Year	Percent
1999-01-01	3.475
2000-01-01	3.675
2001-01-01	3.750
2002-01-01	3.875
2003-01-01	2.900
2004-01-01	3.275
2005-01-01	4.225
2006-01-01	4.050
2007-01-01	4.750
2008-01-01	5.150
2009-01-01	6.650
2010-01-01	8.550
2011-01-01	10.050
2012-01-01	8.775
2013-01-01	8.575
2014-01-01	6.725
2015-01-01	5.950
2016-01-01	4.325
2017-01-01	3.025