Year Percent 1999-01-01 0.04052300000000000 2000-01-01 0.02862400000000000 2001-01-01 0.12544500000000000 2002-01-01 0.05225600000000000 2003-01-01 0.05225600000000000 2004-01-01 0.07497500000000000 2005-01-01 0.07019700000000001 2006-01-01 0.32659400000000000 2007-01-01 0.26436600000000000 2008-01-01 0.03247200000000000 2009-01-01 0.35849400000000000 2010-01-01 0.23581200000000000 2011-01-01 0.02729900000000000 2012-01-01 0.00081100000000000 2013-01-01 0.00076800000000000 2014-01-01 0.09110800000000001 2015-01-01 0.11319700000000000