Year	Percent
1998-01-01	8.200
1999-01-01	10.500
2000-01-01	10.600
2001-01-01	9.875
2002-01-01	9.050
2003-01-01	9.925
2004-01-01	9.950
2005-01-01	9.850
2006-01-01	8.900
2007-01-01	6.800
2008-01-01	5.675
2009-01-01	7.825
2010-01-01	8.525
2011-01-01	7.975
2012-01-01	8.300
2013-01-01	8.375
2014-01-01	7.500
2015-01-01	6.175
2016-01-01	4.775
2017-01-01	3.650