Year	Percent
2003-01-01	75.450
2004-01-01	71.800
2005-01-01	74.250
2006-01-01	76.975
2007-01-01	80.175
2008-01-01	76.850
2009-01-01	70.825
2010-01-01	71.350
2011-01-01	71.650
2012-01-01	73.525
2013-01-01	74.775
2014-01-01	77.575
2015-01-01	78.450
2016-01-01	82.575
2017-01-01	82.125