Year | Value | 2017 | 21.96 | 2016 | 20.47 | 2015 | 18.98 | 2014 | 17.49 | 2013 | 16 | 2012 | 14.51 | 2011 | 13.03 | 2010 | 11.55 | 2009 | 10.07 | 2008 | 8.78 | 2007 | 7.197619518 | 2006 | 3.772406207 | 2005 | 0.298690024 | 2004 | 0.077479907 | 2003 | 0.064583777 | 2002 | 0.055462827 | 2001 | 0.051259133 | 2000 | 0.048599595 | 1999 | 0.032791858 |
|