Year	Percent
1999-01-01	6.525
2000-01-01	5.250
2001-01-01	5.100
2002-01-01	5.025
2003-01-01	6.100
2004-01-01	6.050
2005-01-01	5.325
2006-01-01	4.575
2007-01-01	4.225
2008-01-01	3.775
2009-01-01	5.375
2010-01-01	6.550
2011-01-01	7.575
2012-01-01	7.675
2013-01-01	7.375
2014-01-01	6.950
2015-01-01	6.525
2016-01-01	6.775
2017-01-01	6.050