Quarter	Percent, Seasonally Adjusted
1998-01-01	62.4836933923591
1998-04-01	63.5005602896140
1998-07-01	62.2048746047590
1998-10-01	62.3888431388605
1999-01-01	62.8557074186170
1999-04-01	62.4933675722797
1999-07-01	62.8433864308878
1999-10-01	61.8993883975352
2000-01-01	63.5029246906387
2000-04-01	64.1887319888426
2000-07-01	64.0354322237610
2000-10-01	63.5022939227507
2001-01-01	65.7019494974090
2001-04-01	66.0188655781024
2001-07-01	66.0565579912820
2001-10-01	66.7460987989481
2002-01-01	65.7292147024366
2002-04-01	66.9477428587709
2002-07-01	66.6867289146785
2002-10-01	67.9028573931910
2003-01-01	67.9035010170601
2003-04-01	69.0553634319095
2003-07-01	69.0757575862953
2003-10-01	69.0560140642911
2004-01-01	65.7833094534908
2004-04-01	66.1803902030443
2004-07-01	67.0538490481774
2004-10-01	67.1102269977860
2005-01-01	68.7768799526574
2005-04-01	69.5282139410222
2005-07-01	69.4967440884760
2005-10-01	70.4492724499847
2006-01-01	70.0063292123756
2006-04-01	71.7684888789862
2006-07-01	71.6948947769002
2006-10-01	72.1334022314277
2007-01-01	72.3573698455752
2007-04-01	72.5147834198494
2007-07-01	72.4746273463846
2007-10-01	72.6162818338770
2008-01-01	74.0897658173950
2008-04-01	73.5012052957652
2008-07-01	74.5659661818152
2008-10-01	73.4421363748504
2009-01-01	72.3657710191298
2009-04-01	72.9078089905054
2009-07-01	72.2284686086233
2009-10-01	72.8245752639477
2010-01-01	72.5437584407430
2010-04-01	73.1662268955310
2010-07-01	72.9739752884869
2010-10-01	73.1078623440739
2011-01-01	73.4577354482385
2011-04-01	73.6318304297345
2011-07-01	73.8572537365481
2011-10-01	72.7083420868753
2012-01-01	72.8453387066884
2012-04-01	72.7455653488891
2012-07-01	72.8906537003839
2012-10-01	73.3689698310692
2013-01-01	74.3692691525268
2013-04-01	74.6219121098962
2013-07-01	75.3332684360096
2013-10-01	74.6700531498172
2014-01-01	74.2309106053991
2014-04-01	73.8691197494031
2014-07-01	73.7600705870899
2014-10-01	73.7686241665623
2015-01-01	74.9774115397588
2015-04-01	75.7322558557267
2015-07-01	75.9325757238319
2015-10-01	76.1654335398226
2016-01-01	77.6649090092795
2016-04-01	77.0097009666504
2016-07-01	77.1705426026381
2016-10-01	76.6315658343183
2017-01-01	75.2662056032252
2017-04-01	75.4593129435392
2017-07-01	77.2219963733600
2017-10-01	76.3015314268681
2018-01-01	77.5789526461711
2018-04-01	77.8591941758446