Year	Percent
2006-01-01	76.600
2007-01-01	76.525
2008-01-01	75.625
2009-01-01	75.100
2010-01-01	74.475
2011-01-01	73.825
2012-01-01	74.775
2013-01-01	73.200
2014-01-01	72.350
2015-01-01	70.450
2016-01-01	69.650
2017-01-01	69.025