Year	Percent
1999-01-01	3.675
2000-01-01	3.325
2001-01-01	3.475
2002-01-01	4.050
2003-01-01	4.375
2004-01-01	5.175
2005-01-01	5.475
2006-01-01	5.025
2007-01-01	4.550
2008-01-01	3.950
2009-01-01	5.575
2010-01-01	5.075
2011-01-01	4.625
2012-01-01	5.025
2013-01-01	5.450
2014-01-01	5.950
2015-01-01	6.225
2016-01-01	6.525
2017-01-01	6.000