Year	Percent
1999-01-01	64.300
2000-01-01	64.700
2001-01-01	64.250
2002-01-01	64.300
2003-01-01	65.025
2004-01-01	64.725
2005-01-01	64.950
2006-01-01	65.325
2007-01-01	66.175
2008-01-01	66.600
2009-01-01	67.550
2010-01-01	67.475
2011-01-01	68.000
2012-01-01	68.525
2013-01-01	69.000
2014-01-01	69.825
2015-01-01	70.025
2016-01-01	71.550
2017-01-01	71.900