Year	Percent
1998-01-01	5.800
1999-01-01	4.900
2000-01-01	3.750
2001-01-01	2.825
2002-01-01	3.150
2003-01-01	3.875
2004-01-01	4.850
2005-01-01	5.075
2006-01-01	4.375
2007-01-01	3.650
2008-01-01	3.025
2009-01-01	3.450
2010-01-01	4.525
2011-01-01	5.450
2012-01-01	6.250
2013-01-01	7.300
2014-01-01	7.750
2015-01-01	7.250
2016-01-01	6.525
2017-01-01	5.275