Year	Percent
2001-01-01	44.675
2002-01-01	43.850
2003-01-01	42.100
2004-01-01	39.700
2005-01-01	39.725
2006-01-01	40.400
2007-01-01	42.275
2008-01-01	42.075
2009-01-01	38.875
2010-01-01	39.175
2011-01-01	41.025
2012-01-01	41.575
2013-01-01	42.875
2014-01-01	44.025
2015-01-01	45.500
2016-01-01	45.950
2017-01-01	45.975