Quarter	Percent
1960-01-01	49.7397849531938
1960-04-01	56.4749061657613
1960-07-01	56.8910183171182
1960-10-01	55.4018789868841
1961-01-01	50.8260832281407
1961-04-01	56.2245746036540
1961-07-01	55.6003402548699
1961-10-01	54.9302454716970
1962-01-01	49.6992577827330
1962-04-01	55.5476251876945
1962-07-01	54.9710542517993
1962-10-01	53.2605034634050
1963-01-01	48.2702947913622
1963-04-01	54.0995524070007
1963-07-01	53.6596269127477
1963-10-01	52.0383255422427
1964-01-01	48.0505913063613
1964-04-01	53.4898190392870
1964-07-01	52.4081874823118
1964-10-01	50.6104872398725
1965-01-01	47.2762728504223
1965-04-01	52.5481965297751
1965-07-01	52.2709550096576
1965-10-01	50.5882723633105
1966-01-01	47.6674678888421
1966-04-01	52.8947444520883
1966-07-01	52.4066844069113
1966-10-01	50.6547787598040
1967-01-01	47.7441623017992
1967-04-01	53.8144778346143
1967-07-01	52.3915743550816
1967-10-01	50.6788380808910
1968-01-01	47.4404877407912
1968-04-01	52.9661225140744
1968-07-01	52.1481320897702
1968-10-01	50.2396932210875
1969-01-01	47.2252915940087
1969-04-01	52.1391678680935
1969-07-01	51.5965136640868
1969-10-01	49.6072846791934
1970-01-01	47.1499135860296
1970-04-01	51.8514139858228
1970-07-01	51.3625543976797
1970-10-01	49.2273111913022
1971-01-01	46.9322782398886
1971-04-01	50.4795995278987
1971-07-01	49.8625847008358
1971-10-01	48.1755339334413
1972-01-01	45.7564018464280
1972-04-01	48.7255069062244
1972-07-01	48.6485997496907
1972-10-01	48.1693761439580
1973-01-01	46.8585818532127
1973-04-01	49.0380310500247
1973-07-01	49.0218934396191
1973-10-01	48.4837883237791
1974-01-01	45.1620972319390
1974-04-01	48.1065231914624
1974-07-01	47.3411050432511
1974-10-01	46.2049686510762
1975-01-01	43.6911759911913
1975-04-01	47.2271875914650
1975-07-01	47.1976195827985
1975-10-01	45.4660989893603
1976-01-01	43.8391630644924
1976-04-01	46.7435111335983
1976-07-01	47.2316670094330
1976-10-01	45.8916970766186
1977-01-01	44.1709921612759
1977-04-01	48.1355876969194
1977-07-01	48.0207635297595
1977-10-01	46.8809864026689
1978-01-01	45.0310180724297
1978-04-01	48.9366224877907
1978-07-01	48.4457972342434
1978-10-01	47.5524435342081
1979-01-01	45.6870107058887
1979-04-01	48.8525268652338
1979-07-01	48.8035720644935
1979-10-01	47.6414066540670
1980-01-01	45.4515243476940
1980-04-01	48.9567641699374
1980-07-01	49.1307444698387
1980-10-01	47.4660626546964
1981-01-01	45.4503584402989
1981-04-01	48.9457350082553
1981-07-01	48.6918250692906
1981-10-01	48.1575861153210
1982-01-01	46.2952975100288
1982-04-01	49.2244968814844
1982-07-01	48.7470433565003
1982-10-01	48.5404518339322
1983-01-01	47.3593642997168
1983-04-01	50.2680641589415
1983-07-01	50.0069774696893
1983-10-01	48.9751548404278
1984-01-01	46.8870636309041
1984-04-01	50.1638471166485
1984-07-01	50.0799479174627
1984-10-01	49.1399467238204
1985-01-01	47.3462790908746
1985-04-01	50.0101524748554
1985-07-01	49.8038119696994
1985-10-01	48.5064193063106
1986-01-01	47.2950680199911
1986-04-01	49.9283814020832
1986-07-01	49.6982690445744
1986-10-01	48.5447318489879
1987-01-01	47.0412367822330
1987-04-01	50.0100460818512
1987-07-01	49.5179060768312
1987-10-01	48.8729101900817
1988-01-01	47.4487178817557
1988-04-01	50.1589033343588
1988-07-01	49.8878911744679
1988-10-01	48.9000120158229
1989-01-01	47.8010823826272
