Year	Percent
1999-01-01	64.650
2000-01-01	62.500
2001-01-01	63.675
2002-01-01	62.550
2003-01-01	61.125
2004-01-01	59.650
2005-01-01	56.600
2006-01-01	57.300
2007-01-01	55.525
2008-01-01	55.550
2009-01-01	54.850
2010-01-01	52.425
2011-01-01	52.175
2012-01-01	52.100
2013-01-01	49.500
2014-01-01	48.725
2015-01-01	47.825
2016-01-01	46.400
2017-01-01	43.125