Quarter	Percent
1968-01-01	53.9116270398100
1968-04-01	59.6563927948791
1968-07-01	58.7578664144692
1968-10-01	56.5837502886952
1969-01-01	53.2892424107010
1969-04-01	58.0945387945388
1969-07-01	57.3901481087110
1969-10-01	55.4561903404597
1970-01-01	53.6676537551525
1970-04-01	58.5291022543687
1970-07-01	58.0263217177318
1970-10-01	55.9287599717182
1971-01-01	55.8591873060752
1971-04-01	60.2873640478065
1971-07-01	58.4467002140089
1971-10-01	56.8549390037684
1972-01-01	55.3100110252148
1972-04-01	58.2396017046460
1972-07-01	56.9586055796922
1972-10-01	54.4652929910848
1973-01-01	52.5022750651586
1973-04-01	56.2834444029286
1973-07-01	55.2486922336014
1973-10-01	52.3379775719970
1974-01-01	50.8314468692639
1974-04-01	53.9994364855574
1974-07-01	51.9265109200336
1974-10-01	49.8272896427287
1975-01-01	46.9434538325840
1975-04-01	49.4791441599346
1975-07-01	48.9121505788444
1975-10-01	48.6720743061725
1976-01-01	46.7910974265305
1976-04-01	47.6852360598060
1976-07-01	47.1366051273294
1976-10-01	44.9325706898596
1977-01-01	43.4463701300755
1977-04-01	44.8667255075022
1977-07-01	45.0853113890457
1977-10-01	42.9037493671640
1978-01-01	41.6990326748457
1978-04-01	45.8113797666306
1978-07-01	42.9147807704845
1978-10-01	41.8100840811546
1979-01-01	39.9753997539975
1979-04-01	44.5575636986680
1979-07-01	42.7527399390302
1979-10-01	41.5611507009784
1980-01-01	39.1812398172918
1980-04-01	42.7627320650117
1980-07-01	42.1567943618881
1980-10-01	41.1407766990291
1981-01-01	39.6431178882354
1981-04-01	43.5978805209851
1981-07-01	42.4472045944439
1981-10-01	40.8924596654658
1982-01-01	38.8871055644722
1982-04-01	43.4159956165978
1982-07-01	41.8943612989745
1982-10-01	41.7163645556957
1983-01-01	40.4557892839851
1983-04-01	44.0756547149630
1983-07-01	42.2532388793628
1983-10-01	41.3317957150720
1984-01-01	39.2348156364492
1984-04-01	43.1817444754971
1984-07-01	41.7288429827405
1984-10-01	41.1308656630515
1985-01-01	38.8182010492630
1985-04-01	42.2041846578476
1985-07-01	41.2847294170835
1985-10-01	40.3335232756191
1986-01-01	38.7079336374244
1986-04-01	42.2075989529808
1986-07-01	41.1497905941001
1986-10-01	40.1258930771126
1987-01-01	37.6692840287077
1987-04-01	41.6635044521424
1987-07-01	41.2161087173050
1987-10-01	39.8050205985636
1988-01-01	37.2289631027077
1988-04-01	42.3457249818822
1988-07-01	40.7548991286586
1988-10-01	40.1337181961162
1989-01-01	37.8284905518064
1989-04-01	42.2374389086178
1989-07-01	41.2192862052067
1989-10-01	40.8304715697976
1990-01-01	38.6507029783384
1990-04-01	43.3246352428053
1990-07-01	42.4495634831284
1990-10-01	42.2668800442139
1991-01-01	39.9980590264009
1991-04-01	44.8466441851886
1991-07-01	44.5996582649002
1991-10-01	43.4241506895392
1992-01-01	42.1165755166603
1992-04-01	45.6368212604316
1992-07-01	45.7024932916005
1992-10-01	44.9081738822586
1993-01-01	42.7936513246968
1993-04-01	46.3531015678255
1993-07-01	46.0913860317354
1993-10-01	46.0012260053244
1994-01-01	43.1119514575032
1994-04-01	46.7310666473346
1994-07-01	46.3563914253764
1994-10-01	45.3319108403367
1995-01-01	43.1450087103757
1995-04-01	46.1783000291211
1995-07-01	46.1021573955965
1995-10-01	44.9479798538831
1996-01-01	43.7028989275709
1996-04-01	46.7576124940224
1996-07-01	46.7477489298635
1996-10-01	45.7015440193067
1997-01-01	44.2773073920615
1997-04-01	47.3381242053954
1997-07-01	47.2370036907556
1997-10-01	45.5317998004811
1998-01-01	42.6746476610783
1998-04-01	46.0359252879859
1998-07-01	45.7308786129074
1998-10-01	45.0525953472916
1999-01-01	41.7004973786799
1999-04-01	44.2552740136864
1999-07-01	43.4514402352329
1999-10-01	42.6142861883714
2000-01-01	40.6778182619121
2000-04-01	44.3253208266587
2000-07-01	42.8731172981601
2000-10-01	42.4797432329971
2001-01-01	40.0493218249075
2001-04-01	43.5280352902580
2001-07-01	42.0057148794680
2001-10-01	41.1130537963074
2002-01-01	38.9694274382966
2002-04-01	42.1650934833908
2002-07-01	42.3504569545628
2002-10-01	40.3089804192657
2003-01-01	38.6941916999074
2003-04-01	41.2169697030488
2003-07-01	40.4294213033178
2003-10-01	39.8851166429629
2004-01-01	37.0722002650558
2004-04-01	40.0698129490548
2004-07-01	40.2511604291884
2004-10-01	40.3974597129872
2005-01-01	36.8848242674549
2005-04-01	40.3114807566862
2005-07-01	41.4937434329926
2005-10-01	41.6667520439830
2006-01-01	38.8342021811088
2006-04-01	41.5262060540444
2006-07-01	41.3572648822408
2006-10-01	40.8611246961611
2007-01-01	38.9299985200533
2007-04-01	43.5821599485859
2007-07-01	41.7832100900118
2007-10-01	40.8301051808180
2008-01-01	38.1113742189242
2008-04-01	42.9061827598136
2008-07-01	41.5067064865258
2008-10-01	40.7910180664638
2009-01-01	37.1011707927429
2009-04-01	40.4889321802133
2009-07-01	38.3419045715290
2009-10-01	37.0374059119352
2010-01-01	35.4020377908414
2010-04-01	38.3869321082185
2010-07-01	38.4777675852667
2010-10-01	37.6281959849389
2011-01-01	35.6752386054726
2011-04-01	40.3528727852696
2011-07-01	38.7286975045648
2011-10-01	37.1847288804988
2012-01-01	35.2812866976752
2012-04-01	39.1238206048934
2012-07-01	38.8359603060824
2012-10-01	37.9438261791203
2013-01-01	36.5422966565597
2013-04-01	40.1066666666667
2013-07-01	39.4460205567923
2013-10-01	38.1612613354186
2014-01-01	37.2794227702281
2014-04-01	40.2465166130761
2014-07-01	40.7100596424702
2014-10-01	38.9694041867955
2015-01-01	37.8625352795526
2015-04-01	40.6550309074853
2015-07-01	40.3760679952089
2015-10-01	40.8582775421864
2016-01-01	38.9070775151941
2016-04-01	43.7125178122414
2016-07-01	41.8628218869376
2016-10-01	42.6282051282051
2017-01-01	39.8085444999856
2017-04-01	44.0782278026663
2017-07-01	42.5683139832930
2017-10-01	41.9099504150085
2018-01-01	41.9320594479830
2018-04-01	46.4784911694579
2018-07-01	45.6520172619244