Year Percent 2000-01-01 0.09415499999999999 2001-01-01 0.07661000000000000 2002-01-01 0.10089100000000000 2003-01-01 0.10876800000000000 2004-01-01 0.15685700000000000 2005-01-01 0.09917700000000000 2006-01-01 0.10055900000000001 2007-01-01 0.10782200000000000 2008-01-01 0.10253000000000000 2009-01-01 0.19488000000000000 2010-01-01 0.19376900000000000 2011-01-01 0.20233099999999998 2012-01-01 0.21786100000000000 2013-01-01 0.22358499999999998 2014-01-01 0.18826600000000002 2015-01-01 0.01904600000000000