Year	Percent
1998-01-01	12.175
1999-01-01	16.300
2000-01-01	18.925
2001-01-01	19.800
2002-01-01	18.650
2003-01-01	17.375
2004-01-01	17.400
2005-01-01	15.475
2006-01-01	12.300
2007-01-01	9.925
2008-01-01	8.375
2009-01-01	11.375
2010-01-01	14.225
2011-01-01	13.600
2012-01-01	13.525
2013-01-01	13.975
2014-01-01	12.850
2015-01-01	10.325
2016-01-01	8.800
2017-01-01	7.925