Year	Percent
2006-01-01	53.175
2007-01-01	53.225
2008-01-01	53.425
2009-01-01	52.850
2010-01-01	55.350
2011-01-01	57.500
2012-01-01	58.300
2013-01-01	59.100
2014-01-01	58.800
2015-01-01	59.550
2016-01-01	60.050
2017-01-01	61.150