Quarter	Percent, Seasonally Adjusted
1999-01-01	14.46282412435320
1999-04-01	15.74114539594120
1999-07-01	17.10410521208390
1999-10-01	18.00809309073580
2000-01-01	18.73072115074560
2000-04-01	19.07574769724990
2000-07-01	18.93797081744000
2000-10-01	19.09650975838810
2001-01-01	19.84399993879160
2001-04-01	19.90985527444260
2001-07-01	19.86473576803690
2001-10-01	19.70601412627570
2002-01-01	18.88142848994220
2002-04-01	18.83926309826900
2002-07-01	18.73191047608400
2002-10-01	18.26053128835350
2003-01-01	17.89116875651310
2003-04-01	17.17839945023190
2003-07-01	17.21621669867210
2003-10-01	17.48082192386200
2004-01-01	17.99731516835120
2004-04-01	17.82009104938740
2004-07-01	17.14848741041710
2004-10-01	16.84720644566870
2005-01-01	16.30248348823880
2005-04-01	15.90310005763430
2005-07-01	15.16610215995150
2005-10-01	14.61215617066320
2006-01-01	13.53333891697420
2006-04-01	12.55746980695810
2006-07-01	11.91161020017530
2006-10-01	11.21684728230790
2007-01-01	10.56994646311120
2007-04-01	10.12163891540970
2007-07-01	9.81602835494184
2007-10-01	9.18361814653455
2008-01-01	9.04994785963300
2008-04-01	9.15265007685403
2008-07-01	7.62756992917865
2008-10-01	7.72785712713194
2009-01-01	9.44108940703242
2009-04-01	10.73259920282290
2009-07-01	12.06273841238300
2009-10-01	13.46967478944300
2010-01-01	14.45947004966130
2010-04-01	14.35176951636920
2010-07-01	14.34802347269210
2010-10-01	13.85770994722300
2011-01-01	13.71657000615620
2011-04-01	13.72093231471260
2011-07-01	13.56675051872980
2011-10-01	13.70724470651900
2012-01-01	13.46952721112880
2012-04-01	13.56847733567850
2012-07-01	13.47558713860470
2012-10-01	13.78021442415570
2013-01-01	13.75682181055830
2013-04-01	14.03733471152230
2013-07-01	14.12003647628260
2013-10-01	14.17675796329800
2014-01-01	13.78237124630040
2014-04-01	13.30085846526590
2014-07-01	12.55175218332330
2014-10-01	11.79170956250940
2015-01-01	11.34221059420510
2015-04-01	10.49469467053960
2015-07-01	10.13042413866980
2015-10-01	9.57943610076854
2016-01-01	9.12325975701472
2016-04-01	8.86409197473241
2016-07-01	8.70068247209613
2016-10-01	8.60424545964376
2017-01-01	8.49641114559949
2017-04-01	8.22429115832150
2017-07-01	7.81900299534345
2017-10-01	7.30035865004101
2018-01-01	6.82589045956273
2018-04-01	6.45987795387234