Quarter	Percent, Seasonally Adjusted
1998-01-01	56.3946840830097
1998-04-01	56.2971562508586
1998-07-01	56.3844766986157
1998-10-01	56.3427059001798
1999-01-01	56.4013248915113
1999-04-01	56.5291858544818
1999-07-01	56.5145656001648
1999-10-01	56.5599092272096
2000-01-01	56.5173605973609
2000-04-01	56.7909735190531
2000-07-01	57.0315546721793
2000-10-01	57.3185450992204
2001-01-01	57.2355510836450
2001-04-01	57.1032336438082
2001-07-01	57.2505190197910
2001-10-01	57.3265347018586
2002-01-01	57.5743301104055
2002-04-01	57.5387505759394
2002-07-01	57.5575786204619
2002-10-01	57.7150518663609
2003-01-01	57.8240489137344
2003-04-01	57.8548806803504
2003-07-01	58.0015899814132
2003-10-01	58.1812850413957
2004-01-01	57.5823878691275
2004-04-01	57.8182343705610
2004-07-01	57.8276227491269
2004-10-01	57.5961927354804
2005-01-01	57.4053402138116
2005-04-01	57.2952940400515
2005-07-01	57.2274616312366
2005-10-01	57.3187212544246
2006-01-01	57.5875471111248
2006-04-01	57.7365600753207
2006-07-01	57.4819969910575
2006-10-01	57.3683981485307
2007-01-01	57.3569550905312
2007-04-01	57.4964798322088
2007-07-01	57.6058991828346
2007-10-01	57.5122288054666
2008-01-01	57.3087765965501
2008-04-01	57.2718537939188
2008-07-01	57.0753196823431
2008-10-01	56.6366132866156
2009-01-01	56.0771024486878
2009-04-01	55.7090254193791
2009-07-01	55.3495431929077
2009-10-01	55.1321958833885
2010-01-01	55.0220046704262
2010-04-01	54.7062715302022
2010-07-01	54.3855345031074
2010-10-01	54.4998324968081
2011-01-01	54.5332118536971
2011-04-01	54.4308682114872
2011-07-01	54.3002977679695
2011-10-01	53.9421978565704
2012-01-01	53.7545626773796
2012-04-01	53.5417546173845
2012-07-01	53.4134025080445
2012-10-01	53.0267928362621
2013-01-01	52.3947363676455
2013-04-01	51.8670246621227
2013-07-01	51.6801920817343
2013-10-01	51.7265451839736
2014-01-01	51.6551402165492
2014-04-01	51.8031597793803
2014-07-01	51.7054774361477
2014-10-01	51.8032743586884
2015-01-01	51.9132209611015
2015-04-01	51.9571174583481
2015-07-01	52.4998755874524
2015-10-01	52.5043155531566
2016-01-01	52.6275727931538
2016-04-01	52.9266402587942
2016-07-01	52.7174515803977
2016-10-01	52.9228701995009
2017-01-01	53.1849540963017
2017-04-01	53.1121035280787
2017-07-01	53.2365433286729
2017-10-01	53.3750355384794
2018-01-01	53.4180542437380
2018-04-01	53.7238681408222