Year	Percent
2003-01-01	41.600
2004-01-01	42.200
2005-01-01	43.700
2006-01-01	46.300
2007-01-01	48.000
2008-01-01	45.125
2009-01-01	46.850
2010-01-01	47.225
2011-01-01	47.100
2012-01-01	48.800
2013-01-01	49.125
2014-01-01	50.375
2015-01-01	50.575
2016-01-01	49.975
2017-01-01	51.950