Quarter	Percent, Seasonally Adjusted
1998-01-01	61.6490962369835
1998-04-01	61.2754425293400
1998-07-01	61.0642627455800
1998-10-01	60.7401967280920
1999-01-01	61.2122528598977
1999-04-01	61.5228460457051
1999-07-01	61.7430492132071
1999-10-01	62.1586567770530
2000-01-01	61.6986644103599
2000-04-01	61.5278228787864
2000-07-01	61.5133640306496
2000-10-01	61.7339393116114
2001-01-01	62.7599718114761
2001-04-01	63.3780274977174
2001-07-01	63.5367803116348
2001-10-01	63.8755918525886
2002-01-01	64.2565960756237
2002-04-01	64.4245792908819
2002-07-01	64.3799051102474
2002-10-01	65.0244943505524
2003-01-01	64.9617543325292
2003-04-01	65.1957245593860
2003-07-01	65.0721863012925
2003-10-01	66.4915981654373
2004-01-01	63.2355847185478
2004-04-01	63.0995136483452
2004-07-01	63.9690331214390
2004-10-01	64.8303566665460
2005-01-01	65.2882921984718
2005-04-01	65.9784179990153
2005-07-01	66.6617139635184
2005-10-01	66.6929557016548
2006-01-01	66.2921566464261
2006-04-01	67.5899626593843
2006-07-01	68.3659299120046
2006-10-01	68.3667893615040
2007-01-01	69.5893839716051
2007-04-01	69.1911696387392
2007-07-01	68.6866809362069
2007-10-01	69.2416612042796
2008-01-01	69.1615481511903
2008-04-01	68.4037045097120
2008-07-01	69.1775006049610
2008-10-01	70.2744898864886
2009-01-01	70.6030371702529
2009-04-01	71.4229456465829
2009-07-01	71.0688025867832
2009-10-01	71.5230782189271
2010-01-01	71.2542128494292
2010-04-01	71.5027213619912
2010-07-01	72.8149311780259
2010-10-01	72.0909266507731
2011-01-01	72.5348463537476
2011-04-01	73.5819639687291
2011-07-01	73.2788762521342
2011-10-01	72.1631043209524
2012-01-01	71.2493997871660
2012-04-01	71.1748747700510
2012-07-01	71.4837080303672
2012-10-01	71.8681762635414
2013-01-01	72.3905409540850
2013-04-01	72.9001600304478
2013-07-01	73.1190896856874
2013-10-01	73.0281202246259
2014-01-01	72.7481033275420
2014-04-01	72.8018540802784
2014-07-01	72.5958362281877
2014-10-01	73.2847111186162
2015-01-01	73.7135748131972
2015-04-01	73.9686122823929
2015-07-01	73.9438218705741
2015-10-01	73.6295299745464
2016-01-01	73.8791726507863
2016-04-01	73.0679937601427
2016-07-01	73.4655092918794
2016-10-01	73.1592442078953
2017-01-01	73.7831251112903
2017-04-01	74.0649085461576
2017-07-01	73.4831366315254
2017-10-01	73.9604331439422
2018-01-01	73.7328543732465
2018-04-01	73.6925905515497