Year Percent 2003-01-01 0.11051099999999998 2004-01-01 0.15006900000000000 2005-01-01 0.28856100000000000 2006-01-01 0.18595000000000000 2007-01-01 0.16861500000000001 2008-01-01 0.20324900000000000 2009-01-01 0.17356700000000000 2010-01-01 0.14268599999999998 2011-01-01 0.13526600000000000 2012-01-01 0.14799000000000000 2013-01-01 0.14713600000000000 2014-01-01 0.12690000000000000 2015-01-01 0.11408900000000001