Year Percent 2008-01-01 0.0001340000000000000 2009-01-01 0.0070799999999999995 2010-01-01 0.0284040000000000020 2011-01-01 0.0977050000000000000 2012-01-01 0.1643220000000000000 2013-01-01 1.8053900000000000000 2014-01-01 1.5950300000000000000 2015-01-01 1.1801500000000000000 2016-01-01 1.0942500000000000000