Year	Percent
1998-01-01	38.825
1999-01-01	38.350
2000-01-01	38.400
2001-01-01	36.600
2002-01-01	35.475
2003-01-01	34.575
2004-01-01	36.225
2005-01-01	33.850
2006-01-01	32.325
2007-01-01	30.825
2008-01-01	30.750
2009-01-01	28.825
2010-01-01	28.100
2011-01-01	27.100
2012-01-01	28.550
2013-01-01	27.125
2014-01-01	27.125
2015-01-01	26.200
2016-01-01	26.600
2017-01-01	26.175