Year	Percent
1998-01-01	14.625
1999-01-01	18.400
2000-01-01	17.300
2001-01-01	17.225
2002-01-01	17.200
2003-01-01	18.825
2004-01-01	19.500
2005-01-01	19.000
2006-01-01	18.675
2007-01-01	10.950
2008-01-01	9.900
2009-01-01	16.650
2010-01-01	18.475
2011-01-01	17.975
2012-01-01	19.000
2013-01-01	19.450
2014-01-01	17.125
2015-01-01	14.425
2016-01-01	11.375
2017-01-01	8.750