Quarter	Percent, Seasonally Adjusted
1999-01-01	17.4051585166301
1999-04-01	17.2709112314388
1999-07-01	16.9605150412483
1999-10-01	16.9473366695237
2000-01-01	16.4598868853773
2000-04-01	16.3930158696157
2000-07-01	16.4037466326557
2000-10-01	16.2041006859255
2001-01-01	16.4009043085316
2001-04-01	17.0297177469779
2001-07-01	17.2166032885703
2001-10-01	17.1894025643454
2002-01-01	17.7515991456315
2002-04-01	17.6616768430777
2002-07-01	17.7781279280892
2002-10-01	17.9292731743050
2003-01-01	17.5499513943716
2003-04-01	17.5934800577285
2003-07-01	17.6388129027674
2003-10-01	17.4092226643498
2004-01-01	17.7144162251006
2004-04-01	17.7247335850487
2004-07-01	17.5746114616195
2004-10-01	17.5472047230983
2005-01-01	17.4971566474324
2005-04-01	17.0662392566347
2005-07-01	16.9822359057346
2005-10-01	16.9652097035288
2006-01-01	16.6498974915426
2006-04-01	16.4229876670164
2006-07-01	16.5382291494093
2006-10-01	16.5822623469444
2007-01-01	16.5350042066939
2007-04-01	16.4859938026826
2007-07-01	16.6518548097384
2007-10-01	16.6157837558993
2008-01-01	16.3607256758002
2008-04-01	16.5331828586389
2008-07-01	16.6930799874896
2008-10-01	18.4411622242038
2009-01-01	19.8316070383203
2009-04-01	19.9774178975836
2009-07-01	19.5086184621199
2009-10-01	18.8633877858611
2010-01-01	18.7350015531008
2010-04-01	18.5584170511135
2010-07-01	18.4897519888351
2010-10-01	18.0896884135334
2011-01-01	17.9270693481869
2011-04-01	18.0099890179385
2011-07-01	18.0924065941186
2011-10-01	18.0800376926950
2012-01-01	18.3747060617506
2012-04-01	18.5377863426237
2012-07-01	18.6966477881676
2012-10-01	19.0929552143970
2013-01-01	19.3568112151869
2013-04-01	19.3323556408092
2013-07-01	19.4996030752330
2013-10-01	19.5159188394110
2014-01-01	19.8623228172830
2014-04-01	20.1699951045323
2014-07-01	20.1048871862747
2014-10-01	20.4383881761908
2015-01-01	20.9917820784502
2015-04-01	20.9438868660077
2015-07-01	21.2083296499916
2015-10-01	21.7871758372974
2016-01-01	21.9279202479048
2016-04-01	21.4769712372921
2016-07-01	21.4914989073651
2016-10-01	21.4616585448253
2017-01-01	21.1872860832838
2017-04-01	21.2535819387654
2017-07-01	21.0354269792829
2017-10-01	21.0607305310560
2018-01-01	20.7992664549636