Year	Percent
1999-01-01	4.775
2000-01-01	4.075
2001-01-01	4.225
2002-01-01	4.325
2003-01-01	4.925
2004-01-01	5.150
2005-01-01	4.525
2006-01-01	3.400
2007-01-01	3.500
2008-01-01	3.200
2009-01-01	6.750
2010-01-01	8.525
2011-01-01	7.850
2012-01-01	7.700
2013-01-01	6.925
2014-01-01	6.575
2015-01-01	6.100
2016-01-01	5.950
2017-01-01	5.750