Quarter	Percent, Seasonally Adjusted
1999-01-01	63.4130304448385
1999-04-01	63.6631944118627
1999-07-01	64.1002903239819
1999-10-01	64.5744995670134
2000-01-01	64.8876627300363
2000-04-01	65.2343736814731
2000-07-01	65.5970067331126
2000-10-01	65.8924887634893
2001-01-01	64.2355202215081
2001-04-01	64.4210497634281
2001-07-01	64.8347881028235
2001-10-01	65.1999401648539
2002-01-01	65.9660806680068
2002-04-01	66.4708256216093
2002-07-01	66.8561644710665
2002-10-01	67.0872388314102
2003-01-01	67.4794588920349
2003-04-01	67.7887769069217
2003-07-01	68.2586287680632
2003-10-01	68.5233557385356
2004-01-01	68.5462194581299
2004-04-01	68.7103761679052
2004-07-01	69.0508335802314
2004-10-01	69.3658652425698
2005-01-01	69.5519479388214
2005-04-01	70.0263644780214
2005-07-01	70.0644437045240
2005-10-01	70.4141375502592
2006-01-01	70.7955699609066
2006-04-01	70.9916301993521
2006-07-01	71.1089093492784
2006-10-01	71.4055263140431
2007-01-01	71.4517525403273
2007-04-01	71.6682327660721
2007-07-01	71.8957145665820
2007-10-01	71.9898606784516
2008-01-01	72.3041763001596
2008-04-01	72.6036152175082
2008-07-01	72.7745124995210
2008-10-01	73.1525061697238
2009-01-01	73.3145079432523
2009-04-01	73.0992281526426
2009-07-01	72.9047780657548
2009-10-01	73.0170105530037
2010-01-01	73.2966813340872
2010-04-01	73.5301016917958
2010-07-01	73.6055197321518
2010-10-01	73.6686426958762
2011-01-01	73.7149408415299
2011-04-01	73.9432605926486
2011-07-01	74.0282344334914
2011-10-01	73.9732898628809
2012-01-01	74.1563326181565
2012-04-01	74.2557590793708
2012-07-01	74.3830857945360
2012-10-01	74.2715772501399
2013-01-01	74.4311608152572
2013-04-01	74.1018995246990
2013-07-01	74.2890502971623
2013-10-01	74.2817840213794
2014-01-01	74.0807079016510
2014-04-01	74.1328198401630
2014-07-01	74.0743009827117
2014-10-01	74.4740370718850
2015-01-01	74.2462851748424
2015-04-01	74.4980238948671
2015-07-01	74.2077207263157
2015-10-01	74.2531546314438
2016-01-01	74.3264242406744
2016-04-01	74.2670544797797
2016-07-01	74.2250697418087
2016-10-01	73.9700835696316
2017-01-01	73.9688704002615
2017-04-01	73.7923524939210
2017-07-01	73.9177094195039
2017-10-01	73.8592044355844
2018-01-01	73.6696630616655
2018-04-01	73.7894538546914
2018-07-01	73.7159240041812