Year	Percent
1999-01-01	13.875
2000-01-01	13.650
2001-01-01	12.250
2002-01-01	13.250
2003-01-01	13.725
2004-01-01	16.225
2005-01-01	19.625
2006-01-01	18.625
2007-01-01	17.400
2008-01-01	18.850
2009-01-01	27.825
2010-01-01	27.750
2011-01-01	26.975
2012-01-01	29.150
2013-01-01	25.650
2014-01-01	19.975
2015-01-01	18.325
2016-01-01	12.975
2017-01-01	9.725