Quarter	Percent, Seasonally Adjusted
1981-01-01	16.3396092990365
1981-04-01	14.6690934438291
1981-07-01	16.4573952199515
1981-10-01	14.7073074043078
1982-01-01	17.9799023290759
1982-04-01	16.7230501965804
1982-07-01	18.4739154039781
1982-10-01	17.7495046407342
1983-01-01	17.5223924428564
1983-04-01	17.4442896935933
1983-07-01	18.6376330947809
1983-10-01	15.7407034366061
1984-01-01	16.0502030269472
1984-04-01	15.3003617186708
1984-07-01	15.9144641659903
1984-10-01	14.4797197240582
1985-01-01	16.1717413616148
1985-04-01	14.9034094349906
1985-07-01	16.0225750908743
1985-10-01	14.5560001240656
1986-01-01	15.7799656760907
1986-04-01	15.4279153130951
1986-07-01	16.4963763811334
1986-10-01	15.4099227447640
1987-01-01	16.1465240326526
1987-04-01	16.2225727013641
1987-07-01	17.1547266283191
1987-10-01	14.8764955101388
1988-01-01	15.2209410405205
1988-04-01	15.7785484028524
1988-07-01	17.2031981484404
1988-10-01	15.6734923434824
1989-01-01	16.8517403348187
1989-04-01	16.2117341221819
1989-07-01	18.1133591043727
1989-10-01	16.3247987586073
1990-01-01	17.8784023265325
1990-04-01	17.8449981108172
1990-07-01	20.2858325420593
1990-10-01	17.6668787257605
1991-01-01	19.3379126120969
1991-04-01	19.0541359118749
1991-07-01	20.1653121536757
1991-10-01	18.4098234145899
1992-01-01	19.6815894499393
1992-04-01	19.1419548008695
1992-07-01	19.5916020781876
1992-10-01	17.0804101457097
1993-01-01	19.0010308676794
1993-04-01	18.1891891891892
1993-07-01	19.9144935314912
1993-10-01	16.9994806311227
1994-01-01	19.0881479829092
1994-04-01	17.2677460297805
1994-07-01	16.7091319235950
1994-10-01	14.5754644557040
1995-01-01	15.8908507223114
1995-04-01	15.3472573128965
1995-07-01	17.2981777771012
1995-10-01	15.7074412337176
1996-01-01	16.8305608297673
1996-04-01	16.1678750070252
1996-07-01	17.4508992882715
1996-10-01	15.7459705193553
1997-01-01	16.2684073512841
1997-04-01	14.6614925373134
1997-07-01	16.1282370487237
1997-10-01	14.2698416411312
1998-01-01	15.5764207716294
1998-04-01	14.8040526356495
1998-07-01	16.0618644950085
1998-10-01	14.2722511967615
1999-01-01	15.2752821682573
1999-04-01	14.6149055428690
1999-07-01	16.1275268862822
1999-10-01	14.5391015960439
2000-01-01	15.1225908464216
2000-04-01	14.4572034595622
2000-07-01	15.9282416313967
2000-10-01	14.4941938570824
2001-01-01	15.8337503422620
2001-04-01	14.8542472719955
2001-07-01	16.6544010162007
2001-10-01	15.6268058904410
2002-01-01	16.2353927370343
2002-04-01	15.5265362619750
2002-07-01	16.9519321394910
2002-10-01	15.7002092378029
2003-01-01	16.6036283775540
2003-04-01	15.8886352057664
2003-07-01	18.4083633858746
2003-10-01	17.4991629079593
2004-01-01	18.2054377746656
2004-04-01	16.5734918323027
2004-07-01	17.3065424963311
2004-10-01	16.4865532607999
2005-01-01	17.7058912669478
2005-04-01	16.3878935984017
2005-07-01	17.3547347631752
2005-10-01	16.3268428254532
2006-01-01	17.5875690888746
2006-04-01	16.4793708775652
2006-07-01	17.4142066952988
2006-10-01	16.4707417952211
2007-01-01	17.4728271609818
2007-04-01	17.2492947405032
2007-07-01	17.7518462145555
2007-10-01	17.6387624013733
2008-01-01	19.0044854421251
2008-04-01	17.3816594769967
2008-07-01	17.4819096460158
2008-10-01	16.9618673615444
2009-01-01	21.1908604433874
2009-04-01	20.6735445324441
2009-07-01	19.8946116799685
2009-10-01	19.1860904623913
2010-01-01	21.0716455654630
2010-04-01	19.7352280880413
2010-07-01	19.2432146367279
2010-10-01	18.8037050285793
2011-01-01	19.7468582496284
2011-04-01	19.2995884889257
2011-07-01	18.9413887777099
2011-10-01	17.6109920445009
2012-01-01	19.4597322860778
2012-04-01	19.0399237025459
2012-07-01	19.3195393510776
2012-10-01	18.4384405161380
2013-01-01	20.2192011367007
2013-04-01	19.3462165730410
2013-07-01	19.2323309058522
2013-10-01	18.2692371196661
2014-01-01	20.0916008651917
2014-04-01	19.0695609393187
2014-07-01	18.6528307197181
2014-10-01	18.0000733424604
2015-01-01	19.9527399846527
2015-04-01	19.3235764073825
2015-07-01	18.7830825868916
2015-10-01	18.3713355048860
2016-01-01	20.1355131546771
2016-04-01	19.5626529058652
2016-07-01	19.1042545302869
2016-10-01	19.0196195717191
2017-01-01	20.3740903907051
2017-04-01	18.7903752825600
2017-07-01	19.5028003200366
2017-10-01	18.9490382932599
2018-01-01	20.1829915674906
2018-04-01	18.9630120574065