Quarter	Percent, Seasonally Adjusted
1998-01-01	65.9753871100094
1998-04-01	66.1846913028944
1998-07-01	66.3933183693161
1998-10-01	66.5430140579266
1999-01-01	66.7966289184223
1999-04-01	66.9047412463978
1999-07-01	67.0109573178938
1999-10-01	67.3456599502268
2000-01-01	67.2392863403598
2000-04-01	67.6643973746646
2000-07-01	68.2079265498857
2000-10-01	68.6910976763102
2001-01-01	68.9704632421288
2001-04-01	69.0105004913219
2001-07-01	69.3201368254743
2001-10-01	69.3588308183196
2002-01-01	69.9870373967306
2002-04-01	69.7906445373410
2002-07-01	70.1244817064620
2002-10-01	70.3106710669603
2003-01-01	70.5606826408802
2003-04-01	70.6306561443799
2003-07-01	70.8762447205069
2003-10-01	70.8895777513253
2004-01-01	72.1250978469559
2004-04-01	72.3878522921646
2004-07-01	72.3663731267290
2004-10-01	72.5025212848339
2005-01-01	72.3397200123417
2005-04-01	72.2805750538027
2005-07-01	72.1608540502225
2005-10-01	72.3634527482226
2006-01-01	73.1280982929615
2006-04-01	73.4919969192431
2006-07-01	73.0695452611884
2006-10-01	73.2648889156427
2007-01-01	73.0363665446205
2007-04-01	73.2629680567819
2007-07-01	73.6955728278919
2007-10-01	73.6618340864741
2008-01-01	73.6006006898482
2008-04-01	73.5317175389830
2008-07-01	73.4938445977420
2008-10-01	73.1285975435486
2009-01-01	72.3704152224330
2009-04-01	72.0258524405436
2009-07-01	71.7080211072949
2009-10-01	71.2877868311218
2010-01-01	71.1282334389354
2010-04-01	71.1539507500953
2010-07-01	70.9515704111375
2010-10-01	71.0916483366553
2011-01-01	71.3008148750161
2011-04-01	71.4104990125368
2011-07-01	71.1180189042564
2011-10-01	70.6275457223254
2012-01-01	70.7159665094888
2012-04-01	70.5609862216056
2012-07-01	70.2233779399239
2012-10-01	69.9592925378844
2013-01-01	69.3172732812468
2013-04-01	68.3999157919712
2013-07-01	68.0913696689816
2013-10-01	68.2330726965231
2014-01-01	68.0572258049276
2014-04-01	67.7351510229232
2014-07-01	67.7506672548072
2014-10-01	67.8991985372172
2015-01-01	68.0080541716742
2015-04-01	67.9204473403986
2015-07-01	68.3692764181338
2015-10-01	68.4735351326417
2016-01-01	68.5550383902376
2016-04-01	68.9278624301359
2016-07-01	68.8982585248522
2016-10-01	69.0026881790104
2017-01-01	69.4028243933191
2017-04-01	69.2534547445580
2017-07-01	69.4772304802444
2017-10-01	69.4729266775941
2018-01-01	69.3892835280179
2018-04-01	70.0896109667742