Year	Percent
2003-01-01	38.700
2004-01-01	39.750
2005-01-01	40.375
2006-01-01	40.075
2007-01-01	39.975
2008-01-01	39.750
2009-01-01	41.175
2010-01-01	42.150
2011-01-01	43.875
2012-01-01	47.400
2013-01-01	49.050
2014-01-01	50.700
2015-01-01	52.575
2016-01-01	53.650
2017-01-01	54.850