Quarter	Percent, Seasonally Adjusted
1999-01-01	15.3697504999350
1999-04-01	15.4990214131111
1999-07-01	15.8510038439264
1999-10-01	16.0988667250490
2000-01-01	16.3755644528661
2000-04-01	16.5981681293117
2000-07-01	16.9678501068469
2000-10-01	17.2313821067256
2001-01-01	17.1385923368900
2001-04-01	16.5152388071377
2001-07-01	16.1401227756511
2001-10-01	15.7442757408301
2002-01-01	15.8484412571437
2002-04-01	16.2782213352188
2002-07-01	16.3552774021317
2002-10-01	16.4125916118491
2003-01-01	16.6674841174988
2003-04-01	16.4791167549469
2003-07-01	16.5089725685510
2003-10-01	16.9613123402527
2004-01-01	17.3885771046694
2004-04-01	17.7878064386460
2004-07-01	17.7596460258534
2004-10-01	18.0596433248909
2005-01-01	18.0682181757143
2005-04-01	18.2951682866528
2005-07-01	18.4448301246235
2005-10-01	18.8645537963904
2006-01-01	19.3032742798630
2006-04-01	19.7891678803501
2006-07-01	19.7547148762773
2006-10-01	20.1636822226068
2007-01-01	20.2529559495209
2007-04-01	20.4870540297839
2007-07-01	20.7595202422159
2007-10-01	21.1234268869664
2008-01-01	21.8959897919598
2008-04-01	22.3782901483785
2008-07-01	22.5196515267696
2008-10-01	19.7443894411855
2009-01-01	17.4299918546398
2009-04-01	17.4633101933722
2009-07-01	18.3926697108116
2009-10-01	19.0255347439251
2010-01-01	19.4809759847168
2010-04-01	20.0412935474907
2010-07-01	20.3163458052499
2010-10-01	21.0177091657408
2011-01-01	21.8143090866963
2011-04-01	21.9800016716949
2011-07-01	22.1768145448994
2011-10-01	21.8659885844309
2012-01-01	21.8911494700986
2012-04-01	21.7687356103669
2012-07-01	21.5289997500427
2012-10-01	21.3896603231949
2013-01-01	21.6593417480645
2013-04-01	21.7038678603914
2013-07-01	21.6994695951709
2013-10-01	21.8182899253372
2014-01-01	21.8458869628975
2014-04-01	21.6113036207963
2014-07-01	21.5140366286260
2014-10-01	21.3736573804900
2015-01-01	20.5889609393964
2015-04-01	20.4772721152392
2015-07-01	20.2538969381120
2015-10-01	19.8840449373682
2016-01-01	19.4263167922880
2016-04-01	19.5726176986631
2016-07-01	19.5879343173592
2016-10-01	19.9247148692625
2017-01-01	20.4260796052900
2017-04-01	20.4533940892505
2017-07-01	20.7265333459877
2017-10-01	21.0167518285522
2018-01-01	21.2480431812873
2018-04-01	21.2899730791986