Year	Percent
1999-01-01	7.625
2000-01-01	7.075
2001-01-01	6.375
2002-01-01	6.200
2003-01-01	6.150
2004-01-01	6.100
2005-01-01	7.025
2006-01-01	7.200
2007-01-01	7.175
2008-01-01	7.725
2009-01-01	10.350
2010-01-01	11.725
2011-01-01	11.175
2012-01-01	11.425
2013-01-01	10.300
2014-01-01	7.600
2015-01-01	6.675
2016-01-01	5.150
2017-01-01	3.825