Year	Percent
2000-01-01	39.250
2001-01-01	42.375
2002-01-01	47.000
2003-01-01	47.825
2004-01-01	52.275
2005-01-01	55.075
2006-01-01	59.350
2007-01-01	60.675
2008-01-01	60.525
2009-01-01	61.150
2010-01-01	55.275
2011-01-01	57.825
2012-01-01	61.500
2013-01-01	63.550
2014-01-01	63.100
2015-01-01	65.725
2016-01-01	66.475
2017-01-01	69.275