Year	Percent
1999-01-01	16.325
2000-01-01	18.975
2001-01-01	19.825
2002-01-01	18.700
2003-01-01	17.450
2004-01-01	17.475
2005-01-01	15.475
2006-01-01	12.325
2007-01-01	9.925
2008-01-01	8.400
2009-01-01	11.400
2010-01-01	14.250
2011-01-01	13.700
2012-01-01	13.575
2013-01-01	14.025
2014-01-01	12.875
2015-01-01	10.400
2016-01-01	8.800
2017-01-01	7.975