Year	Percent
1999-01-01	4.000
2000-01-01	3.500
2001-01-01	3.475
2002-01-01	3.850
2003-01-01	4.225
2004-01-01	4.350
2005-01-01	3.700
2006-01-01	2.425
2007-01-01	2.700
2008-01-01	2.475
2009-01-01	5.775
2010-01-01	7.275
2011-01-01	6.350
2012-01-01	6.625
2013-01-01	5.725
2014-01-01	5.375
2015-01-01	5.425
2016-01-01	4.800
2017-01-01	4.950