Year Percent 2006-01-01 0.052646000000000005 2007-01-01 0.025810000000000003 2008-01-01 0.017438000000000000 2009-01-01 0.026114000000000000 2010-01-01 0.015244000000000000 2011-01-01 0.014259000000000000 2012-01-01 0.006813000000000000 2013-01-01 0.007289000000000000