Year	Percent
1999-01-01	7.600
2000-01-01	6.900
2001-01-01	6.300
2002-01-01	6.450
2003-01-01	6.800
2004-01-01	6.450
2005-01-01	6.675
2006-01-01	6.100
2007-01-01	4.950
2008-01-01	4.450
2009-01-01	6.000
2010-01-01	7.425
2011-01-01	8.350
2012-01-01	9.000
2013-01-01	10.250
2014-01-01	9.900
2015-01-01	9.100
2016-01-01	8.125
2017-01-01	6.675