Year	Percent
2005-01-01	49.375
2006-01-01	50.325
2007-01-01	51.275
2008-01-01	51.900
2009-01-01	51.500
2010-01-01	51.325
2011-01-01	51.500
2012-01-01	51.575
2013-01-01	51.625
2014-01-01	52.175
2015-01-01	52.775
2016-01-01	53.575
2017-01-01	54.375