Year | Value | 2020 | 35.78 | 2019 | 34.65 | 2018 | 33.77 | 2017 | 32.7 | 2016 | 31.86962727 | 2015 | 29.97979724 | 2014 | 28.09 | 2013 | 26.2 | 2012 | 24.3001 | 2011 | 22.5 | 2010 | 20.7 | 2009 | 17.3 | 2008 | 14 | 2007 | 11.5 | 2006 | 7.832551569 | 2005 | 5.648106049 | 2004 | 4.321593778 | 2003 | 3.397972614 | 2002 | 2.093101019 | 2001 | 0.35375913 | 2000 | 0.18169858 | 1999 | 0.124295462 | 1998 | 0.063687286 | 1997 | 0.032607814 |
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