Year	Percent
2000-01-01	16.575
2001-01-01	16.700
2002-01-01	16.775
2003-01-01	17.800
2004-01-01	17.600
2005-01-01	17.100
2006-01-01	16.725
2007-01-01	16.100
2008-01-01	14.500
2009-01-01	14.775
2010-01-01	15.675
2011-01-01	15.725
2012-01-01	16.025
2013-01-01	16.025
2014-01-01	15.875
2015-01-01	16.125
2016-01-01	16.225
2017-01-01	16.675