Year	Percent
2000-01-01	17.600
2001-01-01	18.050
2002-01-01	18.525
2003-01-01	18.600
2004-01-01	18.125
2005-01-01	17.425
2006-01-01	18.275
2007-01-01	18.300
2008-01-01	17.525
2009-01-01	16.625
2010-01-01	15.850
2011-01-01	15.775
2012-01-01	15.375
2013-01-01	15.375
2014-01-01	14.900
2015-01-01	14.875
2016-01-01	15.075
2017-01-01	15.075