Year	Percent
2000-01-01	40.400
2001-01-01	39.550
2002-01-01	38.750
2003-01-01	39.675
2004-01-01	39.050
2005-01-01	40.850
2006-01-01	42.500
2007-01-01	44.750
2008-01-01	46.750
2009-01-01	47.475
2010-01-01	48.900
2011-01-01	51.600
2012-01-01	53.525
2013-01-01	55.925
2014-01-01	57.200
2015-01-01	57.550
2016-01-01	58.650
2017-01-01	60.800