Year	Percent
1999-01-01	31.225
2000-01-01	32.750
2001-01-01	33.175
2002-01-01	32.175
2003-01-01	29.900
2004-01-01	30.075
2005-01-01	29.725
2006-01-01	30.375
2007-01-01	29.925
2008-01-01	29.750
2009-01-01	27.375
2010-01-01	27.300
2011-01-01	27.725
2012-01-01	27.800
2013-01-01	25.350
2014-01-01	24.525
2015-01-01	25.000
2016-01-01	24.025
2017-01-01	24.450