Year	Percent
2005-01-01	20.900
2006-01-01	19.725
2007-01-01	19.400
2008-01-01	19.500
2009-01-01	19.025
2010-01-01	18.675
2011-01-01	17.850
2012-01-01	17.750
2013-01-01	17.550
2014-01-01	17.525
2015-01-01	17.500
2016-01-01	17.375
2017-01-01	17.475