Year	Percent
2005-01-01	56.075
2006-01-01	56.100
2007-01-01	55.625
2008-01-01	55.600
2009-01-01	56.475
2010-01-01	57.750
2011-01-01	58.125
2012-01-01	58.550
2013-01-01	59.000
2014-01-01	59.875
2015-01-01	60.275
2016-01-01	60.350
2017-01-01	60.225