Year	Percent
2001-01-01	30.025
2002-01-01	28.750
2003-01-01	28.075
2004-01-01	27.300
2005-01-01	27.275
2006-01-01	27.150
2007-01-01	27.150
2008-01-01	27.225
2009-01-01	26.125
2010-01-01	25.250
2011-01-01	24.025
2012-01-01	23.025
2013-01-01	22.475
2014-01-01	21.800
2015-01-01	21.350
2016-01-01	20.300
2017-01-01	19.500