Year	Percent
1999-01-01	3.675
2000-01-01	3.325
2001-01-01	3.450
2002-01-01	4.025
2003-01-01	4.350
2004-01-01	5.175
2005-01-01	5.450
2006-01-01	4.950
2007-01-01	4.525
2008-01-01	3.925
2009-01-01	5.500
2010-01-01	5.000
2011-01-01	4.575
2012-01-01	4.950
2013-01-01	5.375
2014-01-01	5.850
2015-01-01	6.125
2016-01-01	6.450
2017-01-01	5.925