Year	Percent
1997-01-01	8.875
1998-01-01	8.375
1999-01-01	10.200
2000-01-01	13.300
2001-01-01	12.200
2002-01-01	10.025
2003-01-01	9.875
2004-01-01	9.150
2005-01-01	6.900
2006-01-01	5.600
2007-01-01	3.775
2008-01-01	5.100
2009-01-01	10.325
2010-01-01	14.100
2011-01-01	11.575
2012-01-01	9.100
2013-01-01	8.175
2014-01-01	6.825
2015-01-01	6.125
2016-01-01	6.050
2017-01-01	5.300