Year	Percent
2000-01-01	20.100
2001-01-01	20.100
2002-01-01	20.775
2003-01-01	20.700
2004-01-01	20.075
2005-01-01	19.350
2006-01-01	18.325
2007-01-01	15.250
2008-01-01	16.450
2009-01-01	19.350
2010-01-01	21.300
2011-01-01	22.000
2012-01-01	22.175
2013-01-01	21.650
2014-01-01	21.425
2015-01-01	21.025
2016-01-01	20.800
2017-01-01	21.250