Quarter	Percent, Seasonally Adjusted
1999-01-01	56.1300778068754
1999-04-01	56.4982766068442
1999-07-01	56.5840638697083
1999-10-01	56.9440272928147
2000-01-01	56.9254828910268
2000-04-01	57.0933040951042
2000-07-01	57.4583058242988
2000-10-01	57.7664898325996
2001-01-01	57.3318446570346
2001-04-01	57.0346863821635
2001-07-01	57.0715720842322
2001-10-01	56.8146646784415
2002-01-01	57.0818371996609
2002-04-01	57.0444408033739
2002-07-01	57.0760158424918
2002-10-01	57.1352185457742
2003-01-01	57.1414733375678
2003-04-01	57.6747474482230
2003-07-01	57.7851172845033
2003-10-01	57.8605955520538
2004-01-01	57.7763205384754
2004-04-01	57.5492988368829
2004-07-01	57.3461360045208
2004-10-01	57.4087203194540
2005-01-01	57.4691096524485
2005-04-01	57.1727450862902
2005-07-01	57.5030107814156
2005-10-01	57.5648970828821
2006-01-01	57.7562171593634
2006-04-01	58.1787695912090
2006-07-01	57.9181974082133
2006-10-01	58.2812900846079
2007-01-01	58.2210003095467
2007-04-01	58.0250045288072
2007-07-01	57.8015739017103
2007-10-01	57.2473046271498
2008-01-01	57.2326320904807
2008-04-01	56.9580252814944
2008-07-01	57.0698539991616
2008-10-01	56.3345740926553
2009-01-01	55.7175242845110
2009-04-01	55.3878803107471
2009-07-01	54.5384554401850
2009-10-01	54.6686261088701
2010-01-01	54.1627515296066
2010-04-01	54.0311256751216
2010-07-01	54.3071981772881
2010-10-01	54.4402101772983
2011-01-01	54.6606551418358
2011-04-01	54.9814535020896
2011-07-01	55.1865132520067
2011-10-01	55.3270324570142
2012-01-01	55.3558662819201
2012-04-01	55.4320176922324
2012-07-01	55.8522411860714
2012-10-01	56.2839205698785
2013-01-01	55.7729680714590
2013-04-01	57.2551901449231
2013-07-01	57.7942705707019
2013-10-01	58.6136484172089
2014-01-01	60.5357650622701
2014-04-01	60.2357846072825
2014-07-01	61.0544698245299
2014-10-01	61.2602331463734
2015-01-01	61.7132054562898
2015-04-01	62.4287374295078
2015-07-01	63.1134506803121
2015-10-01	63.5904148971258
2016-01-01	64.3245637143390
2016-04-01	64.8657563412926
2016-07-01	65.1766424116568
2016-10-01	65.8261694589276
2017-01-01	66.1759954882662
2017-04-01	66.8327803708170
2017-07-01	67.1363488777870
2017-10-01	67.5188934663544
2018-01-01	67.8204400849146
2018-04-01	67.7258215394386