Year Percent 2007-01-01 0.01 2008-01-01 0.01 2009-01-01 0.01 2010-01-01 0.01 2011-01-01 0.01 2012-01-01 0.02 2013-01-01 0.03 2014-01-01 0.04 2015-01-01 0.06