Year	Percent
2006-01-01	14.925
2007-01-01	14.825
2008-01-01	15.025
2009-01-01	16.250
2010-01-01	17.250
2011-01-01	18.125
2012-01-01	18.250
2013-01-01	18.675
2014-01-01	17.925
2015-01-01	18.300
2016-01-01	18.675
2017-01-01	19.250