Year	Percent
2000-01-01	40.250
2001-01-01	40.325
2002-01-01	41.200
2003-01-01	41.900
2004-01-01	41.800
2005-01-01	41.375
2006-01-01	42.275
2007-01-01	42.400
2008-01-01	41.650
2009-01-01	40.775
2010-01-01	40.300
2011-01-01	39.950
2012-01-01	39.475
2013-01-01	39.275
2014-01-01	38.825
2015-01-01	38.925
2016-01-01	38.625
2017-01-01	38.400