| Year | Value | | 2021 | 22.38613931 | | 2020 | 21.46379477 | | 2019 | 16.61190218 | | 2017 | 10.22431156 | | 2016 | 4.32275803 | | 2015 | 2.476219975 | | 2014 | 1.248675689 | | 2013 | 1.15 | | 2012 | 1.05 | | 2011 | 0.9 | | 2010 | 0.83 | | 2009 | 0.76 | | 2008 | 0.7 | | 2007 | 0.39039062 | | 2006 | 0.294033977 | | 2005 | 0.221341351 | | 2004 | 0.189933734 | | 2003 | 0.155698704 | | 2002 | 0.127152469 | | 2001 | 0.105185431 | | 2000 | 0.036261294 | | 1999 | 0.028136022 | | 1998 | 0.002911503 | | 1997 | 0.002008766 | | 1996 | 0.001039305 |
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