Year	Percent
2000-01-01	57.350
2001-01-01	58.100
2002-01-01	58.275
2003-01-01	59.875
2004-01-01	60.725
2005-01-01	63.100
2006-01-01	65.575
2007-01-01	66.250
2008-01-01	66.600
2009-01-01	63.225
2010-01-01	60.800
2011-01-01	62.975
2012-01-01	64.725
2013-01-01	65.700
2014-01-01	66.325
2015-01-01	68.475
2016-01-01	68.600
2017-01-01	70.925