Year	Percent
2001-01-01	43.725
2002-01-01	41.775
2003-01-01	40.375
2004-01-01	38.625
2005-01-01	38.200
2006-01-01	40.150
2007-01-01	42.025
2008-01-01	42.250
2009-01-01	37.650
2010-01-01	38.500
2011-01-01	40.800
2012-01-01	38.800
2013-01-01	40.550
2014-01-01	41.600
2015-01-01	42.425
2016-01-01	43.075
2017-01-01	43.900