Year	Percent
1999-01-01	7.050
2000-01-01	6.425
2001-01-01	5.750
2002-01-01	5.850
2003-01-01	5.900
2004-01-01	6.100
2005-01-01	7.200
2006-01-01	7.550
2007-01-01	7.450
2008-01-01	7.850
2009-01-01	10.100
2010-01-01	11.250
2011-01-01	11.125
2012-01-01	11.075
2013-01-01	10.250
2014-01-01	7.750
2015-01-01	6.850
2016-01-01	5.150
2017-01-01	4.200