Year	Percent
1999-01-01	3.450
2000-01-01	3.150
2001-01-01	3.175
2002-01-01	3.450
2003-01-01	3.725
2004-01-01	4.750
2005-01-01	4.850
2006-01-01	4.600
2007-01-01	4.250
2008-01-01	3.600
2009-01-01	4.750
2010-01-01	4.350
2011-01-01	3.975
2012-01-01	4.350
2013-01-01	4.875
2014-01-01	5.175
2015-01-01	5.175
2016-01-01	5.425
2017-01-01	5.125