Year	Percent
1997-01-01	9.625
1998-01-01	9.175
1999-01-01	11.375
2000-01-01	14.650
2001-01-01	13.000
2002-01-01	11.225
2003-01-01	10.325
2004-01-01	10.125
2005-01-01	8.025
2006-01-01	5.925
2007-01-01	4.600
2008-01-01	5.425
2009-01-01	13.575
2010-01-01	16.700
2011-01-01	12.325
2012-01-01	10.000
2013-01-01	8.625
2014-01-01	7.325
2015-01-01	6.175
2016-01-01	6.775
2017-01-01	5.775