Quarter	Percent, Seasonally Adjusted
1999-01-01	49.2815960203500
1999-04-01	48.9367068954000
1999-07-01	49.0155484249897
1999-10-01	48.9362413497387
2000-01-01	49.1705936108370
2000-04-01	48.7640185058593
2000-07-01	48.8653194316117
2000-10-01	49.0564140276676
2001-01-01	49.1169554990552
2001-04-01	49.7011618098009
2001-07-01	49.4551931342754
2001-10-01	50.0912188051315
2002-01-01	50.4435924940043
2002-04-01	50.3546297306674
2002-07-01	50.5550695254712
2002-10-01	50.7627276660975
2003-01-01	50.8857903619194
2003-04-01	51.4189618220586
2003-07-01	51.1542480328595
2003-10-01	50.9875970524076
2004-01-01	50.1663184443982
2004-04-01	50.2511784389773
2004-07-01	50.4700868433768
2004-10-01	50.6512161396860
2005-01-01	50.8855575661889
2005-04-01	51.1543007030704
2005-07-01	51.6045286499406
2005-10-01	51.5696784758233
2006-01-01	51.6595921859986
2006-04-01	51.9464095652937
2006-07-01	52.1075458866063
2006-10-01	52.2364777978172
2007-01-01	52.4630612037481
2007-04-01	52.7060158318435
2007-07-01	53.1883233108422
2007-10-01	53.0393048240162
2008-01-01	53.1553192437304
2008-04-01	53.2352344627610
2008-07-01	53.3558792126345
2008-10-01	53.7915066673747
2009-01-01	53.8218179758422
2009-04-01	54.0854844433256
2009-07-01	54.2398327490165
2009-10-01	54.0414365346492
2010-01-01	54.0271373685161
2010-04-01	54.0761447235358
2010-07-01	54.2022032580417
2010-10-01	54.3184309458900
2011-01-01	54.4624002822302
2011-04-01	54.3645685554819
2011-07-01	54.4890926634334
2011-10-01	54.7327419384001
2012-01-01	54.8805886497937
2012-04-01	54.9736497896020
2012-07-01	55.0793375107733
2012-10-01	55.0861427768063
2013-01-01	55.1185855537647
2013-04-01	55.2378397534700
2013-07-01	55.5296707628614
2013-10-01	55.2892458397136
2014-01-01	55.4968406903307
2014-04-01	55.4610981278027
2014-07-01	55.0278761257106
2014-10-01	55.2462088138751
2015-01-01	55.0225710372890
2015-04-01	55.2743708707985
2015-07-01	55.4610535551314
2015-10-01	55.6808472459854
2016-01-01	55.8111706258467
2016-04-01	55.8641145057261
2016-07-01	56.0670483363728
2016-10-01	55.8943883081836
2017-01-01	55.8848242297406
2017-04-01	55.9898436810984
2017-07-01	55.7986510778326
2017-10-01	55.9806365300283
2018-01-01	55.8541003594710
2018-04-01	55.7230814459000