Year	Percent
1999-01-01	4.775
2000-01-01	5.350
2001-01-01	3.900
2002-01-01	2.975
2003-01-01	3.250
2004-01-01	3.100
2005-01-01	4.200
2006-01-01	2.525
2007-01-01	3.275
2008-01-01	4.000
2009-01-01	3.625
2010-01-01	3.950
2011-01-01	6.225
2012-01-01	6.175
2013-01-01	7.000
2014-01-01	7.800
2015-01-01	7.750
2016-01-01	6.450
2017-01-01	6.425