Year	Percent
1999-01-01	42.400
2000-01-01	39.825
2001-01-01	38.825
2002-01-01	37.700
2003-01-01	37.125
2004-01-01	37.700
2005-01-01	37.075
2006-01-01	36.700
2007-01-01	37.225
2008-01-01	35.300
2009-01-01	36.375
2010-01-01	36.350
2011-01-01	36.450
2012-01-01	36.400
2013-01-01	36.675
2014-01-01	35.750
2015-01-01	33.775
2016-01-01	33.000
2017-01-01	32.175