Year	Percent
2000-01-01	31.825
2001-01-01	31.450
2002-01-01	31.450
2003-01-01	31.175
2004-01-01	30.500
2005-01-01	29.225
2006-01-01	28.125
2007-01-01	24.400
2008-01-01	25.150
2009-01-01	27.000
2010-01-01	28.425
2011-01-01	28.825
2012-01-01	28.875
2013-01-01	28.175
2014-01-01	28.175
2015-01-01	27.950
2016-01-01	27.325
2017-01-01	27.350