| Year | Value | | 2021 | 58.75818983 | | 2020 | 53.51699827 | | 2019 | 42.32068274 | | 2018 | 35.1 | | 2017 | 24.2 | | 2016 | 24.1 | | 2015 | 17.6 | | 2014 | 11.8 | | 2013 | 6.2 | | 2012 | 5 | | 2011 | 4.5 | | 2010 | 4 | | 2009 | 2.28 | | 2008 | 1.87 | | 2007 | 1.433613196 | | 2006 | 0.979661253 | | 2005 | 0.669966475 | | 2004 | 0.481470438 | | 2003 | 0.424004896 | | 2002 | 0.363229415 | | 2001 | 0.261448552 | | 2000 | 0.192031462 | | 1999 | 0.118464464 | | 1998 | 0.040594795 | | 1997 | 0.004172527 |
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