Year	Percent
2000-01-01	38.975
2001-01-01	40.175
2002-01-01	43.275
2003-01-01	45.500
2004-01-01	46.875
2005-01-01	48.100
2006-01-01	49.575
2007-01-01	52.750
2008-01-01	54.750
2009-01-01	56.850
2010-01-01	55.900
2011-01-01	57.900
2012-01-01	60.825
2013-01-01	63.475
2014-01-01	64.875
2015-01-01	67.100
2016-01-01	68.375
2017-01-01	69.525