Year	Percent
2000-01-01	60.275
2001-01-01	61.075
2002-01-01	61.325
2003-01-01	62.950
2004-01-01	63.150
2005-01-01	64.825
2006-01-01	68.425
2007-01-01	69.725
2008-01-01	70.075
2009-01-01	63.775
2010-01-01	61.250
2011-01-01	65.300
2012-01-01	67.150
2013-01-01	68.475
2014-01-01	69.575
2015-01-01	71.875
2016-01-01	72.100
2017-01-01	74.125