Year	Percent
2003-01-01	31.150
2004-01-01	30.600
2005-01-01	30.375
2006-01-01	29.975
2007-01-01	31.175
2008-01-01	31.425
2009-01-01	30.475
2010-01-01	30.125
2011-01-01	29.600
2012-01-01	28.550
2013-01-01	28.375
2014-01-01	27.625
2015-01-01	27.900
2016-01-01	27.850
2017-01-01	28.675