Year	Percent
1999-01-01	7.700
2000-01-01	7.100
2001-01-01	6.825
2002-01-01	6.825
2003-01-01	7.125
2004-01-01	6.850
2005-01-01	7.075
2006-01-01	7.200
2007-01-01	5.900
2008-01-01	4.850
2009-01-01	5.850
2010-01-01	7.050
2011-01-01	8.225
2012-01-01	9.425
2013-01-01	10.975
2014-01-01	10.625
2015-01-01	10.050
2016-01-01	8.600
2017-01-01	7.475