Quarter	Percent, Seasonally Adjusted
1998-01-01	62.4381033623286
1998-04-01	62.3330561064428
1998-07-01	62.0241973908940
1998-10-01	62.5274301972706
1999-01-01	62.7433665988011
1999-04-01	62.9820563083425
1999-07-01	63.0123164143075
1999-10-01	63.1480911174954
2000-01-01	63.7275736627046
2000-04-01	63.6461216519064
2000-07-01	64.1946547009869
2000-10-01	64.0244416377711
2001-01-01	64.7795064112954
2001-04-01	64.5638468392412
2001-07-01	64.6470400335208
2001-10-01	65.0292812661402
2002-01-01	64.9717081141087
2002-04-01	65.3737593059288
2002-07-01	65.8391569938504
2002-10-01	66.0553115835818
2003-01-01	66.5931920079276
2003-04-01	66.5380298873336
2003-07-01	66.1704505387075
2003-10-01	66.3183597426987
2004-01-01	66.2182640911240
2004-04-01	66.5256051441520
2004-07-01	66.9918411312462
2004-10-01	67.4168296030415
2005-01-01	67.3912464840766
2005-04-01	67.5799587309811
2005-07-01	67.9708157650522
2005-10-01	68.0809280559919
2006-01-01	67.9840313446292
2006-04-01	68.2066035863880
2006-07-01	68.4399884808993
2006-10-01	68.3678029097934
2007-01-01	68.5035405757964
2007-04-01	68.4899061688566
2007-07-01	68.9592239070356
2007-10-01	68.9748476529122
2008-01-01	68.5986471231248
2008-04-01	69.1419947302081
2008-07-01	69.0365516110117
2008-10-01	68.6684475033968
2009-01-01	69.0369575357117
2009-04-01	68.6815671064058
2009-07-01	68.7128380738297
2009-10-01	69.0546226279932
2010-01-01	69.7364558208874
2010-04-01	69.7666901045235
2010-07-01	69.7269721463034
2010-10-01	69.5553976244630
2011-01-01	69.6393537710550
2011-04-01	69.9613801187494
2011-07-01	69.2724013294024
2011-10-01	69.1036214472054
2012-01-01	69.6105579022872
2012-04-01	69.8331691276996
2012-07-01	69.9561523377119
2012-10-01	69.4769437534382
2013-01-01	69.3001735563396
2013-04-01	69.5912965021921
2013-07-01	69.8048848891481
2013-10-01	70.4037432079056
2014-01-01	69.8016323000439
2014-04-01	69.9871937500831
2014-07-01	70.2396350166667
2014-10-01	69.9600733770663
2015-01-01	70.3454873314292
2015-04-01	70.3720236226300
2015-07-01	70.3779165304621
2015-10-01	70.2227721095188
2016-01-01	70.4398014217299
2016-04-01	70.0994806010372
2016-07-01	70.6791047846969
2016-10-01	70.8755655642118
2017-01-01	71.0926742669290
2017-04-01	71.3603721400632
2017-07-01	72.0585958918072
2017-10-01	72.0212912380551
2018-01-01	72.1290503895642
2018-04-01	72.3657571457328