Year | Value | 2022 | 0.35007061763268 | 2021 | 0.38487926103879 | 2020 | 0.35094899487423 | 2019 | 0.34381843475139 | 2018 | 0.32587665715017 | 2017 | 0.31270123821338 | 2016 | 0.29141191739338 | 2015 | 0.39291435545917 | 2014 | 0.48498903481132 | 2013 | 0.40029322450554 | 2012 | 0.59320855248337 | 2011 | 0.43515452267479 | 2010 | 0.28268765523693 | 2009 | 0.33675787091299 | 2008 | 0.29403350042792 | 2007 | 0.37033291457286 | 2006 | 0.26221353281197 | 2005 | 0.26096707634341 | 2004 | 0.27757091227686 | 2003 | 0.30375830974791 | 2002 | 0.26030561478323 | 2001 | 0.2644528129636 | 2000 | 0.4436304 | 1999 | 0.33367109985223 | 1998 | 0.33470766129032 | 1997 | 0.28793817619784 | 1996 | 0.28690363349131 | 1995 | 0.33574771689498 | 1994 | 0.42658669592913 | 1993 | 0.42195163988991 | 1992 | 0.37734721969711 | 1991 | 0.36897504498886 | 1990 | 0.276510427355 | 1989 | 0.43084652239259 | 1988 | 0.43788051750381 | 1987 | 0.8926273458445 | 1986 | 0.90051684386935 | 1985 | 1.0004430866817 | 1984 | 0.59321188197856 | 1983 | 0.34117953900825 | 1981 | 0.74111353169898 | 1980 | 0.77357477889529 | 1979 | 0.64630430160867 | 1978 | 0.8512818069189 | 1977 | 1.2532473349458 | 1976 | 1.5668096843396 | 1975 | 1.7149346961953 | 1974 | 1.5815450643777 | 1973 | 1.3649343232439 | 1972 | 1.4298401420959 | 1971 | 1.7013194722111 | 1970 | 2.1181938911023 | 1969 | 2.5012506253127 | 1968 | 2.6558823529412 | 1966 | 2.2266139657444 | 1965 | 1.7326057298772 | 1964 | 1.9219886822959 | 1963 | 2.016348773842 | 1962 | 2.0010030090271 | 1961 | 2.1030042918455 | 1960 | 1.7066590126292 |
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