Year	Percent
2005-01-01	3.88392272044020
2006-01-01	3.67208383632201
2007-01-01	3.76053528000932
2008-01-01	3.65027933933097
2009-01-01	5.27727009596545
2010-01-01	4.30788044200712
2011-01-01	3.87562877297544
2012-01-01	3.46923597735145
2013-01-01	2.92308761537309
2014-01-01	3.57901983573307
2015-01-01	3.04967432650071
2016-01-01	3.92607540565250
2017-01-01	3.99145897487041