Year	Percent
2000-01-01	45.700
2001-01-01	46.600
2002-01-01	47.150
2003-01-01	47.475
2004-01-01	48.150
2005-01-01	49.725
2006-01-01	50.775
2007-01-01	54.175
2008-01-01	53.575
2009-01-01	50.775
2010-01-01	48.925
2011-01-01	48.100
2012-01-01	47.775
2013-01-01	48.425
2014-01-01	48.950
2015-01-01	49.950
2016-01-01	51.400
2017-01-01	52.125