Year	Percent
1999-01-01	7.000
2000-01-01	6.425
2001-01-01	5.725
2002-01-01	5.825
2003-01-01	5.850
2004-01-01	6.075
2005-01-01	7.200
2006-01-01	7.475
2007-01-01	7.400
2008-01-01	7.825
2009-01-01	10.025
2010-01-01	11.150
2011-01-01	11.025
2012-01-01	11.000
2013-01-01	10.175
2014-01-01	7.725
2015-01-01	6.825
2016-01-01	5.100
2017-01-01	4.175