Year	Percent
1999-01-01	12.925
2000-01-01	12.550
2001-01-01	12.050
2002-01-01	11.875
2003-01-01	12.475
2004-01-01	11.400
2005-01-01	11.200
2006-01-01	10.950
2007-01-01	10.675
2008-01-01	9.900
2009-01-01	10.375
2010-01-01	10.025
2011-01-01	9.850
2012-01-01	9.225
2013-01-01	9.300
2014-01-01	9.650
2015-01-01	9.175
2016-01-01	9.525
2017-01-01	8.175