Quarter	Percent, Seasonally Adjusted
1999-01-01	58.0838123700776
1999-04-01	57.6973622798192
1999-07-01	57.5683218634027
1999-10-01	57.4591038354422
2000-01-01	57.8754088813079
2000-04-01	58.0896672990555
2000-07-01	58.8070962852094
2000-10-01	58.7899091124765
2001-01-01	58.8879999057473
2001-04-01	58.1853658794222
2001-07-01	59.2119463394450
2001-10-01	59.0437103100558
2002-01-01	59.1719629238131
2002-04-01	59.3199767906101
2002-07-01	58.3876017244103
2002-10-01	57.4844999096734
2003-01-01	57.9641919824579
2003-04-01	57.2251557892465
2003-07-01	56.8747065075609
2003-10-01	58.4646463536233
2004-01-01	59.6264840516102
2004-04-01	60.8261494498129
2004-07-01	61.3750585089041
2004-10-01	60.0120626126676
2005-01-01	60.8536776400663
2005-04-01	61.2090171744861
2005-07-01	61.5463696694190
2005-10-01	61.7266867255777
2006-01-01	61.7490155690228
2006-04-01	62.8355114102055
2006-07-01	61.4991872863812
2006-10-01	61.2834322367064
2007-01-01	61.8228769258322
2007-04-01	62.8880559056545
2007-07-01	63.0439826469023
2007-10-01	62.6625876061551
2008-01-01	63.2601693317120
2008-04-01	63.3284094451523
2008-07-01	64.9225096222018
2008-10-01	65.3216292373520
2009-01-01	64.1268436890950
2009-04-01	63.3382518788253
2009-07-01	64.0336387044204
2009-10-01	63.7975827356218
2010-01-01	63.1446459771648
2010-04-01	63.3592668694973
2010-07-01	61.4862725883256
2010-10-01	62.2602049385064
2011-01-01	60.7198944851077
2011-04-01	60.7609258082158
2011-07-01	60.8267964345267
2011-10-01	61.3156729741524
2012-01-01	61.9370289296797
2012-04-01	60.0129307712542
2012-07-01	59.9142640453478
2012-10-01	60.3067950229224
2013-01-01	59.1377300617647
2013-04-01	58.8583740170994
2013-07-01	59.6882638803019
2013-10-01	59.1408460117617
2014-01-01	59.6947698803565
2014-04-01	60.4124013989147
2014-07-01	60.0593954736431
2014-10-01	59.7463658295559
2015-01-01	59.9154842080317
2015-04-01	61.1288539027980
2015-07-01	61.5924038013314
2015-10-01	61.4795301826557
2016-01-01	61.6894754791575
2016-04-01	62.8052006070285
2016-07-01	62.1412242850505
2016-10-01	63.8980517714925
2017-01-01	65.0318561880490
2017-04-01	64.8194154910525
2017-07-01	66.2117623758470
2017-10-01	67.2877488183592
2018-01-01	67.0473506730913
2018-04-01	67.1284396280664