Year	Percent
2005-01-01	74.900
2006-01-01	74.900
2007-01-01	76.400
2008-01-01	77.000
2009-01-01	77.100
2010-01-01	75.575
2011-01-01	76.550
2012-01-01	76.750
2013-01-01	77.275
2014-01-01	76.425
2015-01-01	76.675
2016-01-01	77.225
2017-01-01	78.575