Year	Percent
2003-01-01	36.900
2004-01-01	37.125
2005-01-01	37.450
2006-01-01	37.700
2007-01-01	37.825
2008-01-01	37.875
2009-01-01	37.800
2010-01-01	37.975
2011-01-01	38.325
2012-01-01	38.175
2013-01-01	38.425
2014-01-01	39.000
2015-01-01	39.100
2016-01-01	39.350
2017-01-01	39.500