Year	Percent
1998-01-01	44.000
1999-01-01	42.925
2000-01-01	42.075
2001-01-01	40.675
2002-01-01	39.650
2003-01-01	39.075
2004-01-01	36.125
2005-01-01	36.300
2006-01-01	35.625
2007-01-01	35.875
2008-01-01	34.725
2009-01-01	35.425
2010-01-01	35.500
2011-01-01	35.325
2012-01-01	33.525
2013-01-01	33.900
2014-01-01	33.625
2015-01-01	34.125
2016-01-01	33.225
2017-01-01	32.700