1989-04-01	50.8021582860543
1989-07-01	50.4800907062458
1989-10-01	49.6876499643413
1990-01-01	48.7164992671594
1990-04-01	51.2941880172371
1990-07-01	51.0009880914949
1990-10-01	50.1734828840965
1991-01-01	49.1805579280795
1991-04-01	51.8081786894799
1991-07-01	51.5642039136602
1991-10-01	50.9144085040026
1992-01-01	49.4821224618878
1992-04-01	51.7581235554624
1992-07-01	51.2095484972457
1992-10-01	50.9357417440424
1993-01-01	48.8584661144394
1993-04-01	51.2859359585227
1993-07-01	50.9420856194856
1993-10-01	50.4745521286530
1994-01-01	49.0087035856336
1994-04-01	51.4467503631257
1994-07-01	50.5903052458925
1994-10-01	49.8914636506608
1995-01-01	48.8890117982792
1995-04-01	51.0378181398085
1995-07-01	50.6205064993338
1995-10-01	49.5658553369950
1996-01-01	48.6185861210947
1996-04-01	50.9701912947769
1996-07-01	50.8588095538331
1996-10-01	49.7977422518515
1997-01-01	49.0876652173785
1997-04-01	51.2573127888537
1997-07-01	51.0953028727077
1997-10-01	50.1455468335249
1998-01-01	49.2847249357566
1998-04-01	51.1098985443040
1998-07-01	50.6765127340524
1998-10-01	49.6439623575023
1999-01-01	48.5817882968491
1999-04-01	50.5927437039527
1999-07-01	50.2763630254168
1999-10-01	49.2982072303246
2000-01-01	48.2060506761400
2000-04-01	50.1285307567839
2000-07-01	49.7431397868040
2000-10-01	49.3444462387565
2001-01-01	48.6383258002870
2001-04-01	49.7916219684189
2001-07-01	49.3674250850942
2001-10-01	49.0695651391583
2002-01-01	47.9033905020453
2002-04-01	49.0252666439779
2002-07-01	48.8516819907476
2002-10-01	48.4596855752879
2003-01-01	47.5046127715494
2003-04-01	49.0405639285120
2003-07-01	48.7973896292450
2003-10-01	48.1524962162678
2004-01-01	47.4883725904948
2004-04-01	48.7594404437377
2004-07-01	48.9788859645614
2004-10-01	47.9722696696099
2005-01-01	47.3891211546670
2005-04-01	49.0603078265707
2005-07-01	49.0258417826606
2005-10-01	48.1912148406746
2006-01-01	47.5031553325774
2006-04-01	48.8929490320138
2006-07-01	48.9904275122754
2006-10-01	48.5764017210442
2007-01-01	47.4744274869164
2007-04-01	49.1300929388340
2007-07-01	48.6988034042225
2007-10-01	48.5832932535209
2008-01-01	47.5868122439612
2008-04-01	49.1611079816566
2008-07-01	48.6233157425601
2008-10-01	48.2599838774496
2009-01-01	47.8815015141125
2009-04-01	48.9414915030891
2009-07-01	48.9832782631762
2009-10-01	48.2694256952058
2010-01-01	47.7805758979509
2010-04-01	48.7869174546014
2010-07-01	48.8073779940571
2010-10-01	48.4433545151318
2011-01-01	47.8056886134374
2011-04-01	48.4384816604412
2011-07-01	48.2800972353427
2011-10-01	48.1853227152296
2012-01-01	47.5464097523059
2012-04-01	48.5552047833340
2012-07-01	48.3874676220948
2012-10-01	48.2832449732126
2013-01-01	48.1686082168606
2013-04-01	49.0944194759018
2013-07-01	48.9698067099220
2013-10-01	49.4257641506609
2014-01-01	48.5052711684592
2014-04-01	49.5471576700714
2014-07-01	49.4950970077538
2014-10-01	49.6808132275680
2015-01-01	48.9781672919898
2015-04-01	49.8402853809593
2015-07-01	49.9767105431494
2015-10-01	49.8171818492436
2016-01-01	49.6399899332022
2016-04-01	50.4121080137099
2016-07-01	50.8533500933560
2016-10-01	50.5572162963970
2017-01-01	50.1161207521304
2017-04-01	51.3797158040796
2017-07-01	51.6602679260294
2017-10-01	51.4982266789956
2018-01-01	51.7877171945636
2018-04-01	52.7138769618799
2018-07-01	52.9093750732617