Year	Percent
2005-01-01	56.850
2006-01-01	57.150
2007-01-01	57.225
2008-01-01	57.450
2009-01-01	57.400
2010-01-01	57.350
2011-01-01	57.325
2012-01-01	57.575
2013-01-01	57.575
2014-01-01	57.600
2015-01-01	57.550
2016-01-01	57.750
2017-01-01	57.950