Year	Percent
2000-01-01	43.750
2001-01-01	42.750
2002-01-01	41.500
2003-01-01	41.225
2004-01-01	41.400
2005-01-01	41.950
2006-01-01	43.175
2007-01-01	45.350
2008-01-01	47.025
2009-01-01	47.525
2010-01-01	47.275
2011-01-01	47.325
2012-01-01	47.575
2013-01-01	47.525
2014-01-01	48.775
2015-01-01	49.775
2016-01-01	50.650
2017-01-01	51.425