Year	Percent
2001-01-01	33.125
2002-01-01	31.800
2003-01-01	31.100
2004-01-01	30.275
2005-01-01	30.975
2006-01-01	30.425
2007-01-01	30.575
2008-01-01	30.950
2009-01-01	30.050
2010-01-01	29.750
2011-01-01	27.900
2012-01-01	26.975
2013-01-01	26.650
2014-01-01	25.100
2015-01-01	24.475
2016-01-01	23.150
2017-01-01	22.175