Year	Percent
2005-01-01	47.575
2006-01-01	46.850
2007-01-01	46.000
2008-01-01	45.275
2009-01-01	45.700
2010-01-01	46.275
2011-01-01	45.225
2012-01-01	46.775
2013-01-01	47.125
2014-01-01	47.975
2015-01-01	49.550
2016-01-01	49.075
2017-01-01	48.725