Year	Percent
2001-01-01	44.175
2002-01-01	42.775
2003-01-01	41.250
2004-01-01	39.125
2005-01-01	38.950
2006-01-01	40.275
2007-01-01	42.150
2008-01-01	42.150
2009-01-01	38.250
2010-01-01	38.825
2011-01-01	40.900
2012-01-01	40.175
2013-01-01	41.675
2014-01-01	42.750
2015-01-01	43.900
2016-01-01	44.450
2017-01-01	44.925