Year	Percent
2005-01-01	81.300
2006-01-01	81.200
2007-01-01	81.900
2008-01-01	83.600
2009-01-01	83.900
2010-01-01	81.950
2011-01-01	82.850
2012-01-01	83.600
2013-01-01	83.550
2014-01-01	84.750
2015-01-01	84.825
2016-01-01	85.525
2017-01-01	85.550