Quarter	Percent, Seasonally Adjusted
1998-01-01	63.9434469018002
1998-04-01	62.6854082352539
1998-07-01	64.5282939732984
1998-10-01	65.0084342690679
1999-01-01	65.7183113153288
1999-04-01	66.6895926284377
1999-07-01	66.3212781175148
1999-10-01	66.3841593450621
2000-01-01	66.3409437693859
2000-04-01	67.3223234264390
2000-07-01	67.5454631437811
2000-10-01	67.4553048655805
2001-01-01	67.7143729619660
2001-04-01	68.2621749225019
2001-07-01	68.0760864338371
2001-10-01	68.4193534534989
2002-01-01	68.0597027759588
2002-04-01	68.1865764144698
2002-07-01	68.0745077021055
2002-10-01	67.9894764233792
2003-01-01	67.9803160871197
2003-04-01	67.7976705691239
2003-07-01	67.6699407581092
2003-10-01	67.3537182339874
2004-01-01	67.4335163874462
2004-04-01	67.3669699352464
2004-07-01	67.8637854679467
2004-10-01	67.8877357776923
2005-01-01	68.2537099863704
2005-04-01	68.2418184139260
2005-07-01	68.3115290019473
2005-10-01	68.8192415846884
2006-01-01	69.1565995858290
2006-04-01	68.9123790129197
2006-07-01	69.5746859595426
2006-10-01	69.7525690497615
2007-01-01	69.8078018535294
2007-04-01	70.2280081479092
2007-07-01	70.5421528437181
2007-10-01	70.6619456095025
2008-01-01	70.9758735743680
2008-04-01	71.2476222525986
2008-07-01	71.0466808388888
2008-10-01	71.0091669690619
2009-01-01	69.9589687347256
2009-04-01	68.7870739825926
2009-07-01	68.0913280712258
2009-10-01	67.9802198393450
2010-01-01	68.0047411177254
2010-04-01	68.0915251362755
2010-07-01	68.1165587648260
2010-10-01	68.3828157526854
2011-01-01	68.6169436207735
2011-04-01	68.9458475219201
2011-07-01	69.1228147648254
2011-10-01	69.4142716528041
2012-01-01	69.3754296555360
2012-04-01	69.2737312913868
2012-07-01	69.5341237604762
2012-10-01	69.2666557642574
2013-01-01	68.9000960656967
2013-04-01	69.1606424156354
2013-07-01	68.7908530041438
2013-10-01	68.6955656817778
2014-01-01	68.7062987696738
2014-04-01	68.9768961091520
2014-07-01	68.6617304147580
2014-10-01	68.5519755389358
2015-01-01	68.6070241999963
2015-04-01	68.3648209258720
2015-07-01	68.6805828588415
2015-10-01	68.4834798072253
2016-01-01	68.9156341115943
2016-04-01	68.9333518738467
2016-07-01	69.3108894489767
2016-10-01	69.1468230884803
2017-01-01	69.3638720154373
2017-04-01	69.5966410090696
2017-07-01	69.8442462250973
2017-10-01	71.0460092013167
2018-01-01	71.3617821681151
2018-04-01	72.0498666974760