Quarter	Percent, Seasonally Adjusted
1999-04-01	61.6295918559118
1999-07-01	61.5662087123745
1999-10-01	62.2570545751947
2000-01-01	63.0696772395615
2000-04-01	62.8865798088074
2000-07-01	63.2474979453012
2000-10-01	63.6882442932437
2001-01-01	64.0655111413842
2001-04-01	64.5923551821382
2001-07-01	64.6047694111635
2001-10-01	65.2205295386828
2002-01-01	64.7481111659807
2002-04-01	64.9363042248865
2002-07-01	65.2457301108486
2002-10-01	65.0077178172085
2003-01-01	64.5620422975688
2003-04-01	64.7393196597427
2003-07-01	64.3423858008342
2003-10-01	64.7033316444465
2004-01-01	65.7422119756614
2004-04-01	64.6621483347501
2004-07-01	64.4652491429352
2004-10-01	65.1222661673874
2005-01-01	65.4583479418758
2005-04-01	65.6997892307956
2005-07-01	65.9138310506847
2005-10-01	65.6349212006773
2006-01-01	67.2784519755309
2006-04-01	66.5299434535814
2006-07-01	66.7053846093470
2006-10-01	67.2199116195976
2007-01-01	67.3661208930687
2007-04-01	67.7448283471076
2007-07-01	68.0821515103571
2007-10-01	66.9407900534838
2008-01-01	66.7099886667909
2008-04-01	66.0964600304211
2008-07-01	65.7689747254890
2008-10-01	65.4038498531294
2009-01-01	62.4768916688833
2009-04-01	61.5687716621364
2009-07-01	60.1284043616636
2009-10-01	58.4560060418627
2010-01-01	58.1186923342130
2010-04-01	57.8173664341962
2010-07-01	57.8945168158710
2010-10-01	57.0494623537621
2011-01-01	56.7502644822578
2011-04-01	57.2875305187281
2011-07-01	56.5401808317803
2011-10-01	56.0791872161075
2012-01-01	54.9726988179842
2012-04-01	55.4724075787044
2012-07-01	54.9897379779554
2012-10-01	56.2658770626466
2013-01-01	57.5748758587671
2013-04-01	57.9519834943778
2013-07-01	59.0014741524726
2013-10-01	60.7096727157343
2014-01-01	60.4062757977278
2014-04-01	59.6916119343351
2014-07-01	61.5487461720064
2014-10-01	61.6753416490466
2015-01-01	62.8735757691016
2015-04-01	64.6980308455755
2015-07-01	64.7422665089266
2015-10-01	65.6523573845051
2016-01-01	65.2436499251257
2016-04-01	65.3735356366740
2016-07-01	65.2290580049572
2016-10-01	65.7270234942386
2017-01-01	65.9353577067994
2017-04-01	66.7635737039483
2017-07-01	67.8929412126626
2017-10-01	66.4016664859122
2018-01-01	67.8470755422486
2018-04-01	68.9663306834410