Year	Percent
1998-01-01	4.400
1999-01-01	5.075
2000-01-01	5.450
2001-01-01	5.725
2002-01-01	4.900
2003-01-01	5.175
2004-01-01	6.150
2005-01-01	6.300
2006-01-01	5.650
2007-01-01	4.825
2008-01-01	4.575
2009-01-01	5.775
2010-01-01	6.525
2011-01-01	5.700
2012-01-01	5.950
2013-01-01	6.350
2014-01-01	5.400
2015-01-01	4.875
2016-01-01	3.825
2017-01-01	2.850