Quarter	Percent
1978-04-01	45.7205046793959
1978-07-01	44.9929385728238
1978-10-01	44.1663038596980
1979-01-01	43.4544371948863
1979-04-01	43.4198697298926
1979-07-01	43.4776867547244
1979-10-01	43.3916916953474
1980-01-01	43.2363810592530
1980-04-01	43.8589887037901
1980-07-01	44.0061962777821
1980-10-01	43.2548342472640
1981-01-01	42.4127752125409
1981-04-01	42.1642328966089
1981-07-01	42.9228278571467
1981-10-01	42.5444735041198
1982-01-01	41.6704177829993
1982-04-01	40.9794817672127
1982-07-01	40.3840776988248
1982-10-01	40.5160703175114
1983-01-01	39.6841261456423
1983-04-01	38.8091822710711
1983-07-01	38.9457270239315
1983-10-01	38.8833148821409
1984-01-01	38.9022046313454
1984-04-01	39.1706218231065
1984-07-01	38.8207862557400
1984-10-01	38.8411905637350
1985-01-01	38.0748624170110
1985-04-01	37.3536604230258
1985-07-01	38.0175165602588
1985-10-01	39.1876162338703
1986-01-01	39.1617108617094
1986-04-01	39.7685721633956
1986-07-01	39.0775690277834
1986-10-01	39.4611632604030
1987-01-01	39.4109879416750
1987-04-01	39.6750000750438
1987-07-01	39.1773069337012
1987-10-01	39.1865487623125
1988-01-01	39.3411222531227
1988-04-01	39.8284389831643
1988-07-01	39.7257854201135
1988-10-01	40.1887325645688
1989-01-01	40.1075989310635
1989-04-01	41.1591013128365
1989-07-01	41.1062515416238
1989-10-01	41.1954051557303
1990-01-01	40.0779974080548
1990-04-01	41.1188054106960
1990-07-01	42.2986311939314
1990-10-01	42.5122413437794
1991-01-01	40.8031960322421
1991-04-01	40.4393570467351
1991-07-01	39.3350695189671
1991-10-01	40.0169086913562
1992-01-01	39.4338824753353
1992-04-01	39.5946698210538
1992-07-01	39.5820382283247
1992-10-01	38.7505278124633
1993-01-01	38.0581158869141
1993-04-01	38.3240837966232
1993-07-01	38.5749625708773
1993-10-01	39.3023523108844
1994-01-01	39.2494155822721
1994-04-01	40.5914756210289
1994-07-01	40.5598421229811
1994-10-01	40.7629230178986
1995-01-01	40.6819119034964
1995-04-01	41.7458529031733
1995-07-01	41.7252684627169
1995-10-01	42.2718377697317
1996-01-01	41.8634395236375
1996-04-01	42.3312610068131
1996-07-01	42.4130279211784
1996-10-01	42.5246746218688
1997-01-01	42.3919023251987
1997-04-01	42.8237875231236
1997-07-01	42.6677455392952
1997-10-01	42.9655554361164
1998-01-01	42.3759834390028
1998-04-01	43.9843541427729
1998-07-01	44.2663001100134
1998-10-01	43.8450758403449
1999-01-01	42.8163491938236
1999-04-01	43.6776764117524
1999-07-01	44.5450662295317
1999-10-01	45.0609096666678
2000-01-01	44.6546770102664
2000-04-01	46.1919184138308
2000-07-01	46.9189071581553
2000-10-01	46.4252885487058
2001-01-01	45.6221429852415
2001-04-01	46.9562615037859
2001-07-01	46.7922718407596
2001-10-01	47.5015255027089
2002-01-01	47.7930707390651
2002-04-01	48.5670926689985
2002-07-01	48.3797276749266
2002-10-01	49.1196745316505
2003-01-01	49.5775586350406
2003-04-01	50.4783849534686
2003-07-01	50.4928578413845
2003-10-01	50.5711221642616
2004-01-01	50.2755645982738
2004-04-01	51.7231650508643
2004-07-01	52.3443063778807
2004-10-01	52.4385608509690
2005-01-01	52.0460276594608
2005-04-01	53.3999192265537
2005-07-01	54.0558747544159
2005-10-01	54.3678301727766
2006-01-01	54.2352707191670
2006-04-01	55.3358576728269
2006-07-01	56.0775953837860
2006-10-01	56.0089717046415
2007-01-01	55.5297100811784
2007-04-01	56.8601401552105
2007-07-01	56.9946259125415
2007-10-01	56.6416361621453
2008-01-01	55.8857301383004
2008-04-01	57.4544995484083
2008-07-01	58.0884756024900
2008-10-01	57.8199215252280
2009-01-01	58.3251579725587
2009-04-01	59.1281654992918
2009-07-01	58.9897011683462
2009-10-01	59.6140665909004
2010-01-01	59.4513866901664
2010-04-01	60.3741348333157
2010-07-01	60.9568156963927
2010-10-01	61.6290229796760
2011-01-01	60.7684428023417
2011-04-01	61.2781435037625
2011-07-01	61.4459986442477
2011-10-01	61.1367994686552
2012-01-01	60.6114133930809
2012-04-01	61.6831922075818
2012-07-01	61.6307753501121
2012-10-01	61.7925586434866
2013-01-01	61.0837121046734
2013-04-01	62.0729373006650
2013-07-01	61.2661746109692
2013-10-01	61.1672130426606
2014-01-01	60.3453554691397
2014-04-01	61.6019263820371
2014-07-01	62.2028355919538
2014-10-01	61.5222559912454
2015-01-01	61.1812153461829
2015-04-01	62.2274191842534
2015-07-01	61.9227698425741
2015-10-01	63.1196678137073
2016-01-01	62.6267221548433
2016-04-01	62.7953000212790
2016-07-01	61.8392720171345
2016-10-01	62.6014474781264
2017-01-01	62.4362700938866
2017-04-01	63.9327490991214
2017-07-01	63.8040312888735
2017-10-01	64.1593548246486
2018-01-01	63.3312186189280
2018-04-01	63.5483254663013
2018-07-01	64.0431622075139