Year	Percent
2005-01-01	77.375
2006-01-01	78.800
2007-01-01	80.275
2008-01-01	80.950
2009-01-01	80.775
2010-01-01	81.600
2011-01-01	82.975
2012-01-01	83.325
2013-01-01	83.425
2014-01-01	83.475
2015-01-01	83.725
2016-01-01	83.925
2017-01-01	84.225