Year	Percent
1999-01-01	68.525
2000-01-01	68.300
2001-01-01	68.550
2002-01-01	68.100
2003-01-01	67.925
2004-01-01	67.975
2005-01-01	67.925
2006-01-01	68.725
2007-01-01	68.525
2008-01-01	68.950
2009-01-01	65.550
2010-01-01	63.300
2011-01-01	63.150
2012-01-01	62.325
2013-01-01	61.775
2014-01-01	62.175
2015-01-01	62.800
2016-01-01	63.875
2017-01-01	62.700