Year Percent 2001 0.00264 2002 0.01091 2003 0.52145 2004 0.25903 2005 0.23919 2006 0.51 2007 0.38233 2008 0.27528 2009 0.37447 2010 0.35747 2011 0.31646 2012 0.21567 2013 0.35562 2014 1.20914 2015 4.69585