Year	Percent
2000-01-01	49.025
2001-01-01	47.950
2002-01-01	45.075
2003-01-01	44.800
2004-01-01	43.725
2005-01-01	41.100
2006-01-01	39.050
2007-01-01	37.850
2008-01-01	35.000
2009-01-01	33.475
2010-01-01	35.750
2011-01-01	34.900
2012-01-01	34.900
2013-01-01	33.350
2014-01-01	32.350
2015-01-01	31.300
2016-01-01	29.050
2017-01-01	27.800