Year	Percent
1999-01-01	10.050
2000-01-01	6.650
2001-01-01	8.700
2002-01-01	7.450
2003-01-01	9.250
2004-01-01	7.400
2005-01-01	8.575
2006-01-01	7.475
2007-01-01	7.375
2008-01-01	8.675
2009-01-01	10.300
2010-01-01	11.750
2011-01-01	12.700
2012-01-01	13.500
2013-01-01	11.825
2014-01-01	11.475
2015-01-01	10.050
2016-01-01	10.900
2017-01-01	10.650