Year	Percent
2006-01-01	21.675
2007-01-01	21.775
2008-01-01	22.450
2009-01-01	23.200
2010-01-01	25.025
2011-01-01	26.650
2012-01-01	27.475
2013-01-01	28.300
2014-01-01	27.975
2015-01-01	28.825
2016-01-01	29.450
2017-01-01	30.350