Year	Percent
1998-01-01	16.325
1999-01-01	15.750
2000-01-01	14.525
2001-01-01	13.000
2002-01-01	12.225
2003-01-01	11.650
2004-01-01	10.475
2005-01-01	10.050
2006-01-01	8.775
2007-01-01	7.850
2008-01-01	8.525
2009-01-01	9.225
2010-01-01	9.600
2011-01-01	9.550
2012-01-01	11.825
2013-01-01	13.050
2014-01-01	13.800
2015-01-01	12.700
2016-01-01	12.775
2017-01-01	12.375