Year	Percent
1999-01-01	7.350
2000-01-01	6.600
2001-01-01	5.750
2002-01-01	6.000
2003-01-01	6.450
2004-01-01	6.025
2005-01-01	6.225
2006-01-01	5.000
2007-01-01	4.100
2008-01-01	4.050
2009-01-01	6.025
2010-01-01	7.600
2011-01-01	8.350
2012-01-01	8.525
2013-01-01	9.625
2014-01-01	9.150
2015-01-01	8.175
2016-01-01	7.575
2017-01-01	5.900