48580135141103 | 2001 | 0.46371947180144 | 2000 | 0.45267853199664 | 1999 | 0.44826215607473 | 1998 | 0.43942940423089 | 1997 | 0.43501302830897 | 1996 | 0.43059665238705 | 1995 | 0.42838846442609 | 1994 | 0.42618027646513 | 1993 | 0.42618027646513 | 1992 | 0.42397208850417 | 1991 | 0.42397208850417 | 1990 | 0.42397208850417 | 1989 | 0.41955571258225 | 1988 | 0.41513933666034 | 1987 | 0.41072296073842 | 1986 | 0.40851477277746 | 1985 | 0.40409839685554 | 1984 | 0.39747383297266 | 1983 | 0.3952656450117 | 1982 | 0.38643289316787 | 1981 | 0.37980832928499 | 1980 | 0.36876738948019 | 1979 | 0.36435101355827 | 1978 | 0.35331007375348 | 1977 | 0.31797906637813 | 1976 | 0.30472993861238 | 1975 | 0.29148081084662 | 1974 | 0.27823168308086 | 1973 | 0.26498255531511 | 1972 | 0.25173342754935 | 1971 | 0.2384842997836 | 1970 | 0.22523517201784 | 1969 | 0.20094510444729 | 1968 | 0.18769597668154 | 1967 | 0.18769597668154 | 1966 | 0.17665503687674 | 1965 | 0.16561409707194 | 1964 | 0.16561409707194 | 1963 | 0.16561409707194 | 1962 | 0.16561409707194 | 1961 | 0.16561409707194 |
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