Quarter	Percent, Seasonally Adjusted
1998-01-01	55.3756536763886
1998-04-01	56.0219731329580
1998-07-01	56.3170733543341
1998-10-01	55.7520812805462
1999-01-01	56.5355462929933
1999-04-01	56.9823443882312
1999-07-01	57.3500577665580
1999-10-01	58.4076299964705
2000-01-01	58.4285374034335
2000-04-01	58.9965087286065
2000-07-01	59.2471480809182
2000-10-01	58.9630700109199
2001-01-01	58.1969779402798
2001-04-01	57.5382244089583
2001-07-01	57.7751641863393
2001-10-01	57.8128795974193
2002-01-01	58.0695559093956
2002-04-01	57.4677116436253
2002-07-01	58.2557625379091
2002-10-01	56.4385703935931
2003-01-01	57.3019873501812
2003-04-01	57.7254913946832
2003-07-01	59.3862898058555
2003-10-01	59.9975326788913
2004-01-01	60.6603925905594
2004-04-01	61.0780594521296
2004-07-01	60.8045654093498
2004-10-01	61.5573140293263
2005-01-01	61.7875161312746
2005-04-01	61.9287297505820
2005-07-01	61.4760841152343
2005-10-01	62.4068430483111
2006-01-01	62.6946503055266
2006-04-01	62.6075496134508
2006-07-01	61.9180643082913
2006-10-01	62.1906432089662
2007-01-01	62.1687810145582
2007-04-01	62.1384094931881
2007-07-01	62.6582226474430
2007-10-01	61.6973723687523
2008-01-01	62.6387688573001
2008-04-01	62.0281329171727
2008-07-01	61.2144327823160
2008-10-01	61.7996723917234
2009-01-01	61.6373622811969
2009-04-01	62.7146193388689
2009-07-01	63.1127145666597
2009-10-01	63.6485071877200
2010-01-01	64.6701604681981
2010-04-01	65.4067079135673
2010-07-01	66.6782391011236
2010-10-01	66.3808496239159
2011-01-01	64.2844047733048
2011-04-01	64.6692688798666
2011-07-01	63.4689661122200
2011-10-01	64.1101019449938
2012-01-01	65.3979347760144
2012-04-01	64.4630235338100
2012-07-01	64.7033073487581
2012-10-01	65.7898858664881
2013-01-01	66.5222390994174
2013-04-01	65.8849837261702
2013-07-01	66.3956963639756
2013-10-01	66.2083053417328
2014-01-01	66.0570912309817
2014-04-01	65.8954121946666
2014-07-01	65.7384782652954
2014-10-01	66.9197974035952
2015-01-01	66.4336461077281
2015-04-01	67.4390669615176
2015-07-01	66.7715431767818
2015-10-01	68.0870239608753
2016-01-01	67.6830705645070
2016-04-01	68.6527011355757
2016-07-01	69.7155398150127
2016-10-01	68.9704222897265
2017-01-01	68.6775071967421
2017-04-01	68.0112678749142
2017-07-01	66.8393810415570
2017-10-01	67.0868260059422
2018-01-01	69.3958324232316
2018-04-01	68.3497394334472