Year	Percent
1998-01-01	35.525
1999-01-01	35.450
2000-01-01	35.900
2001-01-01	36.250
2002-01-01	36.250
2003-01-01	36.575
2004-01-01	36.700
2005-01-01	36.225
2006-01-01	36.275
2007-01-01	36.600
2008-01-01	36.875
2009-01-01	36.650
2010-01-01	36.900
2011-01-01	36.925
2012-01-01	36.500
2013-01-01	35.650
2014-01-01	35.600
2015-01-01	35.375
2016-01-01	34.675
2017-01-01	34.275