Year | Value | 2022 | 0.27537998490111 | 2021 | 0.075905341183699 | 2020 | 0.36941572328584 | 2019 | 0.28663400178024 | 2018 | 0.35349758887287 | 2017 | 0.38047011490751 | 2016 | 0.4519936561619 | 2015 | 0.4469773021401 | 2014 | 0.45520199131643 | 2013 | 0.43802451424175 | 2012 | 0.41762162131947 | 2011 | 0.27353460521758 | 2010 | 0.46360962993339 | 2009 | 0.51223710764997 | 2008 | 0.60279496165374 | 2007 | 0.58424158906448 | 2006 | 0.53871019210583 | 2005 | 0.50203014718431 | 2004 | 0.51221299528177 | 2003 | 0.49634355764638 | 2002 | 0.50096062915614 | 2001 | 0.47874358359404 | 2000 | 0.50042197994982 | 1999 | 0.4783062800513 | 1998 | 0.49096059118317 | 1997 | 0.5239254706447 | 1996 | 0.55080121725514 | 1995 | 0.53590048388553 | 1994 | 0.57319297214826 | 1993 | 0.64490054905141 | 1992 | 0.69839831990333 | 1991 | 0.73928131359425 | 1990 | 0.64093976289905 | 1989 | 0.62004133587197 | 1988 | 0.57699729624051 | 1987 | 0.55695013336336 | 1986 | 0.54098548943398 | 1985 | 0.51648761248002 | 1984 | 0.51801419318861 | 1983 | 0.5583938969375 | 1982 | 0.61137069907031 | 1981 | 0.67060075785793 | 1980 | 0.67945892314263 | 1979 | 0.71221620480743 | 1978 | 0.68474221287647 | 1977 | 0.68386541588703 | 1976 | 0.70219069620703 | 1975 | 0.78937710941744 | 1974 | 0.83725437441255 | 1973 | 0.87333891753643 | 1972 | 0.93676960352607 | 1971 | 1.1144414867722 | 1970 | 0.90791161027272 | 1969 | 0.92770812828931 | 1968 | 0.94299229967818 | 1967 | 0.98251987565909 | 1966 | 1.0358893829017 | 1965 | 1.1077075990569 | 1964 | 1.1490498798019 | 1963 | 1.1746469556634 | 1962 | 1.2152532036473 | 1961 | 1.2048890077664 |
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