Year	Percent
1999-01-01	39.250
2000-01-01	39.000
2001-01-01	38.475
2002-01-01	38.850
2003-01-01	39.650
2004-01-01	37.175
2005-01-01	36.475
2006-01-01	36.250
2007-01-01	35.825
2008-01-01	35.700
2009-01-01	35.650
2010-01-01	35.700
2011-01-01	36.875
2012-01-01	37.025
2013-01-01	37.100
2014-01-01	36.575
2015-01-01	36.675
2016-01-01	37.225
2017-01-01	35.125