Quarter	Percent, Seasonally Adjusted
1998-01-01	51.4793491808628
1998-04-01	52.1706265811710
1998-07-01	52.9917904688583
1998-10-01	52.4439355932267
1999-01-01	53.0255897965134
1999-04-01	52.7906510640467
1999-07-01	53.2774071350007
1999-10-01	53.0103150576560
2000-01-01	53.1211489129892
2000-04-01	54.2620490255444
2000-07-01	53.7287997438737
2000-10-01	53.5873931269953
2001-01-01	53.0505120685408
2001-04-01	52.6175101916422
2001-07-01	52.2469082184538
2001-10-01	52.6575113476881
2002-01-01	52.5659332768589
2002-04-01	52.1320510445812
2002-07-01	52.4907691947215
2002-10-01	51.9727301978452
2003-01-01	53.3076919195393
2003-04-01	54.3860089585920
2003-07-01	55.4029648743320
2003-10-01	56.1145138973532
2004-01-01	56.5950412105439
2004-04-01	56.6314808301796
2004-07-01	56.5135365903276
2004-10-01	57.4632691248299
2005-01-01	57.7998163958322
2005-04-01	57.5051853747303
2005-07-01	57.8685168792972
2005-10-01	58.3604500966530
2006-01-01	58.4826120111325
2006-04-01	58.0149202810876
2006-07-01	58.2971904624673
2006-10-01	58.5907737216861
2007-01-01	58.4052307725062
2007-04-01	58.8802482182668
2007-07-01	58.7376198078261
2007-10-01	58.6612914792182
2008-01-01	58.7557838874539
2008-04-01	58.8225814738884
2008-07-01	59.3927306486769
2008-10-01	59.4638496446751
2009-01-01	60.1882761223153
2009-04-01	60.8945085343580
2009-07-01	61.9894127041166
2009-10-01	62.1552843029075
2010-01-01	62.9726956137732
2010-04-01	63.5245326892156
2010-07-01	64.6655343271648
2010-10-01	64.3743414963824
2011-01-01	62.0661850400460
2011-04-01	62.4767466297414
2011-07-01	61.0628621521919
2011-10-01	61.7899384649466
2012-01-01	63.1743400859790
2012-04-01	62.3948473293701
2012-07-01	62.0698019583028
2012-10-01	64.0534485424942
2013-01-01	64.9316445205454
2013-04-01	64.7390862852279
2013-07-01	64.6880073076942
2013-10-01	65.6494656017890
2014-01-01	65.5506130025036
2014-04-01	65.7014239862324
2014-07-01	64.9130672513833
2014-10-01	66.6237465316920
2015-01-01	66.3212621041440
2015-04-01	66.9263474230882
2015-07-01	66.3090666272370
2015-10-01	66.3383635366892
2016-01-01	66.7001100560490
2016-04-01	66.6127028742989
2016-07-01	67.3127955959260
2016-10-01	66.7099311713771
2017-01-01	66.4206053073375
2017-04-01	66.3763399537580
2017-07-01	65.7118218127692
2017-10-01	65.5473840442069
2018-01-01	66.5046798370030
2018-04-01	66.2152691142899