Year	Percent
1999-01-01	9.000
2000-01-01	7.600
2001-01-01	6.500
2002-01-01	7.750
2003-01-01	7.775
2004-01-01	8.350
2005-01-01	8.400
2006-01-01	8.125
2007-01-01	7.375
2008-01-01	6.600
2009-01-01	6.875
2010-01-01	7.450
2011-01-01	6.325
2012-01-01	6.600
2013-01-01	7.175
2014-01-01	6.975
2015-01-01	7.150
2016-01-01	6.900
2017-01-01	6.225