Quarter	Percent, Seasonally Adjusted
1999-01-01	77.7377692738075
1999-04-01	77.7567565629173
1999-07-01	77.9661569492779
1999-10-01	78.1586711258174
2000-01-01	78.4555871371674
2000-04-01	78.6500162419194
2000-07-01	78.9254242253006
2000-10-01	79.2299011421149
2001-01-01	78.0458489003374
2001-04-01	78.3472262284740
2001-07-01	78.4959111046507
2001-10-01	78.7286826227541
2002-01-01	78.9606191344611
2002-04-01	79.1582493236942
2002-07-01	79.3493337396302
2002-10-01	79.5011813526736
2003-01-01	79.7688079065707
2003-04-01	79.9188479198976
2003-07-01	80.1754444857478
2003-10-01	80.3576699556683
2004-01-01	80.1811753597183
2004-04-01	80.1713503381305
2004-07-01	80.3113363334937
2004-10-01	80.4605760700408
2005-01-01	80.6772121956710
2005-04-01	80.9105306435411
2005-07-01	80.9619875909505
2005-10-01	81.1220712682893
2006-01-01	81.2731895617517
2006-04-01	81.1702823465011
2006-07-01	81.2834789655044
2006-10-01	81.2543483877821
2007-01-01	81.1962091484612
2007-04-01	81.4627580280874
2007-07-01	81.3899415687067
2007-10-01	81.3597932127310
2008-01-01	81.6324435571778
2008-04-01	81.6708753751247
2008-07-01	81.5964083755805
2008-10-01	81.4929476942614
2009-01-01	81.5245381174488
2009-04-01	81.0303651201729
2009-07-01	80.3357651647317
2009-10-01	80.5047825157229
2010-01-01	80.5997899842847
2010-04-01	80.8737046125482
2010-07-01	80.5681446469017
2010-10-01	80.4875504344384
2011-01-01	80.4539883304522
2011-04-01	80.3165784499316
2011-07-01	80.3854891345624
2011-10-01	80.3691441368060
2012-01-01	80.0606200443132
2012-04-01	80.2327152570662
2012-07-01	80.1103129487211
2012-10-01	79.9180698350814
2013-01-01	80.0262105826670
2013-04-01	79.5684098580767
2013-07-01	79.7718730474706
2013-10-01	79.6696743152913
2014-01-01	79.3195285410005
2014-04-01	79.5469413983217
2014-07-01	79.4844340804877
2014-10-01	79.7744897038290
2015-01-01	79.6137359805789
2015-04-01	79.6628498169661
2015-07-01	79.5090023078530
2015-10-01	79.3605452030660
2016-01-01	79.4774523649977
2016-04-01	79.2124487970129
2016-07-01	79.0679253319182
2016-10-01	79.0287116799711
2017-01-01	79.0168747741448
2017-04-01	78.8834396085808
2017-07-01	78.9643587388742
2017-10-01	78.8524535259783
2018-01-01	78.7450894039506
2018-04-01	78.8809403993188
2018-07-01	78.8304877706839