Quarter	Percent
1978-04-01	47.2950629775444
1978-07-01	46.6154464273668
1978-10-01	45.6626737996572
1979-01-01	45.0694245224860
1979-04-01	44.9129655527953
1979-07-01	44.8493978007348
1979-10-01	44.6701297325840
1980-01-01	44.4643968914228
1980-04-01	45.1002239263860
1980-07-01	45.3730371217032
1980-10-01	44.5774184989154
1981-01-01	43.6758380476597
1981-04-01	43.5357948332203
1981-07-01	44.4792760303951
1981-10-01	43.8926734552920
1982-01-01	43.0270316617030
1982-04-01	42.2603722932924
1982-07-01	41.8270445612806
1982-10-01	42.4580750330511
1983-01-01	42.0160231706290
1983-04-01	41.4147701052177
1983-07-01	41.5080504240517
1983-10-01	41.2113851605230
1984-01-01	41.4397513768137
1984-04-01	41.4719513527441
1984-07-01	41.0543591023877
1984-10-01	40.9883854295895
1985-01-01	40.4805671395554
1985-04-01	39.9803800599447
1985-07-01	40.6330020590706
1985-10-01	41.5662344122861
1986-01-01	41.3046423444887
1986-04-01	41.9195411542290
1986-07-01	41.3471544984554
1986-10-01	41.9766597994113
1987-01-01	41.9242835571331
1987-04-01	42.1362856229263
1987-07-01	41.4535162570324
1987-10-01	41.6997951401070
1988-01-01	41.9860142100436
1988-04-01	42.5006802560503
1988-07-01	42.2353257468351
1988-10-01	42.3207730239440
1989-01-01	42.6964054595451
1989-04-01	43.4096830775615
1989-07-01	43.2985980830995
1989-10-01	43.3057080765071
1990-01-01	42.2778727427638
1990-04-01	43.5250557433150
1990-07-01	44.7939862319576
1990-10-01	45.0051006184331
1991-01-01	43.8077755521644
1991-04-01	43.7893480081360
1991-07-01	43.0915587079692
1991-10-01	43.7752590804406
1992-01-01	43.4177526041258
1992-04-01	43.5357404746333
1992-07-01	43.8109711368869
1992-10-01	43.1287023449386
1993-01-01	42.7233056985044
1993-04-01	42.9565388955790
1993-07-01	43.3289498232182
1993-10-01	44.3413603899809
1994-01-01	44.3670300593763
1994-04-01	44.8439810760779
1994-07-01	44.6320052687224
1994-10-01	44.5934226605391
1995-01-01	44.2597897219949
1995-04-01	45.0569700215752
1995-07-01	45.1382154068585
1995-10-01	45.7181734003737
1996-01-01	45.5493046730348
1996-04-01	45.7429673713394
1996-07-01	45.9483157344042
1996-10-01	45.7759408967268
1997-01-01	45.7800502006468
1997-04-01	45.8454714521835
1997-07-01	45.8108065961807
1997-10-01	45.8304541292576
1998-01-01	45.4883741071706
1998-04-01	46.9284339628071
1998-07-01	47.2256753387497
1998-10-01	46.5526704479394
1999-01-01	45.6871483683298
1999-04-01	46.1189580778330
1999-07-01	47.0699704856629
1999-10-01	47.4621749425844
2000-01-01	47.2331913979676
2000-04-01	48.4222355643138
2000-07-01	48.9098601514728
2000-10-01	48.3863332863908
2001-01-01	47.7011321581116
2001-04-01	49.2576008552344
2001-07-01	49.1390574274912
2001-10-01	49.7390391655470
2002-01-01	50.2024410538860
2002-04-01	50.7331969598201
2002-07-01	50.3970135291705
2002-10-01	51.2380193900972
2003-01-01	51.6859166348038
2003-04-01	52.4273079965460
2003-07-01	52.4378972272553
2003-10-01	52.4611386444502
2004-01-01	52.1332361633553
2004-04-01	53.6915664910716
2004-07-01	54.3807067787907
2004-10-01	54.1948788511153
2005-01-01	54.1344958132242
2005-04-01	55.2487729571432
2005-07-01	55.8119051561242
2005-10-01	56.1464342743106
2006-01-01	56.1791147257063
2006-04-01	57.1969822591777
2006-07-01	58.0134432746289
2006-10-01	57.6640406205513
2007-01-01	57.4318784928212
2007-04-01	58.4754685414309
2007-07-01	58.3951729912412
2007-10-01	58.0840870953964
2008-01-01	57.4825883730907
2008-04-01	59.0196447068886
2008-07-01	59.5227632895263
2008-10-01	59.3639929688480
2009-01-01	60.3857425791595
2009-04-01	61.1281354306553
2009-07-01	60.9912976169102
2009-10-01	61.7148414988698
2010-01-01	61.8478920496688
2010-04-01	62.3619002052658
2010-07-01	63.0076381229488
2010-10-01	63.3431879736690
2011-01-01	62.7912191341707
2011-04-01	63.3584731655710
2011-07-01	63.6504807227297
2011-10-01	63.2519911956784
2012-01-01	62.8332631966768
2012-04-01	63.7279472501122
2012-07-01	64.0086886359270
2012-10-01	63.9388023447055
2013-01-01	63.6149697140356
2013-04-01	64.3711674123063
2013-07-01	63.8683949582973
2013-10-01	63.5105886379658
2014-01-01	63.3445640116776
2014-04-01	64.1718241312712
2014-07-01	64.5745448811745
2014-10-01	64.0544500337214
2015-01-01	63.9787336193926
2015-04-01	64.8773884210338
2015-07-01	64.8122562828154
2015-10-01	65.8189523110204
2016-01-01	65.6426218494547
2016-04-01	65.5714281657426
2016-07-01	64.6513006426292
2016-10-01	65.1000882014882
2017-01-01	65.1968841467317
2017-04-01	66.5668164748936
2017-07-01	66.5487916460580
2017-10-01	66.8136563649908
2018-01-01	66.3782288293264
2018-04-01	66.5125155116259
2018-07-01	66.8776436949980