Year	Percent
1998-01-01	3.800
1999-01-01	4.775
2000-01-01	5.150
2001-01-01	4.850
2002-01-01	4.025
2003-01-01	4.400
2004-01-01	5.375
2005-01-01	5.150
2006-01-01	5.300
2007-01-01	4.650
2008-01-01	3.875
2009-01-01	5.675
2010-01-01	6.500
2011-01-01	5.800
2012-01-01	5.825
2013-01-01	5.825
2014-01-01	4.925
2015-01-01	4.375
2016-01-01	3.850
2017-01-01	2.400