Year	Percent
1999-01-01	13.050
2000-01-01	15.450
2001-01-01	15.875
2002-01-01	15.325
2003-01-01	15.050
2004-01-01	16.075
2005-01-01	14.450
2006-01-01	11.850
2007-01-01	10.225
2008-01-01	8.750
2009-01-01	10.800
2010-01-01	12.825
2011-01-01	12.125
2012-01-01	12.375
2013-01-01	12.850
2014-01-01	12.025
2015-01-01	10.500
2016-01-01	8.650
2017-01-01	7.600