Year	Percent
1999-01-01	36.125
2000-01-01	39.700
2001-01-01	40.750
2002-01-01	40.125
2003-01-01	39.725
2004-01-01	39.525
2005-01-01	38.025
2006-01-01	38.125
2007-01-01	37.125
2008-01-01	37.125
2009-01-01	37.125
2010-01-01	37.375
2011-01-01	36.350
2012-01-01	36.850
2013-01-01	37.725
2014-01-01	39.300
2015-01-01	39.300
2016-01-01	39.775
2017-01-01	41.575