Year Percent 2008-01-01 0.0039900000000000000 2009-01-01 0.0044329999999999994 2010-01-01 0.0059120000000000000 2011-01-01 0.0069900000000000006 2012-01-01 0.0084930000000000000 2013-01-01 0.0094560000000000000 2014-01-01 0.0141680000000000000 2015-01-01 0.0177620000000000000 2016-01-01 0.0269050000000000020