Year Percent 2007-01-01 0.0030000000000000 2008-01-01 0.1780070000000000 2009-01-01 0.5165029999999999 2010-01-01 0.8898149999999999 2011-01-01 1.2294100000000001 2012-01-01 1.7450200000000000 2013-01-01 2.3480100000000000 2014-01-01 3.0241000000000000