Year	Percent
1999-01-01	32.850
2000-01-01	31.825
2001-01-01	31.750
2002-01-01	32.425
2003-01-01	31.400
2004-01-01	32.775
2005-01-01	32.300
2006-01-01	31.900
2007-01-01	31.550
2008-01-01	30.750
2009-01-01	29.925
2010-01-01	29.775
2011-01-01	29.775
2012-01-01	27.900
2013-01-01	28.250
2014-01-01	28.075
2015-01-01	27.125
2016-01-01	26.150
2017-01-01	25.450