Year	Percent
2000-01-01	60.100
2001-01-01	61.750
2002-01-01	62.550
2003-01-01	64.750
2004-01-01	65.650
2005-01-01	65.950
2006-01-01	65.950
2007-01-01	66.200
2008-01-01	67.200
2009-01-01	66.150
2010-01-01	65.075
2011-01-01	64.125
2012-01-01	65.425
2013-01-01	66.825
2014-01-01	67.800
2015-01-01	68.625
2016-01-01	69.550
2017-01-01	69.250