Year	Percent
2000-01-01	40.450
2001-01-01	40.050
2002-01-01	39.950
2003-01-01	39.750
2004-01-01	39.200
2005-01-01	38.025
2006-01-01	36.850
2007-01-01	33.375
2008-01-01	34.075
2009-01-01	35.925
2010-01-01	37.375
2011-01-01	38.025
2012-01-01	38.350
2013-01-01	38.050
2014-01-01	38.250
2015-01-01	38.175
2016-01-01	37.825
2017-01-01	38.000