Year	Percent
1999-01-01	4.975
2000-01-01	5.150
2001-01-01	5.700
2002-01-01	6.175
2003-01-01	7.050
2004-01-01	10.500
2005-01-01	10.975
2006-01-01	9.800
2007-01-01	9.375
2008-01-01	8.475
2009-01-01	10.650
2010-01-01	9.475
2011-01-01	8.950
2012-01-01	9.400
2013-01-01	9.675
2014-01-01	10.275
2015-01-01	10.575
2016-01-01	11.200
2017-01-01	9.800