Year	Percent
1999-01-01	5.825
2000-01-01	5.000
2001-01-01	4.525
2002-01-01	4.575
2003-01-01	5.650
2004-01-01	5.850
2005-01-01	4.550
2006-01-01	4.000
2007-01-01	3.550
2008-01-01	2.825
2009-01-01	4.600
2010-01-01	5.875
2011-01-01	6.925
2012-01-01	6.800
2013-01-01	6.850
2014-01-01	6.425
2015-01-01	6.100
2016-01-01	6.350
2017-01-01	5.550