Year	Percent
1999-01-01	6.450
2000-01-01	5.825
2001-01-01	5.425
2002-01-01	5.800
2003-01-01	6.025
2004-01-01	5.750
2005-01-01	6.175
2006-01-01	6.600
2007-01-01	5.575
2008-01-01	4.200
2009-01-01	5.375
2010-01-01	6.800
2011-01-01	7.950
2012-01-01	9.025
2013-01-01	10.550
2014-01-01	10.425
2015-01-01	10.175
2016-01-01	8.675
2017-01-01	7.450