Year	Percent
2003-01-01	20.025
2004-01-01	19.525
2005-01-01	19.100
2006-01-01	18.700
2007-01-01	18.025
2008-01-01	17.225
2009-01-01	16.925
2010-01-01	16.650
2011-01-01	17.025
2012-01-01	16.975
2013-01-01	16.550
2014-01-01	17.000
2015-01-01	17.325
2016-01-01	17.275
2017-01-01	17.550