Year	Percent
1999-01-01	5.900
2000-01-01	6.575
2001-01-01	4.375
2002-01-01	3.550
2003-01-01	3.850
2004-01-01	3.850
2005-01-01	4.950
2007-01-01	3.000
2008-01-01	3.625
2009-01-01	3.800
2010-01-01	4.150
2011-01-01	7.450
2012-01-01	6.650
2013-01-01	7.400
2014-01-01	8.550
2015-01-01	8.150
2016-01-01	7.450
2017-01-01	7.250