Year	Percent
1998-01-01	8.200
1999-01-01	10.475
2000-01-01	10.550
2001-01-01	9.850
2002-01-01	9.025
2003-01-01	9.875
2004-01-01	9.925
2005-01-01	9.800
2006-01-01	8.850
2007-01-01	6.750
2008-01-01	5.625
2009-01-01	7.725
2010-01-01	8.475
2011-01-01	7.875
2012-01-01	8.225
2013-01-01	8.275
2014-01-01	7.400
2015-01-01	6.075
2016-01-01	4.700
2017-01-01	3.600