Year	Percent
1998-01-01	10.000
1999-01-01	9.000
2000-01-01	8.900
2001-01-01	8.050
2002-01-01	7.250
2003-01-01	6.950
2004-01-01	7.550
2005-01-01	7.200
2006-01-01	6.600
2007-01-01	5.800
2008-01-01	5.425
2009-01-01	6.125
2010-01-01	6.225
2011-01-01	5.600
2012-01-01	5.625
2013-01-01	6.275
2014-01-01	6.575
2015-01-01	7.525
2016-01-01	7.325
2017-01-01	6.900