Quarter	Percent, Seasonally Adjusted
1999-04-01	77.1728869573582
1999-07-01	77.3963985084729
1999-10-01	77.8587592782086
2000-01-01	78.1110340659286
2000-04-01	78.3317679028539
2000-07-01	78.3799869587320
2000-10-01	78.4942720712965
2001-01-01	78.5041404984788
2001-04-01	78.8142388950360
2001-07-01	79.1953645238790
2001-10-01	79.2315073381921
2002-01-01	79.2900916804882
2002-04-01	79.3602907492418
2002-07-01	78.7430330177934
2002-10-01	78.8511820533545
2003-01-01	79.0263581020256
2003-04-01	79.0088426061595
2003-07-01	79.0383937136712
2003-10-01	79.3839832934037
2004-01-01	79.6539424623209
2004-04-01	79.8115687195052
2004-07-01	79.8403637286723
2004-10-01	80.2867708109617
2005-01-01	80.5045167607938
2005-04-01	80.8464954100152
2005-07-01	81.1250433099669
2005-10-01	81.1931243227943
2006-01-01	81.2994915242661
2006-04-01	81.2577422309868
2006-07-01	81.4102382714776
2006-10-01	81.6674930613917
2007-01-01	82.1586214663282
2007-04-01	82.0509063937014
2007-07-01	82.1517859125944
2007-10-01	81.9974808929808
2008-01-01	82.1198523460448
2008-04-01	81.8030843319922
2008-07-01	81.9382928463633
2008-10-01	82.0408446382776
2009-01-01	81.1907785747160
2009-04-01	81.2623649516488
2009-07-01	81.4663689073713
2009-10-01	80.8331801680694
2010-01-01	80.7966220822090
2010-04-01	80.9043229915350
2010-07-01	80.6879386730039
2010-10-01	80.3174451331161
2011-01-01	80.1101527008349
2011-04-01	80.5085669466546
2011-07-01	80.5708865978635
2011-10-01	80.5796853840359
2012-01-01	80.8946215307076
2012-04-01	80.4876144747879
2012-07-01	80.7858976781506
2012-10-01	80.5973354709641
2013-01-01	80.8970428934040
2013-04-01	81.4984564958121
2013-07-01	81.4488849537286
2013-10-01	81.4649869004580
2014-01-01	81.7399533864218
2014-04-01	81.5803467367636
2014-07-01	81.8027904759726
2014-10-01	81.7274864496017
2015-01-01	81.6149097813664
2015-04-01	82.0504545425323
2015-07-01	81.8214567073962
2015-10-01	82.0675981425669
2016-01-01	81.7842133962469
2016-04-01	81.8295761983620
2016-07-01	82.0130600533217
2016-10-01	81.8717398372041
2017-01-01	82.3532226696032
2017-04-01	81.8727685502343
2017-07-01	83.5174380727562
2017-10-01	83.4285017169354
2018-01-01	83.2188812740716
2018-04-01	83.1072077827286