Year	Percent
1999-01-01	6.100
2000-01-01	4.925
2001-01-01	4.975
2002-01-01	5.725
2003-01-01	6.475
2004-01-01	6.550
2005-01-01	6.550
2006-01-01	6.525
2007-01-01	5.950
2008-01-01	5.650
2009-01-01	6.675
2010-01-01	7.175
2011-01-01	6.400
2012-01-01	6.850
2013-01-01	7.525
2014-01-01	8.225
2015-01-01	8.125
2016-01-01	7.325
2017-01-01	6.275