Year	Percent
1997-01-01	10.350
1998-01-01	9.900
1999-01-01	12.500
2000-01-01	15.850
2001-01-01	13.750
2002-01-01	12.325
2003-01-01	10.800
2004-01-01	11.100
2005-01-01	9.175
2006-01-01	6.250
2007-01-01	5.400
2008-01-01	5.750
2009-01-01	16.700
2010-01-01	19.275
2011-01-01	13.075
2012-01-01	10.925
2013-01-01	9.075
2014-01-01	7.850
2015-01-01	6.275
2016-01-01	7.425
2017-01-01	6.175