| Year | Value | | 2022 | 0.57889436683323 | | 2021 | 0.54297022878238 | | 2020 | 0.74331028150141 | | 2019 | 0.70079546442469 | | 2018 | 0.62391251468714 | | 2017 | 0.77046713572151 | | 2016 | 1.0661082087598 | | 2015 | 1.2956397488473 | | 2014 | 0.9502471395414 | | 2013 | 1.1461779767659 | | 2012 | 1.1345502757324 | | 2011 | 0.92410908032731 | | 2010 | 0.85173133913521 | | 2009 | 0.65623976502104 | | 2008 | 0.80854254376854 | | 2007 | 1.2261242868861 | | 2006 | 1.419205358118 | | 2005 | 1.3807954582531 | | 2004 | 1.3366043848227 | | 2003 | 0.88064571071437 | | 2000 | 0.22026077257231 | | 1999 | 1.1581506637851 | | 1998 | 0.4284541614111 | | 1997 | 1.4108511238115 | | 1996 | 1.5468010910472 | | 1993 | 5.2260856853008 | | 1979 | 2.972972972973E-5 | | 1978 | 3.2732240437159E-5 | | 1977 | 3.4924242424242E-5 | | 1976 | 3.3578947368421E-5 | | 1975 | 4.53125E-5 | | 1974 | 5.2666666666667E-5 | | 1973 | 3.4897959183674E-5 | | 1972 | 4.025641025641E-5 | | 1971 | 4.8571428571429E-5 | | 1970 | 5.5161290322581E-5 | | 1969 | 4.1724137931035E-5 | | 1968 | 4.215E-5 | | 1966 | 4.31E-5 | | 1964 | 3.9142857142857E-5 |
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