Year	Percent
1998-01-01	60.450
1999-01-01	59.700
2000-01-01	59.700
2001-01-01	60.525
2002-01-01	59.875
2003-01-01	59.200
2004-01-01	57.975
2005-01-01	57.850
2006-01-01	57.575
2007-01-01	57.650
2008-01-01	57.575
2009-01-01	56.500
2010-01-01	55.925
2011-01-01	56.225
2012-01-01	56.025
2013-01-01	56.250
2014-01-01	55.925
2015-01-01	55.250
2016-01-01	55.000
2017-01-01	55.250