Quarter	Percent, Seasonally Adjusted
1998-01-01	80.1225888832657
1998-04-01	79.9961226509709
1998-07-01	80.0223733879386
1998-10-01	80.0533266153332
1999-01-01	80.0123877748793
1999-04-01	79.9742005220314
1999-07-01	79.8480511311714
1999-10-01	79.8109999889985
2000-01-01	79.5539062773790
2000-04-01	79.2153443153174
2000-07-01	79.0139845317964
2000-10-01	78.7150001422536
2001-01-01	78.7315882782327
2001-04-01	78.6330460849519
2001-07-01	78.4624894765694
2001-10-01	78.5024277542582
2002-01-01	78.4353856674062
2002-04-01	78.6227562599087
2002-07-01	78.5992711158575
2002-10-01	78.6100182542889
2003-01-01	78.2392575470872
2003-04-01	77.9951265512270
2003-07-01	77.8336410961260
2003-10-01	77.7542234293767
2004-01-01	77.6601208181569
2004-04-01	77.7999551548039
2004-07-01	77.9229559770438
2004-10-01	78.0163329088452
2005-01-01	78.3775509918172
2005-04-01	78.3718541625989
2005-07-01	78.4636726689266
2005-10-01	78.2068800993755
2006-01-01	78.4279223432345
2006-04-01	78.2769612225009
2006-07-01	78.1336494334563
2006-10-01	78.1949242905302
2007-01-01	78.0699392485686
2007-04-01	78.0300001541725
2007-07-01	78.1710456083396
2007-10-01	78.2370982041665
2008-01-01	78.0947751040470
2008-04-01	78.1459020550554
2008-07-01	78.0312659267122
2008-10-01	78.3017676327637
2009-01-01	78.3708224001963
2009-04-01	78.4188184013833
2009-07-01	78.5301598397237
2009-10-01	78.6828469288226
2010-01-01	78.4705890294916
2010-04-01	78.5511475350438
2010-07-01	78.7864635955735
2010-10-01	78.6477325760601
2011-01-01	78.4550244406472
2011-04-01	78.8634798869830
2011-07-01	78.6843479260264
2011-10-01	78.6403047205859
2012-01-01	78.9139628170839
2012-04-01	79.3278472383386
2012-07-01	79.7723295005904
2012-10-01	79.8654202912728
2013-01-01	80.1930266105735
2013-04-01	80.4769200952195
2013-07-01	80.5935991907941
2013-10-01	80.6847735231471
2014-01-01	80.9559078597797
2014-04-01	81.1464920737036
2014-07-01	81.3214875336444
2014-10-01	81.4706405624365
2015-01-01	81.4265434616002
2015-04-01	81.3161700131756
2015-07-01	81.2368288171336
2015-10-01	81.5034373219360
2016-01-01	81.8947447605616
2016-04-01	82.0165861477562
2016-07-01	82.2371243890330
2016-10-01	82.4694010963736
2017-01-01	82.6059942213830
2017-04-01	82.7552392311255
2017-07-01	83.0033263557710
2017-10-01	83.0913687754794
2018-01-01	83.1539983100906
2018-04-01	83.2918067535142