Year Percent 2008-01-01 6.9000000000000000 2009-01-01 4.9000000000000000 2010-01-01 6.1181300000000010 2011-01-01 5.2952600000000000 2012-01-01 5.6170599999999995 2013-01-01 6.4146199999999990 2014-01-01 10.3060000000000000 2015-01-01 10.1139999999999990 2016-01-01 10.4374000000000000