Year	Percent
1998-01-01	11.475
1999-01-01	11.425
2000-01-01	11.600
2001-01-01	11.575
2002-01-01	11.800
2003-01-01	12.225
2004-01-01	12.200
2005-01-01	11.700
2006-01-01	11.850
2007-01-01	12.225
2008-01-01	12.700
2009-01-01	12.350
2010-01-01	12.175
2011-01-01	11.950
2012-01-01	11.675
2013-01-01	10.925
2014-01-01	11.250
2015-01-01	11.400
2016-01-01	11.100
2017-01-01	10.950