Quarter	Percent, Seasonally Adjusted
1999-04-01	56.9401354080092
1999-07-01	57.1123814081433
1999-10-01	57.3547108120747
2000-01-01	57.3445857921534
2000-04-01	57.5300308477877
2000-07-01	57.9130426288700
2000-10-01	57.6678174526870
2001-01-01	57.8080053711286
2001-04-01	57.8461335133981
2001-07-01	57.8322781855072
2001-10-01	58.0050214525260
2002-01-01	58.0000893559558
2002-04-01	58.2271316714128
2002-07-01	58.2813381904131
2002-10-01	58.2036572674470
2003-01-01	58.2090471946576
2003-04-01	58.3172806751226
2003-07-01	58.2814017574813
2003-10-01	58.4524151020176
2004-01-01	58.6631371297407
2004-04-01	58.6434622528608
2004-07-01	58.5731245781091
2004-10-01	58.7112259383760
2005-01-01	58.9873945106695
2005-04-01	58.9077800186924
2005-07-01	59.1693298318358
2005-10-01	58.8547715920270
2006-01-01	59.1463696660696
2006-04-01	59.1552947877833
2006-07-01	59.0688597649075
2006-10-01	59.0381733289175
2007-01-01	58.6314660449073
2007-04-01	58.6963501752639
2007-07-01	58.8888102262152
2007-10-01	59.1534940789689
2008-01-01	59.1649718792505
2008-04-01	59.2722901428097
2008-07-01	59.0069210092438
2008-10-01	58.8640611513345
2009-01-01	58.6298121635980
2009-04-01	58.3084100163286
2009-07-01	58.3856887754402
2009-10-01	58.4288003180410
2010-01-01	58.1054773844487
2010-04-01	58.1146827232118
2010-07-01	58.1365405808757
2010-10-01	57.8977060689133
2011-01-01	58.1178234928182
2011-04-01	57.9626059147696
2011-07-01	57.8607883474958
2011-10-01	57.7860042714293
2012-01-01	57.7728393980346
2012-04-01	57.9649057764854
2012-07-01	58.2079706685242
2012-10-01	58.4811561171107
2013-01-01	58.5185495409857
2013-04-01	58.6251709857851
2013-07-01	58.7480956259283
2013-10-01	59.0239177279467
2014-01-01	59.3439541193604
2014-04-01	59.7129255472903
2014-07-01	59.9051540132838
2014-10-01	60.1559016345605
2015-01-01	60.2850473640141
2015-04-01	60.2711716091864
2015-07-01	60.4697671751020
2015-10-01	60.6515350838682
2016-01-01	60.6385667051733
2016-04-01	60.9733310595992
2016-07-01	61.1819839625431
2016-10-01	61.3763259046453
2017-01-01	61.5195028068257
2017-04-01	61.7196290249655
2017-07-01	61.7906725372509
2017-10-01	61.8414291336372
2018-01-01	62.0772510263667
2018-04-01	62.0534325069303