Year	Percent
2005-01-01	83.925
2006-01-01	84.450
2007-01-01	84.700
2008-01-01	85.050
2009-01-01	85.075
2010-01-01	85.225
2011-01-01	85.225
2012-01-01	85.600
2013-01-01	85.550
2014-01-01	85.400
2015-01-01	85.350
2016-01-01	85.450
2017-01-01	85.475