Year	Percent
1999-01-01	6.325
2000-01-01	6.150
2001-01-01	6.025
2002-01-01	6.600
2003-01-01	5.850
2004-01-01	6.225
2005-01-01	6.200
2006-01-01	6.025
2007-01-01	6.900
2008-01-01	6.625
2009-01-01	6.450
2010-01-01	7.075
2011-01-01	6.525
2012-01-01	6.275
2013-01-01	6.375
2014-01-01	5.950
2015-01-01	6.375
2016-01-01	6.500
2017-01-01	6.875