Quarter	Percent, Seasonally Adjusted
1999-04-01	79.5671836940873
1999-07-01	79.8862429290359
1999-10-01	80.0770570225676
2000-01-01	79.9030401930288
2000-04-01	80.1795928893446
2000-07-01	80.4429569732900
2000-10-01	80.3434934204505
2001-01-01	80.4813925171361
2001-04-01	80.4941599670339
2001-07-01	80.2733287412036
2001-10-01	80.2994989350166
2002-01-01	80.1089119992951
2002-04-01	80.3697592393132
2002-07-01	80.5725159703834
2002-10-01	80.7048347623089
2003-01-01	80.5000190935849
2003-04-01	80.7089460387706
2003-07-01	80.5904069175994
2003-10-01	80.6246219815261
2004-01-01	80.8722465314298
2004-04-01	80.7382666715437
2004-07-01	80.7501185600590
2004-10-01	81.0256438994643
2005-01-01	81.2075364998217
2005-04-01	81.1436581773481
2005-07-01	81.3290929568352
2005-10-01	81.2032859025295
2006-01-01	81.3755963767390
2006-04-01	81.2071466888137
2006-07-01	81.0454750287608
2006-10-01	81.0243592010052
2007-01-01	80.9824326177775
2007-04-01	81.3227476734452
2007-07-01	81.3937074545411
2007-10-01	81.4666959673481
2008-01-01	81.5775248234194
2008-04-01	81.5637595719596
2008-07-01	81.1628391165437
2008-10-01	80.9515030825147
2009-01-01	80.6802334277624
2009-04-01	79.8353480697312
2009-07-01	79.8621599773099
2009-10-01	79.9190376938488
2010-01-01	79.4003669492903
2010-04-01	79.7583042792203
2010-07-01	79.9254506071950
2010-10-01	79.9487963065384
2011-01-01	80.1894704421246
2011-04-01	80.0256772059960
2011-07-01	79.9622793115758
2011-10-01	80.0544814302664
2012-01-01	80.1822107613984
2012-04-01	80.2832609829784
2012-07-01	80.5554174284204
2012-10-01	80.7795750404046
2013-01-01	80.5858865582706
2013-04-01	80.7606395531104
2013-07-01	80.8666587141787
2013-10-01	81.1423875575299
2014-01-01	81.7307235366290
2014-04-01	82.0201296981056
2014-07-01	82.2149645339255
2014-10-01	82.2713253028828
2015-01-01	82.3819162310009
2015-04-01	82.2435731671628
2015-07-01	82.2634135726140
2015-10-01	82.5741912234531
2016-01-01	82.6596136209246
2016-04-01	82.9640843316015
2016-07-01	83.0474696560637
2016-10-01	83.1179354502961
2017-01-01	83.2668731360706
2017-04-01	83.8214612233859
2017-07-01	83.9185102855301
2017-10-01	84.0927183595226
2018-01-01	84.2808576919141
2018-04-01	84.1922424349704