Year | Value | 2022 | 0.6067529330629 | 2021 | 0.68205919643926 | 2020 | 0.73779605130135 | 2019 | 0.52342422707509 | 2018 | 0.47749420514203 | 2017 | 0.43651029638344 | 2016 | 0.49506441369679 | 2015 | 0.46667612242258 | 2014 | 0.51382995730754 | 2013 | 0.507919454953 | 2012 | 0.47598728077372 | 2011 | 0.46577780287055 | 2010 | 0.45273449263425 | 2009 | 0.50155627469772 | 2008 | 0.39051322748877 | 2007 | 0.40116391795238 | 2006 | 0.31117193650826 | 2005 | 0.35595893150141 | 2004 | 0.36489872267815 | 2003 | 0.40591654664996 | 2002 | 0.42160600246497 | 2001 | 0.4426570039616 | 2000 | 0.44604782044976 | 1999 | 0.4609887755661 | 1998 | 0.45045048724978 | 1997 | 0.45809585369137 | 1996 | 0.47648477790675 | 1995 | 0.45089153123705 | 1994 | 0.51883032705709 | 1993 | 0.44278549389495 | 1992 | 0.46945465573121 | 1991 | 0.43540230078229 | 1990 | 0.43308103547403 | 1989 | 0.51725582937663 | 1988 | 0.53614537418479 | 1987 | 0.58034188919146 | 1986 | 0.6346224630967 | 1985 | 0.67631313934383 | 1984 | 0.6598190599279 | 1983 | 0.52286631398821 | 1982 | 0.49541941757511 | 1981 | 0.51330101438058 | 1980 | 0.41610738255034 | 1979 | 0.50529747351263 | 1978 | 0.50483443141953 | 1977 | 0.53425620505056 | 1976 | 0.59810357403355 | 1975 | 0.5735842196164 | 1974 | 0.56574413693453 | 1973 | 0.54421768707483 | 1972 | 0.53656808925093 | 1971 | 0.48765558049378 | 1970 | 0.49741165878911 | 1969 | 0.60016004267805 | 1968 | 0.54851076378649 | 1967 | 0.54521710741104 | 1966 | 0.57637906647808 | 1965 | 0.59126984126984 | 1964 | 0.67750677506775 | 1963 | 0.71868583162218 | 1962 | 0.68965517241379 | 1961 | 0.65178032589016 | 1960 | 0.67350865939705 |
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