Year	Percent
2008-01-01	3.8716300000000000
2009-01-01	4.5447200000000000
2010-01-01	4.0483600000000000
2011-01-01	3.4720600000000000
2012-01-01	3.1764200000000002
2013-01-01	3.0307600000000000
2014-01-01	2.9954800000000000
2015-01-01	3.5046199999999996
2016-01-01	3.4318000000000000