| Year | Value | | 2022 | 75.298528895439 | | 2021 | 70.288752297733 | | 2020 | 66.171357494658 | | 2019 | 60.223532854347 | | 2018 | 55.75395573123 | | 2017 | 50.056979390688 | | 2016 | 47.652824616736 | | 2015 | 44.118877014527 | | 2014 | 41.171347367428 | | 2013 | 38.734731820219 | | 2012 | 36.138346772407 | | 2011 | 32.744426074231 | | 2010 | 29.281042077409 | | 2009 | 24.022080278451 | | 2008 | 19.473675139231 | | 2007 | 14.549585639164 | | 2006 | 10.297524743406 | | 2005 | 8.4200122403593 | | 2004 | 6.9632155149192 | | 2003 | 5.8281976136745 | | 2002 | 4.4590184261951 | | 2001 | 2.8151538476164 | | 2000 | 1.9173517167458 | | 1999 | 0.86403926409518 | | 1998 | 0.32863150838243 | | 1997 | 0.095986602830042 | | 1996 | 0.033807711869069 | | 1995 | 0.012076655946835 | | 1994 | 0.0036929093143966 | | 1993 | 0.00088639521465445 | | 1992 | 2.3674529399046E-5 | | 1991 | 1.8024948232561E-6 |
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