Year	Percent
2005-01-01	40.575
2006-01-01	40.675
2007-01-01	40.700
2008-01-01	40.775
2009-01-01	40.350
2010-01-01	39.750
2011-01-01	39.525
2012-01-01	39.425
2013-01-01	39.300
2014-01-01	38.900
2015-01-01	38.800
2016-01-01	39.000
2017-01-01	39.175