Year | Value | 2020 | 18 | 2019 | 16.8 | 2018 | 15.8 | 2017 | 13.23693043 | 2016 | 11.77318438 | 2015 | 6.344421603 | 2014 | 6.057298984 | 2013 | 4 | 2012 | 2.5 | 2011 | 0.9 | 2010 | 0.58 | 2009 | 0.26 | 2008 | 0.25 | 2007 | 0.239834699 | 2006 | 0.227669467 | 2005 | 0.21539161 | 2004 | 0.203007681 | 2003 | 0.190173282 | 2002 | 0.176198957 | 2001 | 0.160264445 | 2000 | 0.118254246 | 1999 | 0.048490656 | 1998 | 0.014805065 | 1997 | 0.004987835 | 1996 | 0.002506116 |
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