Year	Percent
2001-01-01	32.850
2002-01-01	32.725
2003-01-01	32.875
2004-01-01	33.100
2005-01-01	32.575
2006-01-01	32.100
2007-01-01	31.650
2008-01-01	31.675
2009-01-01	32.325
2010-01-01	32.900
2011-01-01	32.150
2012-01-01	31.725
2013-01-01	31.350
2014-01-01	30.900
2015-01-01	30.500
2016-01-01	30.350
2017-01-01	29.775