Year	Percent
1999-01-01	62.450
2000-01-01	63.050
2001-01-01	62.950
2002-01-01	62.950
2003-01-01	63.450
2004-01-01	63.150
2005-01-01	63.150
2006-01-01	63.925
2007-01-01	63.700
2008-01-01	62.725
2009-01-01	60.725
2010-01-01	59.875
2011-01-01	60.725
2012-01-01	61.650
2013-01-01	63.700
2014-01-01	67.825
2015-01-01	70.275
2016-01-01	72.975
2017-01-01	75.225