Quarter	Percent, Seasonally Adjusted
1998-04-01	66.6000000000000
1999-04-01	66.4000000000000
2000-04-01	65.1000000000000
2001-04-01	68.2000000000000
2002-04-01	65.9000000000000
2003-04-01	67.4000000000000
2004-04-01	67.4000000000000
2005-04-01	67.6000000000000
2006-04-01	67.8000000000000
2007-04-01	69.3000000000000
2008-04-01	70.2000000000000
2009-04-01	70.2000000000000
2010-01-01	68.6207921347624
2010-04-01	68.7682018860694
2010-07-01	68.1930800837526
2010-10-01	68.8511514152594
2011-01-01	69.6935317165785
2011-04-01	69.9602292799724
2011-07-01	69.6138099083241
2011-10-01	70.3193480015947
2012-01-01	70.2182675001020
2012-04-01	70.6623442791530
2012-07-01	70.8487504072096
2012-10-01	70.6371616205797
2013-01-01	71.4629095188941
2013-04-01	72.1393901865501
2013-07-01	71.4005887659304
2013-10-01	71.4158172238414
2014-01-01	70.9329196991608
2014-04-01	72.0096096691861
2014-07-01	71.3683743472818
2014-10-01	72.1440650994189
2015-01-01	72.9687963171427
2015-04-01	72.8578200891864
2015-07-01	73.1419121679290
2015-10-01	73.9297581009779
2016-01-01	73.6031043432512
2016-04-01	74.6606832224268
2016-07-01	74.3842478158743
2016-10-01	74.6090849619210
2017-01-01	74.0599780021600
2017-04-01	75.0847148444824
2017-07-01	74.9372378101450
2017-10-01	76.1169764333934
2018-01-01	75.6767384416049
2018-04-01	76.4551116694901