Year	Percent
2003-01-01	40.100
2004-01-01	38.800
2005-01-01	39.400
2006-01-01	38.900
2007-01-01	36.350
2008-01-01	39.625
2009-01-01	47.700
2010-01-01	48.800
2011-01-01	48.425
2012-01-01	48.325
2013-01-01	50.450
2014-01-01	52.075
2015-01-01	45.450
2016-01-01	49.100
2017-01-01	46.875