Year	Percent
1999-01-01	52.050
2000-01-01	53.100
2001-01-01	52.600
2002-01-01	52.600
2003-01-01	52.425
2004-01-01	53.125
2005-01-01	53.900
2006-01-01	54.000
2007-01-01	55.125
2008-01-01	55.550
2009-01-01	54.900
2010-01-01	55.275
2011-01-01	55.150
2012-01-01	54.975
2013-01-01	54.775
2014-01-01	54.775
2015-01-01	54.575
2016-01-01	54.750
2017-01-01	55.400