Year	Percent
1998-01-01	13.050
1999-01-01	10.250
2000-01-01	9.150
2001-01-01	9.125
2002-01-01	8.175
2003-01-01	7.675
2004-01-01	7.250
2005-01-01	6.875
2006-01-01	6.800
2007-01-01	6.350
2008-01-01	5.375
2009-01-01	6.225
2010-01-01	6.525
2011-01-01	6.400
2012-01-01	6.575
2013-01-01	6.950
2014-01-01	7.250
2015-01-01	8.025
2016-01-01	7.525
2017-01-01	7.825