Quarter	Percent, Seasonally Adjusted
1998-01-01	72.2883658766587
1998-04-01	70.9810184206929
1998-07-01	73.0396019411032
1998-10-01	73.0888357593543
1999-01-01	73.3606591182560
1999-04-01	74.3888607606004
1999-07-01	73.8098828370961
1999-10-01	73.9170419673880
2000-01-01	74.1485181440532
2000-04-01	74.7100631374334
2000-07-01	74.7323405601927
2000-10-01	74.4861841322029
2001-01-01	74.6420099393304
2001-04-01	75.0912326620446
2001-07-01	74.9575832463496
2001-10-01	75.3367529047615
2002-01-01	74.8966425332967
2002-04-01	75.1030336790738
2002-07-01	74.9667463697119
2002-10-01	74.7654397498464
2003-01-01	74.7348699046163
2003-04-01	74.7307295480118
2003-07-01	74.3953239487893
2003-10-01	74.0413301475020
2004-01-01	74.0274083832512
2004-04-01	74.1797156093631
2004-07-01	74.4087165439721
2004-10-01	74.3333749795958
2005-01-01	74.7700243066188
2005-04-01	74.5996980624965
2005-07-01	74.4646713037803
2005-10-01	75.0656885751073
2006-01-01	75.1947600575227
2006-04-01	74.8670469652055
2006-07-01	75.4285489809058
2006-10-01	75.3560516617694
2007-01-01	75.2732414337148
2007-04-01	75.3916408338571
2007-07-01	75.8054877302893
2007-10-01	75.7360664254062
2008-01-01	75.7820100884096
2008-04-01	76.1902789396443
2008-07-01	75.8671166300427
2008-10-01	75.9915825207261
2009-01-01	75.4236629375663
2009-04-01	75.1995850540949
2009-07-01	74.5349824320988
2009-10-01	74.6946256103177
2010-01-01	74.5802490996422
2010-04-01	74.4718845488524
2010-07-01	74.3876207394146
2010-10-01	74.4942689947320
2011-01-01	74.7633954614729
2011-04-01	74.8943552302878
2011-07-01	75.0259161708375
2011-10-01	75.1085597734424
2012-01-01	75.0814713588241
2012-04-01	75.0987857807171
2012-07-01	75.7164229312141
2012-10-01	75.0870669483874
2013-01-01	75.1732600575262
2013-04-01	75.3452669257343
2013-07-01	74.9855338759381
2013-10-01	75.1072898294385
2014-01-01	75.1863152276281
2014-04-01	75.5195447815773
2014-07-01	75.2279060226581
2014-10-01	75.6019842105972
2015-01-01	75.6495945044864
2015-04-01	75.6739537022709
2015-07-01	76.0945139430064
2015-10-01	75.8262267858882
2016-01-01	75.9397583585242
2016-04-01	75.7950908932445
2016-07-01	76.0109858585684
2016-10-01	75.9119146907734
2017-01-01	76.1985367459600
2017-04-01	76.4997517892213
2017-07-01	76.6794865753834
2017-10-01	77.5892236196849
2018-01-01	77.9131313810289
2018-04-01	77.8085235116587