Year	Percent
2005-01-01	68.900
2006-01-01	70.150
2007-01-01	71.250
2008-01-01	72.050
2009-01-01	71.475
2010-01-01	71.350
2011-01-01	71.400
2012-01-01	71.250
2013-01-01	71.150
2014-01-01	71.675
2015-01-01	72.225
2016-01-01	72.875
2017-01-01	73.725