Year	Percent
2006-01-01	23.400
2007-01-01	23.475
2008-01-01	24.375
2009-01-01	24.900
2010-01-01	25.525
2011-01-01	26.175
2012-01-01	25.225
2013-01-01	26.800
2014-01-01	27.650
2015-01-01	29.550
2016-01-01	30.350
2017-01-01	30.975