Year	Percent
1999-01-01	7.900
2000-01-01	7.200
2001-01-01	6.975
2002-01-01	6.975
2003-01-01	7.225
2004-01-01	6.975
2005-01-01	7.200
2006-01-01	7.375
2007-01-01	6.000
2008-01-01	4.925
2009-01-01	5.950
2010-01-01	7.175
2011-01-01	8.350
2012-01-01	9.525
2013-01-01	11.100
2014-01-01	10.800
2015-01-01	10.200
2016-01-01	8.700
2017-01-01	7.575