Quarter	Percent
1960-01-01	34.1449564871734
1960-04-01	29.2058980627507
1960-07-01	29.1877821610352
1960-10-01	30.2686734354254
1961-01-01	33.4456859305698
1961-04-01	29.3986972869990
1961-07-01	29.8317310739530
1961-10-01	30.6231847686573
1962-01-01	34.2119261103844
1962-04-01	29.9339591192218
1962-07-01	30.5619006531194
1962-10-01	31.9524014021268
1963-01-01	35.7721263418338
1963-04-01	31.2692538558828
1963-07-01	31.6862333777699
1963-10-01	32.9438084091489
1964-01-01	36.1309597222064
1964-04-01	32.1188041905477
1964-07-01	32.9296517150110
1964-10-01	34.1614095702427
1965-01-01	36.8156424372241
1965-04-01	32.8307305523435
1965-07-01	33.1080292352918
1965-10-01	34.3748648840459
1966-01-01	36.4925345755663
1966-04-01	32.5560989193637
1966-07-01	33.1284007932498
1966-10-01	34.4632012638094
1967-01-01	36.6493119823980
1967-04-01	32.1698265781940
1967-07-01	32.9140436048818
1967-10-01	34.3978670155760
1968-01-01	36.4551869947449
1968-04-01	32.4252395811737
1968-07-01	32.9036557146728
1968-10-01	34.2737141024589
1969-01-01	36.5770124723574
1969-04-01	32.8925271072716
1969-07-01	33.3403819615770
1969-10-01	34.8431145722652
1970-01-01	36.5166512781224
1970-04-01	33.2050341703760
1970-07-01	33.5174853935105
1970-10-01	35.0520503845540
1971-01-01	36.3389079627129
1971-04-01	33.6267959455801
1971-07-01	34.2515983780279
1971-10-01	35.4131250320480
1972-01-01	36.9197523967571
1972-04-01	34.6008540272677
1972-07-01	34.7848690761796
1972-10-01	35.5724383683915
1973-01-01	36.4159039670508
1973-04-01	34.5480098391832
1973-07-01	34.6208580934385
1973-10-01	35.2109194484103
1974-01-01	37.3074213994335
1974-04-01	35.1022567686720
1974-07-01	35.7064581850742
1974-10-01	36.5149907685057
1975-01-01	38.3653560817409
1975-04-01	35.9443955014202
1975-07-01	35.9633555017490
1975-10-01	36.8219588742711
1976-01-01	38.1240217917722
1976-04-01	36.2328351086582
1976-07-01	36.0912108348096
1976-10-01	36.9616569697952
1977-01-01	38.3272346536170
1977-04-01	35.7891605414337
1977-07-01	35.8633858148291
1977-10-01	36.7281679970427
1978-01-01	38.0400794727714
1978-04-01	35.3140076585000
1978-07-01	35.8403419538615
1978-10-01	36.5150905260615
1979-01-01	37.9283173914293
1979-04-01	35.4723638554716
1979-07-01	35.5898477468117
1979-10-01	36.5178642153996
1980-01-01	38.1039539743776
1980-04-01	35.6613000177436
1980-07-01	35.6298472296133
1980-10-01	36.6597796656204
1981-01-01	37.9130616672721
1981-04-01	35.5796533994149
1981-07-01	35.9002140033926
1981-10-01	36.5641322273723
1982-01-01	37.8088478175096
1982-04-01	35.5496345352689
1982-07-01	36.0718030649806
1982-10-01	36.3041664067051
1983-01-01	37.1677723684822
1983-04-01	34.9969415403773
1983-07-01	35.4072597087714
1983-10-01	36.2318172607463
1984-01-01	37.7051567303273
1984-04-01	35.4026541585468
1984-07-01	35.6100657391570
1984-10-01	36.3537231317539
1985-01-01	37.7198408434820
1985-04-01	35.8023288580650
1985-07-01	36.0777662181449
1985-10-01	37.0083330442200
1986-01-01	38.0436853380373
1986-04-01	36.0208846800931
1986-07-01	36.1919732614037
1986-10-01	37.1448029217264
1987-01-01	38.3988412728447
1987-04-01	36.2229801034886
1987-07-01	36.5193773680922
1987-10-01	37.1625257544310
1988-01-01	38.3375800315048
1988-04-01	36.2371247338081
1988-07-01	36.4864473954070
1988-10-01	37.2847626308507
1989-01-01	38.2798741168310
