Year	Percent
2000-01-01	63.475
2001-01-01	65.275
2002-01-01	66.175
2003-01-01	66.050
2004-01-01	65.825
2005-01-01	66.400
2006-01-01	67.650
2007-01-01	69.575
2008-01-01	71.125
2009-01-01	71.525
2010-01-01	69.325
2011-01-01	68.925
2012-01-01	69.400
2013-01-01	68.950
2014-01-01	68.075
2015-01-01	69.175
2016-01-01	70.050
2017-01-01	71.300