Year	Percent
2000-01-01	24.875
2001-01-01	24.200
2002-01-01	23.450
2003-01-01	23.525
2004-01-01	23.400
2005-01-01	23.100
2006-01-01	22.625
2007-01-01	21.525
2008-01-01	20.650
2009-01-01	20.300
2010-01-01	21.825
2011-01-01	21.925
2012-01-01	20.975
2013-01-01	20.625
2014-01-01	20.975
2015-01-01	20.375
2016-01-01	20.325
2017-01-01	20.250