Year	Percent
2005-01-01	51.950
2006-01-01	51.425
2007-01-01	50.975
2008-01-01	50.475
2009-01-01	50.225
2010-01-01	50.150
2011-01-01	49.925
2012-01-01	49.475
2013-01-01	49.300
2014-01-01	49.275
2015-01-01	49.250
2016-01-01	48.900
2017-01-01	48.750