Year | Value | 2017 | 26.71835477 | 2016 | 24.57920836 | 2015 | 24.08540947 | 2014 | 22.55 | 2013 | 20 | 2012 | 17.4465 | 2011 | 14.905 | 2010 | 12.35 | 2009 | 9.96 | 2008 | 6.89 | 2007 | 5.01 | 2006 | 1.247824049 | 2005 | 1.048597934 | 2004 | 0.881222989 | 2003 | 0.6047341 | 2002 | 0.518796032 | 2001 | 0.090802459 | 2000 | 0.082500387 | 1999 | 0.056628675 | 1998 | 0.023323243 | 1997 | 0.015025295 | 1996 | 0.000621081 |
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