Year	Percent
1999-01-01	34.525
2000-01-01	33.225
2001-01-01	31.675
2002-01-01	32.900
2003-01-01	29.575
2004-01-01	28.750
2005-01-01	31.225
2006-01-01	30.425
2007-01-01	33.075
2008-01-01	33.150
2009-01-01	31.925
2010-01-01	32.200
2011-01-01	31.650
2012-01-01	30.125
2013-01-01	29.825
2014-01-01	27.400
2015-01-01	27.250
2016-01-01	25.075
2017-01-01	24.350