Quarter	Percent
1968-01-01	48.9635582495706
1968-04-01	55.5260236927610
1968-07-01	54.3408576690165
1968-10-01	50.9747675314389
1969-01-01	48.7172308840842
1969-04-01	54.2713941890182
1969-07-01	54.0918316997840
1969-10-01	50.6960837030532
1970-01-01	49.5752287349664
1970-04-01	54.3078254102297
1970-07-01	54.1800557307045
1970-10-01	52.0081927886932
1971-01-01	50.4671486706989
1971-04-01	54.5031409135278
1971-07-01	52.8013391293085
1971-10-01	49.7955139215844
1972-01-01	49.0598577756783
1972-04-01	50.8738117686816
1972-07-01	49.9283470871846
1972-10-01	49.2094622961922
1973-01-01	48.5764365809441
1973-04-01	50.2897010187482
1973-07-01	49.7266969383752
1973-10-01	48.2080767581678
1974-01-01	44.1617223392378
1974-04-01	47.8867163759631
1974-07-01	46.6968719133036
1974-10-01	45.5923606399553
1975-01-01	42.8143928885265
1975-04-01	46.3932762925768
1975-07-01	45.3819377038822
1975-10-01	43.5383378298234
1976-01-01	41.9900970595246
1976-04-01	43.9402434658273
1976-07-01	43.9648033023429
1976-10-01	42.5090847018909
1977-01-01	41.3246618482192
1977-04-01	45.4957663565414
1977-07-01	44.2142556896655
1977-10-01	42.7855891469386
1978-01-01	40.8847216369340
1978-04-01	45.1286359732646
1978-07-01	44.4857220828674
1978-10-01	42.2409679041930
1979-01-01	40.8320232519192
1979-04-01	44.3596268023749
1979-07-01	44.5905792990929
1979-10-01	41.6677312420128
1980-01-01	38.9474508787000
1980-04-01	43.7144257470761
1980-07-01	45.4671306362605
1980-10-01	42.1614489624565
1981-01-01	39.7639590009454
1981-04-01	44.4212616374903
1981-07-01	43.6917648869461
1981-10-01	41.2718641500025
1982-01-01	38.9877241968809
1982-04-01	43.0552329494255
1982-07-01	42.7467865006323
1982-10-01	41.8750434896513
1983-01-01	40.1822638576260
1983-04-01	44.6518388464998
1983-07-01	43.4597507114887
1983-10-01	41.9062399397448
1984-01-01	39.0636335463231
1984-04-01	43.8491177322983
1984-07-01	44.0788160237976
1984-10-01	41.8526710344105
1985-01-01	40.1779444934785
1985-04-01	42.3740987936934
1985-07-01	42.0082128593417
1985-10-01	40.8983115293332
1986-01-01	40.2846988465090
1986-04-01	42.6427110743475
1986-07-01	42.6768432504135
1986-10-01	40.8759791905253
1987-01-01	38.5645806960082
1987-04-01	42.6429130224998
1987-07-01	42.0289212491122
1987-10-01	41.0186296740919
1988-01-01	38.8981800097405
1988-04-01	42.6854460931789
1988-07-01	42.3326478106118
1988-10-01	41.2636473717460
1989-01-01	39.6010094204408
1989-04-01	44.3497304688043
1989-07-01	43.3156791160397
1989-10-01	41.9179320017518
1990-01-01	40.0059917553446
1990-04-01	44.6897139842787
1990-07-01	44.1794475280344
1990-10-01	43.5142807462291
1991-01-01	40.8742232456256
1991-04-01	46.2690803499718
1991-07-01	44.7593507437141
1991-10-01	44.1854826811156
1992-01-01	42.1890096502702
1992-04-01	47.0933500308251
1992-07-01	45.1147498026635
1992-10-01	44.1041168055033
1993-01-01	41.4449393235330
1993-04-01	46.1044103734166
1993-07-01	45.3211724172521
1993-10-01	44.3368361311262
1994-01-01	42.3683311609013
1994-04-01	46.2928942494679
1994-07-01	45.4054660049912
1994-10-01	44.8734322170124
1995-01-01	42.7683423576487
1995-04-01	45.6850131219573
1995-07-01	44.9259259259259
1995-10-01	44.5515961395694
1996-01-01	42.4041379924897
1996-04-01	46.3995632302719
1996-07-01	45.9653227857990
1996-10-01	43.3836459008369
1997-01-01	42.3043687645354
1997-04-01	45.6862249697945
1997-07-01	46.1093195190106
1997-10-01	44.2015421802560
1998-01-01	42.8731223033977
1998-04-01	45.8828026037671
1998-07-01	45.1521434038764
1998-10-01	43.3987891536435
1999-01-01	41.5605716533302
1999-04-01	45.1988139322203
1999-07-01	43.4109362627574
1999-10-01	42.0094344784001
2000-01-01	41.2256354457642
2000-04-01	44.0419196838753
2000-07-01	43.5982854188930
2000-10-01	43.5578289286729
2001-01-01	41.3544728719826
2001-04-01	43.7956484375912
2001-07-01	42.7450009115833
2001-10-01	41.9992161744703
2002-01-01	39.0742822608452
2002-04-01	42.2224219668525
2002-07-01	42.0485082998900
2002-10-01	40.9375729023242
2003-01-01	38.2613156486053
2003-04-01	41.5687301943758
2003-07-01	42.1273792430638
2003-10-01	40.6560352054450
2004-01-01	38.7517821471385
2004-04-01	41.5981632332384
2004-07-01	42.2837382280525
2004-10-01	40.5594275516942
2005-01-01	39.6367541160205
2005-04-01	43.4327624852319
2005-07-01	42.6430423825114
2005-10-01	41.2616957081836
2006-01-01	40.2051914527943
2006-04-01	43.4962667060560
2006-07-01	42.7070690418527
2006-10-01	41.7566927268420
2007-01-01	39.5679085496200
2007-04-01	44.0298247060287
2007-07-01	41.4475909796757
2007-10-01	40.9070040696905
2008-01-01	40.2664778983797
2008-04-01	44.3125441257847
2008-07-01	41.0579825641769
2008-10-01	40.9165366614665
2009-01-01	38.7225886133777
2009-04-01	43.0148007063072
2009-07-01	41.1939271470172
2009-10-01	40.5528453639317
2010-01-01	38.4612621585655
2010-04-01	41.0503751339764
2010-07-01	40.2263635097544
2010-10-01	40.6740300332390
2011-01-01	39.3384906937535
2011-04-01	42.5293741657737
2011-07-01	40.4743805504635
2011-10-01	38.8001527425470
2012-01-01	36.1130984197470
2012-04-01	39.8447959537859
2012-07-01	40.6768180140273
2012-10-01	38.9538119087368
2013-01-01	38.1700892409146
2013-04-01	41.6202001806197
2013-07-01	41.3209726489828
2013-10-01	41.1105452281923
2014-01-01	38.9772348105681
2014-04-01	42.1022899592321
2014-07-01	41.6330206992845
2014-10-01	40.6891508216467
2015-01-01	37.5491123920961
2015-04-01	42.5830825232873
2015-07-01	41.2325608209385
2015-10-01	41.3886260001721
2016-01-01	40.6442020853117
2016-04-01	42.9777999198545
2016-07-01	44.0180867437170
2016-10-01	42.6873918571415
2017-01-01	40.7983341689075
2017-04-01	43.8205362601090
2017-07-01	44.6883955983169
2017-10-01	42.7531829443016
2018-01-01	44.8256118681920
2018-04-01	47.5599128540305
2018-07-01	47.8078458948412