Year	Percent
2005-01-01	8.300
2006-01-01	8.025
2007-01-01	8.125
2008-01-01	8.050
2009-01-01	8.275
2010-01-01	8.225
2011-01-01	8.375
2012-01-01	8.225
2013-01-01	8.475
2014-01-01	8.525
2015-01-01	8.575
2016-01-01	8.600
2017-01-01	8.400