| Year | Value | | 2021 | 53.6270365 | | 2020 | 45.14804292 | | 2019 | 42.99166167 | | 2018 | 32.9863863 | | 2017 | 25.30959816 | | 2016 | 19.41939784 | | 2015 | 14.9 | | 2014 | 12.25 | | 2013 | 11.5 | | 2012 | 10.74679768 | | 2011 | 10 | | 2010 | 9.07 | | 2009 | 8.97 | | 2008 | 7 | | 2007 | 6 | | 2006 | 4.5 | | 2005 | 4 | | 2004 | 3.5 | | 2003 | 3 | | 2002 | 2.5 | | 2001 | 2.337458948 | | 2000 | 1.785225474 | | 1999 | 1.211577838 | | 1998 | 0.616545618 |
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