Year	Percent
2005-01-01	51.575
2006-01-01	52.600
2007-01-01	53.700
2008-01-01	54.775
2009-01-01	54.625
2010-01-01	54.475
2011-01-01	54.900
2012-01-01	56.225
2013-01-01	57.375
2014-01-01	58.800
2015-01-01	60.100
2016-01-01	61.950
2017-01-01	63.675