Year	Percent
1999-01-01	11.750
2000-01-01	12.150
2001-01-01	12.125
2002-01-01	12.275
2003-01-01	12.225
2004-01-01	11.775
2005-01-01	11.875
2006-01-01	11.125
2007-01-01	11.125
2008-01-01	10.175
2009-01-01	10.675
2010-01-01	11.325
2011-01-01	11.825
2012-01-01	12.225
2013-01-01	12.500
2014-01-01	12.900
2015-01-01	12.850
2016-01-01	12.650
2017-01-01	13.850