Quarter	Percent, Seasonally Adjusted
1999-01-01	23.0551066470649
1999-04-01	22.9804645421028
1999-07-01	22.8207623952897
1999-10-01	22.7102495938353
2000-01-01	22.8473704811866
2000-04-01	22.7043359241434
2000-07-01	22.6464785442062
2000-10-01	22.4203227130161
2001-01-01	22.6014994194147
2001-04-01	22.9102793422168
2001-07-01	22.9755372389889
2001-10-01	23.2620806827487
2002-01-01	22.9777689377469
2002-04-01	23.0547977215422
2002-07-01	23.0157291073100
2002-10-01	23.0036162485884
2003-01-01	22.7594187369678
2003-04-01	22.1220956261518
2003-07-01	22.0008105906446
2003-10-01	21.8228401571374
2004-01-01	22.0715015581431
2004-04-01	22.2154800867481
2004-07-01	22.2397317864694
2004-10-01	22.0116891554509
2005-01-01	21.7446069856170
2005-04-01	21.4406810773273
2005-07-01	20.9816177437711
2005-10-01	20.9384609609512
2006-01-01	20.3393643629809
2006-04-01	20.0312051611825
2006-07-01	20.1456547698688
2006-10-01	19.7071984790769
2007-01-01	19.9163681283775
2007-04-01	19.9728684114224
2007-07-01	19.8868850475517
2007-10-01	19.6430074246191
2008-01-01	19.8599244415834
2008-04-01	19.8944978827560
2008-07-01	19.5139073923649
2008-10-01	19.6150287964476
2009-01-01	19.6684698680441
2009-04-01	19.7522990643274
2009-07-01	19.8889906702121
2009-10-01	19.5877494189713
2010-01-01	19.0911408038473
2010-04-01	19.0682380866429
2010-07-01	19.0143315732152
2010-10-01	19.2617844611047
2011-01-01	19.3616746751776
2011-04-01	18.7725539389599
2011-07-01	18.6650397955467
2011-10-01	18.1705766515429
2012-01-01	17.6090158085785
2012-04-01	17.2402242677019
2012-07-01	16.8157478954743
2012-10-01	16.7250959282786
2013-01-01	17.3572420442132
2013-04-01	16.6653180573178
2013-07-01	16.5812797340690
2013-10-01	16.2400758942656
2014-01-01	15.1590072652500
2014-04-01	15.1780413248250
2014-07-01	14.8284741819506
2014-10-01	14.7811135370373
2015-01-01	14.3026842229901
2015-04-01	14.3160837289190
2015-07-01	14.1142206946237
2015-10-01	14.0575956490851
2016-01-01	14.1068687016690
2016-04-01	13.8740260529155
2016-07-01	13.8867059841845
2016-10-01	13.6684357869912
2017-01-01	13.4820912230059
2017-04-01	13.1510113109328
2017-07-01	12.9888871448664
2017-10-01	12.9317828909386
2018-01-01	12.7299219666439
2018-04-01	12.6778777920689