Year | Value | 2021 | 0.26691437802908 | 2020 | 0.24122778675283 | 2019 | 0.25150242326333 | 2018 | 0.24768982229402 | 2017 | 0.22390953150242 | 2016 | 0.18129240710824 | 2015 | 0.16852988691438 | 2014 | 0.12116316639742 | 2013 | 0.12180936995154 | 2012 | 0.10888529886914 | 2011 | 0.11922455573506 | 2010 | 0.1108239095315 | 2009 | 0.11954765751212 | 2008 | 0.096930533117932 | 2007 | 0.090468497576737 | 2006 | 0.084006462035541 | 2005 | 0.090468497576737 | 2004 | 0.093699515347334 | 2003 | 0.10016155088853 | 2002 | 0.10016155088853 | 2001 | 0.10016155088853 | 2000 | 0.10016155088853 | 1999 | 0.10016155088853 | 1998 | 0.10016155088853 | 1997 | 0.093699515347334 | 1996 | 0.090468497576737 | 1995 | 0.090468497576737 | 1994 | 0.093699515347334 | 1993 | 0.093699515347334 | 1992 | 0.11308562197092 | 1991 | 0.11308562197092 | 1990 | 0.11308562197092 | 1989 | 0.11308562197092 | 1988 | 0.10662358642972 | 1987 | 0.10662358642972 | 1986 | 0.10339256865913 | 1985 | 0.093699515347334 | 1984 | 0.087237479806139 | 1983 | 0.087237479806139 | 1982 | 0.074313408723748 | 1981 | 0.074313408723748 | 1980 | 0.074313408723748 | 1979 | 0.074313408723748 | 1978 | 0.074313408723748 | 1977 | 0.074313408723748 | 1976 | 0.074313408723748 | 1975 | 0.074313408723748 | 1974 | 0.074313408723748 | 1973 | 0.074313408723748 | 1972 | 0.074313408723748 | 1971 | 0.07108239095315 | 1970 | 0.07108239095315 | 1969 | 0.07108239095315 | 1968 | 0.07108239095315 | 1967 | 0.064620355411955 | 1966 | 0.064620355411955 | 1965 | 0.064620355411955 | 1964 | 0.064620355411955 | 1963 | 0.064620355411955 | 1962 | 0.064620355411955 | 1961 | 0.064620355411955 |
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