Quarter	Percent, Seasonally Adjusted
1998-01-01	67.4005437578989
1998-04-01	67.1671702721196
1998-07-01	66.7319392340321
1998-10-01	66.3225403111768
1999-01-01	65.5963907823391
1999-04-01	65.0873771028976
1999-07-01	64.8622124022098
1999-10-01	64.5512889207430
2000-01-01	64.3465462798971
2000-04-01	64.2932943360220
2000-07-01	64.3017055937777
2000-10-01	64.2065903503623
2001-01-01	64.4064027004725
2001-04-01	64.2960785825803
2001-07-01	64.1911475380177
2001-10-01	64.4037724894666
2002-01-01	64.6913882620209
2002-04-01	64.9343281120602
2002-07-01	64.9691531771323
2002-10-01	64.9427290632892
2003-01-01	64.7507634728933
2003-04-01	64.3634085109255
2003-07-01	63.9846981561407
2003-10-01	63.7552233743045
2004-01-01	63.4369821973101
2004-04-01	63.3302760520730
2004-07-01	63.4912772126428
2004-10-01	63.6807332416966
2005-01-01	63.9489753977988
2005-04-01	64.2741120556510
2005-07-01	64.4920457310307
2005-10-01	64.3759167714986
2006-01-01	64.4557178923337
2006-04-01	64.5500420324535
2006-07-01	64.5258818924836
2006-10-01	64.7451681826200
2007-01-01	65.1867624613843
2007-04-01	65.2547876429827
2007-07-01	65.5799280953746
2007-10-01	65.7852816197641
2008-01-01	65.8592842988520
2008-04-01	65.8380523204229
2008-07-01	65.8240433546541
2008-10-01	65.8552243455348
2009-01-01	65.1285235169406
2009-04-01	64.4838105044462
2009-07-01	63.8740619151423
2009-10-01	63.7342843989231
2010-01-01	63.3754239311065
2010-04-01	63.6661606506274
2010-07-01	63.9465591327466
2010-10-01	63.8177691085301
2011-01-01	63.6108521121902
2011-04-01	63.6868541537568
2011-07-01	63.6120874006447
2011-10-01	63.4996178323951
2012-01-01	63.4561328463434
2012-04-01	63.5595730854973
2012-07-01	63.7685026544149
2012-10-01	63.6632877400435
2013-01-01	63.8012764357305
2013-04-01	64.1248764082993
2013-07-01	64.0749449469476
2013-10-01	64.2123191518331
2014-01-01	64.4858670146391
2014-04-01	64.6812371298980
2014-07-01	64.8686357093243
2014-10-01	64.8544748970264
2015-01-01	64.7835113463206
2015-04-01	65.0662918818333
2015-07-01	65.1314896899828
2015-10-01	65.5676695693758
2016-01-01	65.8734245713746
2016-04-01	65.9348821638229
2016-07-01	66.1389004740562
2016-10-01	66.3473306600662
2017-01-01	66.6004943652102
2017-04-01	66.8201985174944
2017-07-01	67.1088664456360
2017-10-01	67.2395186976328
2018-01-01	67.4605896658717
2018-04-01	67.5544915530502