Year	Percent
1999-01-01	12.750
2000-01-01	15.150
2001-01-01	15.975
2002-01-01	14.950
2003-01-01	14.525
2004-01-01	14.725
2005-01-01	13.275
2006-01-01	10.475
2007-01-01	8.650
2008-01-01	7.400
2009-01-01	10.000
2010-01-01	12.400
2011-01-01	11.750
2012-01-01	11.500
2013-01-01	12.200
2014-01-01	11.525
2015-01-01	9.050
2016-01-01	7.675
2017-01-01	7.300