Year	Percent
1999-01-01	6.275
2000-01-01	5.650
2001-01-01	4.975
2002-01-01	5.425
2003-01-01	5.575
2004-01-01	6.100
2005-01-01	7.450
2006-01-01	7.900
2007-01-01	7.775
2008-01-01	8.000
2009-01-01	9.750
2010-01-01	10.675
2011-01-01	11.000
2012-01-01	10.600
2013-01-01	10.150
2014-01-01	7.900
2015-01-01	7.025
2016-01-01	5.125
2017-01-01	4.575