Year	Percent
2001-01-01	26.950
2002-01-01	25.775
2003-01-01	25.075
2004-01-01	24.400
2005-01-01	23.625
2006-01-01	23.975
2007-01-01	23.775
2008-01-01	23.500
2009-01-01	22.225
2010-01-01	20.700
2011-01-01	20.150
2012-01-01	19.100
2013-01-01	18.325
2014-01-01	18.475
2015-01-01	18.225
2016-01-01	17.475
2017-01-01	16.800