| Year | Value | | 2020 | 0.00060125368292522 | | 2017 | 8.580589372082E-5 | | 2016 | 0.00037182984905316 | | 2015 | 0.00017031310574251 | | 2014 | 0.00035410437237799 | | 2013 | 1.5259983345453 | | 2012 | 2.6860226782984 | | 2011 | 2.7561970227768 | | 2010 | 2.5281371321184 | | 2009 | 2.6458269486158 | | 2008 | 2.6691013809527 | | 2007 | 2.4539580156937 | | 2006 | 2.5818230224636 | | 2005 | 2.8149301105218 | | 2004 | 3.0870928182242 | | 2003 | 3.6543741707666 | | 2002 | 4.4429012489273 | | 2001 | 7.7973711795196 | | 2000 | 9.4812181078634 | | 1999 | 11.251916341724 | | 1998 | 10.713295323562 | | 1997 | 14.533683274723 | | 1996 | 13.548838647299 | | 1995 | 14.630935621758 | | 1994 | 14.839080895136 | | 1993 | 14.636827771161 | | 1992 | 18.616842026435 | | 1991 | 7.6267316182067 |
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