Quarter	Percent
1968-01-01	39.8786985805688
1968-04-01	47.3464691500072
1968-07-01	48.2560799883387
1968-10-01	44.7234211788375
1969-01-01	41.1107668888812
1969-04-01	47.7871763631455
1969-07-01	46.9748214071440
1969-10-01	43.6064114630071
1970-01-01	40.6785810163119
1970-04-01	47.1204336387874
1970-07-01	46.9116195073565
1970-10-01	42.9260137362968
1971-01-01	39.9804060187005
1971-04-01	47.3563749511736
1971-07-01	47.2666295757880
1971-10-01	45.0768737054001
1972-01-01	39.1918510554031
1972-04-01	45.4404720853315
1972-07-01	45.9207820379187
1972-10-01	43.9044926461500
1973-01-01	41.5528409507014
1973-04-01	45.2220149867964
1973-07-01	45.9424756034926
1973-10-01	45.4248103644630
1974-01-01	40.8421052631579
1974-04-01	45.7282913165266
1974-07-01	45.3919081145499
1974-10-01	42.9201193123427
1975-01-01	39.9696829153807
1975-04-01	45.6270021004278
1975-07-01	46.2335511920729
1975-10-01	42.7266875278555
1976-01-01	40.1743796109993
1976-04-01	45.6719893546241
1976-07-01	46.9489765804507
1976-10-01	43.8007278988768
1977-01-01	40.1144192913386
1977-04-01	46.0976841699155
1977-07-01	47.0617766176535
1977-10-01	44.9596016648040
1978-01-01	41.3626873843838
1978-04-01	47.4630902935605
1978-07-01	47.6358540283889
1978-10-01	45.3300152452695
1979-01-01	42.0014905108322
1979-04-01	47.4938636037946
1979-07-01	47.7219762955485
1979-10-01	45.0789104162013
1980-01-01	41.8591703654995
1980-04-01	48.0788342299134
1980-07-01	48.1224949857733
1980-10-01	44.0272431426879
1981-01-01	40.9471077720117
1981-04-01	46.8085511672610
1981-07-01	46.9468697770686
1981-10-01	44.6181246964227
1982-01-01	41.9166308300691
1982-04-01	47.5319846919720
1982-07-01	46.5152640867394
1982-10-01	44.5513091673951
1983-01-01	43.3703876865801
1983-04-01	47.7170218595779
1983-07-01	48.1157478302572
1983-10-01	45.7679082216664
1984-01-01	42.0707320440970
1984-04-01	47.1251080256041
1984-07-01	46.6834770728676
1984-10-01	44.7393895964752
1985-01-01	42.4157477102195
1985-04-01	48.0094182097897
1985-07-01	47.1065027560005
1985-10-01	44.2729054321367
1986-01-01	41.5679163374031
1986-04-01	46.0577637444279
1986-07-01	46.6269686708148
1986-10-01	45.0290045321609
1987-01-01	42.1602859217039
1987-04-01	46.3741287430847
1987-07-01	46.5672137614584
1987-10-01	45.6216184547386
1988-01-01	43.0590134277986
1988-04-01	46.5689239012228
1988-07-01	46.8152799443352
1988-10-01	44.9473896680601
1989-01-01	43.5516520763057
1989-04-01	47.2832136173822
1989-07-01	47.4334411576502
1989-10-01	46.2979874852021
1990-01-01	44.3869574452374
1990-04-01	48.8464900251573
1990-07-01	48.9432931467042
1990-10-01	47.0938193663697
1991-01-01	45.8736406619385
1991-04-01	49.9550255253206
1991-07-01	50.7284184987213
1991-10-01	48.1508849099986
1992-01-01	46.9810496794870
1992-04-01	48.8672737153665
1992-07-01	50.0431212339004
1992-10-01	48.5990342594701
1993-01-01	47.1062873376498
1993-04-01	49.8930252460419
1993-07-01	49.9358151476252
1993-10-01	47.9857368721874
1994-01-01	46.5555743965379
1994-04-01	49.4425751495160
1994-07-01	49.1864963755628
1994-10-01	47.4583866837388
1995-01-01	46.8710089399744
1995-04-01	49.9365761279958
1995-07-01	49.7034620502549
1995-10-01	47.8923757247942
1996-01-01	45.9277917716205
1996-04-01	49.7061308266883
1996-07-01	50.2916675120480
1996-10-01	49.0507446267015
1997-01-01	47.2993573607071
1997-04-01	50.1017991856065
1997-07-01	50.8344995555714
1997-10-01	49.7972424979724
1998-01-01	48.1586232388412
1998-04-01	50.6470040207904
1998-07-01	51.3652720370661
1998-10-01	49.5019085478503
1999-01-01	48.2699958086683
1999-04-01	50.8311663536846
1999-07-01	51.2800008931537
1999-10-01	49.6462264150943
2000-01-01	48.3016894098288
2000-04-01	50.2768829445728
2000-07-01	50.6338832944154
2000-10-01	49.6001877453490
2001-01-01	48.5527552689990
2001-04-01	49.4132092313621
2001-07-01	49.5970825794705
2001-10-01	48.8617485228092
2002-01-01	48.3319144105795
2002-04-01	48.8708183724890
2002-07-01	49.8063459972190
2002-10-01	48.7421313884459
2003-01-01	48.7133998548584
2003-04-01	49.3911719723228
2003-07-01	49.9994943001644
2003-10-01	49.7607220820386
2004-01-01	48.8433428964645
2004-04-01	50.4357318233499
2004-07-01	51.0216887036549
2004-10-01	50.3557831719220
2005-01-01	49.7711345643477
2005-04-01	51.0547046238457
2005-07-01	51.8010391797666
2005-10-01	50.6621182245190
2006-01-01	50.2261113889606
2006-04-01	51.6676080407832
2006-07-01	51.9264510348017
2006-10-01	52.1920682844339
2007-01-01	51.3869749041445
2007-04-01	52.4416580491347
2007-07-01	53.2386808087743
2007-10-01	53.2247968772422
2008-01-01	52.0128083721360
2008-04-01	54.1188738269030
2008-07-01	53.8944736867434
2008-10-01	52.9329981962601
2009-01-01	52.8607440815832
2009-04-01	53.8626232986370
2009-07-01	54.3755791707769
2009-10-01	53.4440510212029
2010-01-01	53.4203634691416
2010-04-01	53.8731783838731
2010-07-01	54.7783661534312
2010-10-01	54.1219093260953
2011-01-01	54.1115861343394
2011-04-01	55.0585390503484
2011-07-01	54.3476250995465
2011-10-01	54.2368509810924
2012-01-01	54.1150631847966
2012-04-01	53.8545245740629
2012-07-01	53.8953244205327
2012-10-01	54.5327551278403
2013-01-01	55.5163421650462
2013-04-01	55.0578288642414
2013-07-01	56.0414863004345
2013-10-01	56.7673337503998
2014-01-01	56.4772694049628
2014-04-01	57.7116474526329
2014-07-01	57.7048846468926
2014-10-01	58.1765726051143
2015-01-01	58.7361633542981
2015-04-01	58.7427108513602
2015-07-01	59.9517716170633
2015-10-01	60.0497100095183
2016-01-01	60.5497254885588
2016-04-01	60.3014659005594
2016-07-01	61.7856400897167
2016-10-01	61.6915839156815
2017-01-01	62.4677186544454
2017-04-01	62.8744534528596
2017-07-01	64.2223183957210
2017-10-01	63.9259814953738
2018-01-01	64.9936609518396
2018-04-01	65.1645753466300
2018-07-01	66.4062500000000