Year	Percent
1998-01-01	3.500
1999-01-01	4.625
2000-01-01	5.000
2001-01-01	4.400
2002-01-01	3.550
2003-01-01	4.025
2004-01-01	4.925
2005-01-01	4.500
2006-01-01	5.125
2007-01-01	4.550
2008-01-01	3.450
2009-01-01	5.575
2010-01-01	6.500
2011-01-01	5.850
2012-01-01	5.725
2013-01-01	5.400
2014-01-01	4.550
2015-01-01	4.000
2016-01-01	3.825
2017-01-01	2.025