Quarter	Percent, Seasonally Adjusted
1998-01-01	77.4117753600837
1998-04-01	77.5253534076920
1998-07-01	77.7595310432390
1998-10-01	77.6589933414651
1999-01-01	77.6422639968318
1999-04-01	77.3850494121039
1999-07-01	77.3188368399704
1999-10-01	77.5034278231565
2000-01-01	77.3450263967914
2000-04-01	77.5435943701314
2000-07-01	77.4389389243043
2000-10-01	77.3687230788529
2001-01-01	76.7019023042970
2001-04-01	76.8676163439444
2001-07-01	77.0475085556902
2001-10-01	77.1838344536618
2002-01-01	76.8221427362789
2002-04-01	77.2008365337745
2002-07-01	77.3413462460092
2002-10-01	77.5064465259115
2003-01-01	77.7961455072150
2003-04-01	77.6736862439609
2003-07-01	77.6883996732026
2003-10-01	77.7228848582956
2004-01-01	78.3308524786103
2004-04-01	78.3968143711280
2004-07-01	78.1995452795687
2004-10-01	78.2844428569240
2005-01-01	78.3267645755412
2005-04-01	78.3586444523557
2005-07-01	78.3135533123685
2005-10-01	78.4349081261490
2006-01-01	78.6372898592070
2006-04-01	78.4703079522388
2006-07-01	78.3995280513762
2006-10-01	78.4643852921000
2007-01-01	78.3166549202609
2007-04-01	78.1344477915436
2007-07-01	78.5186733333090
2007-10-01	78.4783678535197
2008-01-01	78.4746642182104
2008-04-01	78.5613301128794
2008-07-01	78.3763665075789
2008-10-01	78.3805025841194
2009-01-01	78.3911339211553
2009-04-01	78.4791514146780
2009-07-01	78.7460743898973
2009-10-01	78.5144501707565
2010-01-01	78.6371111242379
2010-04-01	78.4604898858631
2010-07-01	78.1843575795075
2010-10-01	78.1140622748922
2011-01-01	77.6098293447263
2011-04-01	77.4256021620313
2011-07-01	77.0922640276985
2011-10-01	76.8401018076814
2012-01-01	76.8943526198376
2012-04-01	76.8431741028679
2012-07-01	76.6623681616114
2012-10-01	77.0685456923434
2013-01-01	76.8761665388124
2013-04-01	77.0034275839686
2013-07-01	76.8666963643846
2013-10-01	76.6750649087590
2014-01-01	76.5195471082529
2014-04-01	76.0988864142571
2014-07-01	75.9385734194362
2014-10-01	75.5978751350902
2015-01-01	75.5912500818390
2015-04-01	75.6812459807300
2015-07-01	75.9771943885919
2015-10-01	76.2701343132680
2016-01-01	76.0893782150065
2016-04-01	76.1402780003104
2016-07-01	76.2469398602598
2016-10-01	76.1296767997681
2017-01-01	76.3147319613106
2017-04-01	76.4663716960441
2017-07-01	76.5922328397356
2017-10-01	76.4031097661223
2018-01-01	76.4349382826903
2018-04-01	76.5617054718646