Year Percent 2008-01-01 0.0001760000000000000 2009-01-01 0.0008759999999999999 2010-01-01 0.0022460000000000000 2011-01-01 0.0024930000000000000 2012-01-01 0.0029289999999999997 2013-01-01 0.0027820000000000000 2014-01-01 0.0019630000000000000 2015-01-01 0.0020469999999999998 2016-01-01 0.0012580000000000000