Year	Percent
1993-01-01	8.450
1994-01-01	9.100
1995-01-01	8.800
1996-01-01	9.075
1997-01-01	9.025
1998-01-01	8.575
1999-01-01	7.925
2000-01-01	7.150
2001-01-01	6.900
2002-01-01	7.450
2003-01-01	7.925
2004-01-01	8.150
2005-01-01	8.150
2006-01-01	7.400
2007-01-01	6.575
2008-01-01	6.850
2009-01-01	9.425
2010-01-01	9.975
2011-01-01	9.950
2012-01-01	11.175
2013-01-01	11.875
2014-01-01	11.475
2015-01-01	10.725
2016-01-01	9.725
2017-01-01	8.750