Year	Percent
1998-01-01	4.650
1999-01-01	4.825
2000-01-01	4.475
2001-01-01	4.350
2002-01-01	4.100
2003-01-01	3.800
2004-01-01	4.175
2005-01-01	3.500
2006-01-01	2.900
2007-01-01	2.400
2008-01-01	3.100
2009-01-01	3.400
2010-01-01	3.575
2011-01-01	3.850
2012-01-01	5.250
2013-01-01	5.750
2014-01-01	5.475
2015-01-01	5.525
2016-01-01	5.725
2017-01-01	5.800