Quarter	Percent, Seasonally Adjusted
1998-01-01	57.0249121699934
1998-04-01	56.0208623461877
1998-07-01	57.5777124484678
1998-10-01	58.0252953340948
1999-01-01	58.7244049654281
1999-04-01	59.6991134534044
1999-07-01	59.3902829612037
1999-10-01	59.5005407588373
2000-01-01	59.3775025212382
2000-04-01	60.3079354841037
2000-07-01	60.5413918962758
2000-10-01	60.5133508916316
2001-01-01	60.6003514159285
2001-04-01	61.0245588697086
2001-07-01	60.8059668406053
2001-10-01	61.1428221587657
2002-01-01	60.9078998703412
2002-04-01	60.9695344039601
2002-07-01	60.8421516404082
2002-10-01	60.7744994345980
2003-01-01	60.8439463287686
2003-04-01	60.6762196603977
2003-07-01	60.4676402942714
2003-10-01	60.1783610133667
2004-01-01	60.2504798752403
2004-04-01	60.1721982518790
2004-07-01	60.6485434063093
2004-10-01	60.6264964355737
2005-01-01	60.9492028737018
2005-04-01	60.9630377487604
2005-07-01	61.0341211075413
2005-10-01	61.5570106098862
2006-01-01	61.8365139499729
2006-04-01	61.6607925034431
2006-07-01	62.1770818295870
2006-10-01	62.3740782776509
2007-01-01	62.3956208536642
2007-04-01	62.7880072015245
2007-07-01	63.1431463849427
2007-10-01	63.3177061654441
2008-01-01	63.5504939409216
2008-04-01	63.6912164543174
2008-07-01	63.4880422295556
2008-10-01	63.5491337481189
2009-01-01	62.5189200864161
2009-04-01	61.4281483459430
2009-07-01	60.7865014854216
2009-10-01	60.6715319080704
2010-01-01	60.7455104074946
2010-04-01	60.7874010875784
2010-07-01	60.8300235447988
2010-10-01	60.8605160096081
2011-01-01	60.9977824907687
2011-04-01	61.2992996256260
2011-07-01	61.2522125444396
2011-10-01	61.4768056718249
2012-01-01	61.3933817317518
2012-04-01	61.2660899563613
2012-07-01	61.3091534334747
2012-10-01	60.9801090910865
2013-01-01	60.5873000485160
2013-04-01	60.6482568836297
2013-07-01	60.2428435021862
2013-10-01	60.1390486177847
2014-01-01	60.0767008773520
2014-04-01	60.2035724822140
2014-07-01	59.9856046417333
2014-10-01	59.9061882558728
2015-01-01	59.9076268846054
2015-04-01	59.5358903716120
2015-07-01	59.7804999494828
2015-10-01	59.6037062217623
2016-01-01	59.7934910503228
2016-04-01	59.7206822414352
2016-07-01	59.9748375977436
2016-10-01	59.8823175174609
2017-01-01	60.0101024068733
2017-04-01	60.1100909297404
2017-07-01	60.1753181677227
2017-10-01	61.1846887460798
2018-01-01	61.3236994063349
2018-04-01	61.7999953539426