Year	Percent
2001-01-01	20.075
2002-01-01	20.625
2003-01-01	20.850
2004-01-01	20.850
2005-01-01	19.475
2006-01-01	18.850
2007-01-01	18.600
2008-01-01	18.325
2009-01-01	18.625
2010-01-01	18.100
2011-01-01	17.575
2012-01-01	17.400
2013-01-01	16.650
2014-01-01	16.375
2015-01-01	16.475
2016-01-01	16.100
2017-01-01	15.700