Year | Value | 2022 | 0.6362931600644 | 2021 | 0.75913111163443 | 2020 | 0.83428120753142 | 2019 | 0.76078182691898 | 2018 | 0.58950150222362 | 2017 | 0.53010046361935 | 2016 | 0.45204729947569 | 2015 | 0.45082567829522 | 2014 | 0.58077192022376 | 2013 | 0.80979001716308 | 2012 | 0.76563068941787 | 2011 | 0.65972850364716 | 2010 | 0.71820102362605 | 2009 | 0.94970458783891 | 2008 | 0.83563699391352 | 2007 | 0.7579519678464 | 2006 | 0.77765149795332 | 2005 | 1.0452616055783 | 2004 | 0.63186805929777 | 2003 | 0.40879245995068 | 2002 | 0.42382286451844 | 2001 | 0.73882204846402 | 2000 | 0.67263882868564 | 1999 | 0.81101447054165 | 1998 | 0.81363984202995 | 1997 | 0.99155607515047 | 1996 | 0.88346812069005 | 1995 | 0.79055917371701 | 1994 | 1.4218800679221 | 1993 | 1.262975392746 | 1992 | 1.4024860429968 | 1991 | 1.0757301042543 | 1990 | 1.30860569242 | 1989 | 1.497070870642 | 1988 | 1.5113081131689 | 1987 | 1.8288064269319 | 1986 | 2.095467783036 | 1985 | 1.7511183094247 | 1984 | 1.5595349654445 | 1983 | 1.816410327789 | 1982 | 2.2869649024175 | 1981 | 3.1111813013266 | 1980 | 4.2931051636653 | 1979 | 4.0659340659341 | 1978 | 2.6945172973648 | 1977 | 1.6899038461539 | 1976 | 1.3733660130719 | 1975 | 1.5268076269587 | 1974 | 0.96695557963164 | 1973 | 1.0604395604396 | 1972 | 0.60219994430521 | 1971 | 0.58151687070767 | 1970 | 0.6411456383377 | 1969 | 0.66796235679214 | 1968 | 0.69543034605146 | 1967 | 0.7169373549884 | 1966 | 0.64579256360078 | 1965 | 0.70199778024417 |
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