Year | Value | 2022 | 0.35136823385825 | 2021 | 0.34006812236104 | 2020 | 0.19906236997581 | 2019 | 0.061720732933485 | 2018 | 0.15447668047638 | 2017 | 0.2579499469944 | 2016 | 0.31156347129344 | 2015 | 0.34628611764734 | 2014 | 0.38537645571938 | 2013 | 0.39447910708353 | 2012 | 0.38931189351147 | 2011 | 0.38061055059559 | 2010 | 0.37436478717104 | 2009 | 0.37977601402142 | 2008 | 0.39576578853498 | 2007 | 0.16053232278385 | 2006 | 0.056012744073492 | 2005 | 0.035814056190455 | 2004 | 0.14600619513778 | 2003 | 0.25874477931687 | 2002 | 0.38635409748817 | 2001 | 0.4957580845353 | 2000 | 0.58288376756853 | 1999 | 0.65660687078147 | 1998 | 0.72384370885388 | 1997 | 0.78177146889901 | 1996 | 0.84788000038436 | 1995 | 0.9641867674232 | 1994 | 1.0959287189272 | 1993 | 1.408941135869 | 1992 | 1.6550585009538 | 1991 | 1.7342296648792 | 1990 | 1.8115547813532 | 1989 | 1.9229105508738 | 1988 | 2.0169394479735 | 1987 | 1.9210017953784 | 1986 | 1.9097929074409 | 1985 | 1.9575785048784 | 1984 | 1.954031487205 | 1983 | 1.9328916141152 | 1982 | 1.108997551099 | 1981 | 0.88718329930157 | 1980 | 1.6987820672207 | 1979 | 1.9709819467904 | 1978 | 2.0882007792498 | 1977 | 2.1324023071728 | 1976 | 2.1869606551066 | 1975 | 2.3001708809147 | 1974 | 2.3725227351369 | 1973 | 2.407010019843 | 1972 | 2.4007966722105 | 1971 | 2.4272731550945 | 1970 | 2.4653390792557 | 1969 | 2.5153138989545 | 1968 | 2.608026588594 | 1967 | 2.6636335082258 | 1966 | 2.6973643457647 | 1965 | 2.6883006882499 | 1964 | 2.6281145098742 | 1963 | 2.5893536735699 | 1962 | 2.72326137726 | 1961 | 2.8226724259186 |
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