Year	Percent
1999-01-01	7.225
2000-01-01	6.500
2001-01-01	5.650
2002-01-01	5.900
2003-01-01	6.350
2004-01-01	5.875
2005-01-01	6.075
2006-01-01	4.900
2007-01-01	4.000
2008-01-01	4.000
2009-01-01	5.925
2010-01-01	7.450
2011-01-01	8.225
2012-01-01	8.400
2013-01-01	9.475
2014-01-01	8.975
2015-01-01	8.075
2016-01-01	7.500
2017-01-01	5.800