1989-04-01	35.9781322464516
1989-07-01	36.2294736494370
1989-10-01	36.8241462820709
1990-01-01	37.7570559948460
1990-04-01	35.6973180113630
1990-07-01	35.8943192324031
1990-10-01	36.3574913499001
1991-01-01	37.2350307492851
1991-04-01	35.2284629352588
1991-07-01	35.4015610057116
1991-10-01	35.8858673658672
1992-01-01	36.8642407429889
1992-04-01	35.2595501869635
1992-07-01	35.5772970411475
1992-10-01	35.7742618075528
1993-01-01	37.2914267490722
1993-04-01	35.4693004022255
1993-07-01	35.6875197220110
1993-10-01	36.0205602772563
1994-01-01	37.2991555823788
1994-04-01	35.4898879626191
1994-07-01	35.9254423390199
1994-10-01	36.5886202726532
1995-01-01	37.5601041375702
1995-04-01	35.8873783200716
1995-07-01	35.9001111414011
1995-10-01	36.7616177556659
1996-01-01	37.6898472573129
1996-04-01	35.8318485081122
1996-07-01	35.7637529711759
1996-10-01	36.5783865961594
1997-01-01	37.2193188218488
1997-04-01	35.5186285489691
1997-07-01	35.7858668549171
1997-10-01	36.5680681717686
1998-01-01	37.3598560405951
1998-04-01	35.8600528484189
1998-07-01	36.2666435616396
1998-10-01	36.9880135246398
1999-01-01	37.8422049817625
1999-04-01	36.3941326600013
1999-07-01	36.6468789877267
1999-10-01	37.2949735260051
2000-01-01	38.3106129736470
2000-04-01	36.9922330369581
2000-07-01	37.2185958658868
2000-10-01	37.4122813067626
2001-01-01	38.3574276017655
2001-04-01	37.4318304243361
2001-07-01	37.7648985403821
2001-10-01	38.1502978285705
2002-01-01	39.2028692201432
2002-04-01	38.3478576699703
2002-07-01	38.4375333852662
2002-10-01	38.9470476011976
2003-01-01	39.7764281939275
2003-04-01	38.5102414377517
2003-07-01	38.8435552510667
2003-10-01	39.3781503590859
2004-01-01	40.1448151054589
2004-04-01	39.0474162590249
2004-07-01	39.0147222121434
2004-10-01	39.7700464974378
2005-01-01	40.3531124863487
2005-04-01	39.0369805339255
2005-07-01	39.0532573209092
2005-10-01	39.6355164720533
2006-01-01	40.3064776238853
2006-04-01	39.1517836149836
2006-07-01	39.1606912387978
2006-10-01	39.5428140997907
2007-01-01	40.2940548186267
2007-04-01	38.9659484656883
2007-07-01	39.3618922778080
2007-10-01	39.6182568601923
2008-01-01	40.3931384579020
2008-04-01	39.1057322626433
2008-07-01	39.6198483116313
2008-10-01	39.9627435546843
2009-01-01	40.4612346564020
2009-04-01	39.6051794712829
2009-07-01	39.8030023474266
2009-10-01	40.4047123361732
2010-01-01	40.7636799492398
2010-04-01	39.9129176685621
2010-07-01	40.0024184494016
2010-10-01	40.4414743689778
2011-01-01	40.8991400427522
2011-04-01	40.3136389586649
2011-07-01	40.6098354005117
2011-10-01	40.7851783097798
2012-01-01	41.3033535183578
2012-04-01	40.5403729839167
2012-07-01	40.7639768705163
2012-10-01	40.9728582334652
2013-01-01	41.1676226941870
2013-04-01	40.3555596706617
2013-07-01	40.5199718225745
2013-10-01	40.4393453818764
2014-01-01	41.0828135298741
2014-04-01	40.1483939253169
2014-07-01	40.2611731564103
2014-10-01	40.4207472561069
2015-01-01	40.8083563657334
2015-04-01	40.1681913598940
2015-07-01	40.0943221706268
2015-10-01	40.2911199917264
2016-01-01	40.5481999085614
2016-04-01	39.7629234808675
2016-07-01	39.5569410714883
2016-10-01	39.7635339336811
2017-01-01	40.2402456486202
2017-04-01	39.2395368930249
2017-07-01	39.0550082130240
2017-10-01	39.3317611311573
2018-01-01	39.1145750645091
2018-04-01	38.2169911953751
2018-07-01	38.2125834882035