Year	Percent
1998-01-01	3.325
1999-01-01	3.125
2000-01-01	3.200
2001-01-01	3.125
2002-01-01	3.600
2003-01-01	4.275
2004-01-01	5.475
2005-01-01	6.075
2006-01-01	6.325
2007-01-01	6.525
2008-01-01	6.575
2009-01-01	7.625
2010-01-01	8.900
2011-01-01	10.825
2012-01-01	12.750
2013-01-01	13.700
2014-01-01	13.500
2015-01-01	12.450
2016-01-01	11.000
2017-01-01	8.550