Year	Percent
2005-01-01	80.575
2006-01-01	81.275
2007-01-01	81.725
2008-01-01	82.000
2009-01-01	82.175
2010-01-01	82.450
2011-01-01	82.675
2012-01-01	82.550
2013-01-01	82.600
2014-01-01	82.525
2015-01-01	82.150
2016-01-01	82.150
2017-01-01	82.375