Year	Percent
2003-01-01	34.825
2004-01-01	36.050
2005-01-01	37.375
2006-01-01	37.600
2007-01-01	37.575
2008-01-01	37.250
2009-01-01	38.500
2010-01-01	39.475
2011-01-01	41.225
2012-01-01	44.250
2013-01-01	46.000
2014-01-01	48.500
2015-01-01	50.275
2016-01-01	51.375
2017-01-01	52.975