Year	Percent
2006-01-01	20.975
2007-01-01	21.000
2008-01-01	21.625
2009-01-01	22.275
2010-01-01	24.025
2011-01-01	25.575
2012-01-01	26.300
2013-01-01	27.100
2014-01-01	26.675
2015-01-01	27.450
2016-01-01	28.000
2017-01-01	28.875