Year Percent 2008-01-01 14.50280530022680 2009-01-01 3.78861330914626 2010-01-01 12.42554217351560 2011-01-01 11.16660561278740 2012-01-01 2.60245456956622 2013-01-01 4.26135250941965 2014-01-01 2.55974875844296 2015-01-01 3.55075967356746 2016-01-01 17.41804181975970 2017-01-01 15.11320738993850