Year	Percent
1999-01-01	24.575
2000-01-01	23.475
2001-01-01	22.850
2002-01-01	20.950
2003-01-01	20.050
2004-01-01	21.150
2005-01-01	20.600
2006-01-01	19.925
2007-01-01	19.500
2008-01-01	19.075
2009-01-01	17.950
2010-01-01	17.650
2011-01-01	16.775
2012-01-01	16.000
2013-01-01	15.475
2014-01-01	15.450
2015-01-01	15.625
2016-01-01	15.100
2017-01-01	14.950