Year	Percent
2006-01-01	31.150
2007-01-01	31.200
2008-01-01	30.750
2009-01-01	30.575
2010-01-01	30.100
2011-01-01	29.050
2012-01-01	29.675
2013-01-01	29.125
2014-01-01	28.775
2015-01-01	28.425
2016-01-01	28.050
2017-01-01	27.575