Quarter	Percent, Seasonally Adjusted
1999-01-01	57.3995892041376
1999-04-01	57.8804581546959
1999-07-01	58.2706354018910
1999-10-01	58.5358142351762
2000-01-01	58.9726886571069
2000-04-01	59.3010460206650
2000-07-01	59.7094474868834
2000-10-01	60.0415446054696
2001-01-01	60.2013690632848
2001-04-01	60.4767230931772
2001-07-01	60.6124658820875
2001-10-01	60.7658395489111
2002-01-01	60.6612718200312
2002-04-01	60.7810226070402
2002-07-01	60.6340754595180
2002-10-01	60.7006536551797
2003-01-01	61.0378079498764
2003-04-01	61.2088948950196
2003-07-01	61.3243006723936
2003-10-01	61.5177421080704
2004-01-01	61.5248803985736
2004-04-01	61.5533712287620
2004-07-01	61.7023703674268
2004-10-01	62.2672456665082
2005-01-01	62.7948570245689
2005-04-01	63.0285355005671
2005-07-01	63.4728992507328
2005-10-01	63.6894961288410
2006-01-01	63.8640623359730
2006-04-01	63.9424115059453
2006-07-01	64.1054920628538
2006-10-01	64.1869710483940
2007-01-01	64.2629559372446
2007-04-01	64.3411074108468
2007-07-01	64.0942548994909
2007-10-01	63.8567278310868
2008-01-01	63.5889478194694
2008-04-01	62.5533232643778
2008-07-01	61.3722625673942
2008-10-01	59.6218921151803
2009-01-01	57.2468733489100
2009-04-01	56.0517728938465
2009-07-01	55.2005818336348
2009-10-01	54.9215907331860
2010-01-01	54.4147426034955
2010-04-01	54.3536351787581
2010-07-01	54.0964095383224
2010-10-01	53.7843218803924
2011-01-01	53.5430910489176
2011-04-01	53.1072240488855
2011-07-01	52.5146355819305
2011-10-01	51.8694413321633
2012-01-01	50.9166910557604
2012-04-01	50.2175328531010
2012-07-01	49.7220924580865
2012-10-01	49.2332017820616
2013-01-01	48.8453469513254
2013-04-01	48.7642920017069
2013-07-01	48.7209432897136
2013-10-01	48.9642292070143
2014-01-01	48.8906565700726
2014-04-01	49.5669267363296
2014-07-01	50.0090098764358
2014-10-01	50.2964436337967
2015-01-01	50.6417308579587
2015-04-01	51.2518394346440
2015-07-01	51.5431854346142
2015-10-01	51.9960286286551
2016-01-01	52.4541968278385
2016-04-01	52.3885006795800
2016-07-01	52.6554827657263
2016-10-01	53.0179726923927
2017-01-01	53.4024470867948
2017-04-01	53.7507611185325
2017-07-01	54.1307876151262
2017-10-01	54.2720524281968
2018-01-01	54.4698526716468
2018-04-01	54.9072818555389
2018-07-01	55.0566629687466