Year	Percent
1999-01-01	59.250
2000-01-01	55.425
2001-01-01	54.500
2002-01-01	55.050
2003-01-01	55.000
2004-01-01	56.700
2005-01-01	58.000
2006-01-01	57.950
2007-01-01	59.425
2008-01-01	59.525
2009-01-01	59.500
2010-01-01	58.275
2011-01-01	59.200
2012-01-01	59.250
2013-01-01	58.775
2014-01-01	58.025
2015-01-01	57.450
2016-01-01	57.475
2017-01-01	56.075