Year Percent 2007-01-01 0.07320200000000000 2008-01-01 0.06669000000000000 2009-01-01 0.17156600000000000 2010-01-01 0.27790800000000000 2011-01-01 0.44394700000000004 2012-01-01 1.77919000000000000 2013-01-01 3.41909000000000000 2014-01-01 3.97684000000000000 2015-01-01 5.59055000000000000 2016-01-01 7.63840000000000000