Year % 1991 0 1995 0 1996 5.497096 1997 0 1998 0 1999 51.22525 2000 0.3937938 2001 0.3919576 2002 0.4423495 2003 0.6372017 2004 0 2005 0 2006 0 2007 0.3433078 2008 0.5448923 2009 0.4932182 2010 0 2011 1.913513 2012 1.760648 2013 6.640996 2014 5.616043 2015 7.041482 2016 0.6516693 2017 0.3616636 2018 0.3312702