Year	Percent
1998-01-01	10.100
1999-01-01	9.425
2000-01-01	9.225
2001-01-01	9.125
2002-01-01	9.500
2003-01-01	9.950
2004-01-01	9.875
2005-01-01	9.750
2006-01-01	9.750
2007-01-01	9.600
2008-01-01	8.750
2009-01-01	9.350
2010-01-01	9.500
2011-01-01	9.125
2012-01-01	9.625
2013-01-01	9.925
2014-01-01	10.450
2015-01-01	10.450
2016-01-01	10.300
2017-01-01	10.225