Quarter	Percent
1968-01-01	51.4463260260780
1968-04-01	57.5701242075934
1968-07-01	56.5670550969635
1968-10-01	53.8181456898404
1969-01-01	51.0391576282231
1969-04-01	56.2091886831519
1969-07-01	55.7477723960112
1969-10-01	53.1250000000000
1970-01-01	51.6357076836308
1970-04-01	56.4793255507295
1970-07-01	56.0672449884430
1970-10-01	53.9730974173253
1971-01-01	53.2112206925316
1971-04-01	57.4474604748526
1971-07-01	55.6530602311672
1971-10-01	53.3474469466777
1972-01-01	52.1351189331897
1972-04-01	54.5248093198247
1972-07-01	53.4346334537378
1972-10-01	51.8243279276459
1973-01-01	50.5158224841355
1973-04-01	53.2536461089162
1973-07-01	52.4985911278313
1973-10-01	50.2711748305282
1974-01-01	47.4673744588693
1974-04-01	51.0003888782776
1974-07-01	49.2808581575171
1974-10-01	47.6685599405522
1975-01-01	44.8445166650804
1975-04-01	47.9733227292130
1975-07-01	47.2303679488284
1975-10-01	46.1108676917211
1976-01-01	44.4355738249970
1976-04-01	45.8029578175330
1976-07-01	45.5573665179964
1976-10-01	43.7820013986484
1977-01-01	42.3830363467522
1977-04-01	45.1570781312238
1977-07-01	44.6877161729271
1977-10-01	42.9049002349002
1978-01-01	41.3357309235942
1978-04-01	45.4638681624590
1978-07-01	43.7185634820687
1978-10-01	42.0428514149960
1979-01-01	40.3879849812265
1979-04-01	44.4719302893557
1979-07-01	43.6434229726913
1979-10-01	41.6014751454590
1980-01-01	39.0505457930808
1980-04-01	43.2502619258734
1980-07-01	43.8087457645797
1980-10-01	41.6239367712210
1981-01-01	39.7023774481721
1981-04-01	43.9989924490804
1981-07-01	43.0572883889959
1981-10-01	41.0990464616413
1982-01-01	38.9569984092751
1982-04-01	43.2892332615670
1982-07-01	42.3207239301261
1982-10-01	41.8026649644297
1983-01-01	40.3093190902394
1983-04-01	44.3696982923802
1983-07-01	42.8931355948822
1983-10-01	41.6415673309700
1984-01-01	39.1588111826086
1984-04-01	43.4596860595183
1984-07-01	42.8578287793092
1984-10-01	41.4723941842732
1985-01-01	39.4944683969465
1985-04-01	42.2591791581797
1985-07-01	41.6101750492353
1985-10-01	40.6013712129017
1986-01-01	39.4737049082440
1986-04-01	42.4006488343594
1986-07-01	41.9061757731730
1986-10-01	40.4843116978272
1987-01-01	38.1220538197287
1987-04-01	42.1227268721192
1987-07-01	41.6130804568981
1987-10-01	40.3946348023697
1988-01-01	38.0143296107781
1988-04-01	42.5301035202474
1988-07-01	41.5463714081372
1988-10-01	40.6599872648635
1989-01-01	38.6683911472149
1989-04-01	43.2581397793301
1989-07-01	42.2060256783297
1989-10-01	41.3860107149403
1990-01-01	39.3176356166880
1990-04-01	43.9979892102867
1990-07-01	43.3079138108607
1990-10-01	42.8746499434383
1991-01-01	40.4356071118490
1991-04-01	45.5499163037814
1991-07-01	44.7004904714086
1991-10-01	43.7704876995338
1992-01-01	42.1518746020082
1992-04-01	46.3824775438648
1992-07-01	45.4412679496319
1992-10-01	44.5409644353447
1993-01-01	42.1360213770088
1993-04-01	46.2236078319986
1993-07-01	45.7066428292001
1993-10-01	45.2063511658598
1994-01-01	42.7820542566346
1994-04-01	46.5256378714563
1994-07-01	45.8749707626089
1994-10-01	45.0826320894616
1995-01-01	42.9460858652442
1995-04-01	45.9201883395850
1995-07-01	45.4774774774775
1995-10-01	44.7631160942950
1996-01-01	43.0786007704874
1996-04-01	46.6185866955159
1996-07-01	46.3833764171219
1996-10-01	44.5723785094240
1997-01-01	43.3068372954615
1997-04-01	46.5507328502037
1997-07-01	46.6677551713515
1997-10-01	44.9291587783909
1998-01-01	42.7905909862012
1998-04-01	45.9699609000764
1998-07-01	45.4218719916573
1998-10-01	44.2088979680287
1999-01-01	41.6408540955997
1999-04-01	44.7154821923431
1999-07-01	43.4316782081985
1999-10-01	42.3104616220239
2000-01-01	40.9243523627897
2000-04-01	44.2162530899503
2000-07-01	43.2061920274628
2000-10-01	42.9757821313530
2001-01-01	40.6646062169253
2001-04-01	43.6770563754469
2001-07-01	42.3756838852133
2001-10-01	41.5153052673299
2002-01-01	39.0417995214334
2002-04-01	42.1747123130850
2002-07-01	42.2344499609873
2002-10-01	40.6375788763823
2003-01-01	38.5090026146582
2003-04-01	41.3850680836013
2003-07-01	41.2608962061336
2003-10-01	40.2798292166647
2004-01-01	37.8913151533877
2004-04-01	40.7747248596104
2004-07-01	41.2519426730687
2004-10-01	40.4440213993346
2005-01-01	38.2315190956143
2005-04-01	41.8644936275048
2005-07-01	42.0915545032280
2005-10-01	41.4509832528086
2006-01-01	39.4645299976645
2006-04-01	42.5357493827252
2006-07-01	42.0145068243244
2006-10-01	41.2979449165545
2007-01-01	39.2502555058331
2007-04-01	43.8279748649720
2007-07-01	41.6303792309316
2007-10-01	40.8534350906112
2008-01-01	39.1618990730870
2008-04-01	43.5911368473935
2008-07-01	41.3138347107219
2008-10-01	40.8628441246296
2009-01-01	37.8949607651545
2009-04-01	41.7113033037004
2009-07-01	39.7676498472098
2009-10-01	38.7880285121792
2010-01-01	36.9326600698516
2010-04-01	39.6804827397819
2010-07-01	39.4044060117285
2010-10-01	39.1481189748187
2011-01-01	37.3876480048504
2011-04-01	41.3345193976155
2011-07-01	39.5248437329791
2011-10-01	37.9967759278507
2012-01-01	35.7316553959634
2012-04-01	39.4545021074067
2012-07-01	39.7558456672595
2012-10-01	38.4023808218166
2013-01-01	37.2581697028548
2013-04-01	40.8819527811124
2013-07-01	40.3227500735351
2013-10-01	39.5730883171393
2014-01-01	38.0868261403566
2014-04-01	41.1360374957910
2014-07-01	41.1427971953376
2014-10-01	39.8075625068700
2015-01-01	37.6754577388551
2015-04-01	41.5887760897807
2015-07-01	40.7599361346496
2015-10-01	41.1716811937487
2016-01-01	39.7413466146135
2016-04-01	43.3825050299052
2016-07-01	42.9238220279715
2016-10-01	42.6728406361087
2017-01-01	40.3166078943354
2017-04-01	43.9529516613577
2017-07-01	43.6216730420692
2017-10-01	42.3622890559792
2018-01-01	43.3487511356364
2018-04-01	47.0166702821766
2018-07-01	46.6861660604249