Quarter	Percent, Seasonally Adjusted
1999-01-01	15.8697035836884
1999-04-01	16.1688690152084
1999-07-01	16.5241257295353
1999-10-01	16.8509068895759
2000-01-01	17.4770052252773
2000-04-01	17.8221762668017
2000-07-01	18.2985747188632
2000-10-01	18.6520824776199
2001-01-01	18.3295703674202
2001-04-01	17.6296543555016
2001-07-01	17.1185030590262
2001-10-01	16.5887090041470
2002-01-01	16.7382663281991
2002-04-01	17.1767387031252
2002-07-01	17.2330685380122
2002-10-01	17.5525776060134
2003-01-01	18.0182047975111
2003-04-01	17.6900219375665
2003-07-01	17.4102789161647
2003-10-01	17.9360088387580
2004-01-01	18.3066837134755
2004-04-01	18.9725575937757
2004-07-01	19.1942216315818
2004-10-01	19.6470483579111
2005-01-01	19.6113261799044
2005-04-01	19.9311320333457
2005-07-01	20.2840460883321
2005-10-01	20.8890411719221
2006-01-01	21.2332952206351
2006-04-01	21.7145859256612
2006-07-01	21.9559542390610
2006-10-01	21.9333279502398
2007-01-01	22.0522106765560
2007-04-01	22.3643579708286
2007-07-01	22.5788185325716
2007-10-01	23.0248408800215
2008-01-01	23.8622286421237
2008-04-01	24.4361868752035
2008-07-01	24.8891978478860
2008-10-01	21.9019175844515
2009-01-01	18.8184188213633
2009-04-01	18.2741958747364
2009-07-01	19.2940141260599
2009-10-01	20.0075110208298
2010-01-01	20.6405921614030
2010-04-01	21.4720392781132
2010-07-01	21.6961028086974
2010-10-01	22.2697965379407
2011-01-01	23.3615356063676
2011-04-01	23.8225972234354
2011-07-01	23.8404614409468
2011-10-01	23.5399366224859
2012-01-01	23.5289415073652
2012-04-01	23.4225859019504
2012-07-01	23.0565995017159
2012-10-01	22.8826925523470
2013-01-01	23.0578513637154
2013-04-01	22.9713802113402
2013-07-01	23.0752891729785
2013-10-01	23.0266053202283
2014-01-01	23.2814470889587
2014-04-01	22.9965257900150
2014-07-01	22.8309998160032
2014-10-01	22.5263937407194
2015-01-01	21.7888971279914
2015-04-01	21.6611154046710
2015-07-01	21.4480246110790
2015-10-01	21.0442412860968
2016-01-01	20.4624579066514
2016-04-01	20.4221190203261
2016-07-01	20.5754727632407
2016-10-01	20.8765055159433
2017-01-01	21.5098317057481
2017-04-01	21.5672859699437
2017-07-01	21.7760870036051
2017-10-01	22.2632370571451
2018-01-01	22.5598976242985
2018-04-01	22.4976135353117