| Year | Value | | 2021 | 17.37283681 | | 2020 | 16.31226657 | | 2019 | 14.63855268 | | 2018 | 10.9 | | 2017 | 7.796326608 | | 2016 | 7 | | 2015 | 6.5 | | 2014 | 6 | | 2013 | 5.5 | | 2012 | 5 | | 2011 | 4.6 | | 2010 | 4.17 | | 2009 | 2.68 | | 2008 | 1.56 | | 2007 | 0.91 | | 2006 | 0.842954488 | | 2005 | 0.854357118 | | 2004 | 0.679447835 | | 2003 | 0.419538844 | | 2002 | 0.259612611 | | 2001 | 0.160031947 | | 2000 | 0.10959253 | | 1999 | 0.056250629 | | 1998 | 0.020197055 | | 1997 | 0.011842611 | | 1996 | 0.003042979 |
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