Quarter	Percent
1978-04-01	73.2578407374153
1978-07-01	72.1066521223273
1978-10-01	70.6046831948012
1979-01-01	69.8806905480911
1979-04-01	69.8337333838699
1979-07-01	70.1952601925554
1979-10-01	69.8260548998209
1980-01-01	69.1875069263249
1980-04-01	69.4529247390893
1980-07-01	69.2093727616256
1980-10-01	68.2437641530908
1981-01-01	67.5465275058783
1981-04-01	67.3738561868009
1981-07-01	68.2871702823070
1981-10-01	67.2188709779011
1982-01-01	66.6213678542567
1982-04-01	65.5980740893076
1982-07-01	65.6467259305932
1982-10-01	64.9342273296346
1983-01-01	63.7222963676501
1983-04-01	63.2052899994312
1983-07-01	62.9014168037116
1983-10-01	62.4821172435472
1984-01-01	62.6063726591866
1984-04-01	62.6489897381872
1984-07-01	62.0145498458061
1984-10-01	61.4679216164418
1985-01-01	61.0000608389176
1985-04-01	60.3516417224717
1985-07-01	61.3170442571848
1985-10-01	62.8344443039904
1986-01-01	61.7818985480287
1986-04-01	62.2306068564376
1986-07-01	61.5841037086909
1986-10-01	62.1827236265968
1987-01-01	61.6044159815362
1987-04-01	61.6678945643124
1987-07-01	60.6423791555100
1987-10-01	61.5637229708043
1988-01-01	62.0964388355358
1988-04-01	62.2418134828641
1988-07-01	61.4857437982745
1988-10-01	60.8487528510770
1989-01-01	61.7796015388231
1989-04-01	62.7365246596084
1989-07-01	63.1047851915785
1989-10-01	62.8976302736626
1990-01-01	61.4160538126774
1990-04-01	62.5095102033770
1990-07-01	63.7391443758887
1990-10-01	63.6686922294463
1991-01-01	62.4011809986592
1991-04-01	61.8592665299469
1991-07-01	61.0118234932555
1991-10-01	61.6714175125980
1992-01-01	61.8058129279894
1992-04-01	61.5435523200975
1992-07-01	61.9141164907964
1992-10-01	60.9760545750142
1993-01-01	59.9294836305971
1993-04-01	60.1415277451818
1993-07-01	59.8431039804632
1993-10-01	61.4004005859147
1994-01-01	61.7227872687508
1994-04-01	61.6537893498064
1994-07-01	61.1699306968313
1994-10-01	61.0551533722363
1995-01-01	61.2883158337920
1995-04-01	61.3783813350985
1995-07-01	61.5401793361543
1995-10-01	61.4417843324391
1996-01-01	60.3218315216646
1996-04-01	60.4973064432273
1996-07-01	60.5853454282821
1996-10-01	60.5518540658250
1997-01-01	60.4816217419801
1997-04-01	60.1062317430248
1997-07-01	60.0230496975333
1997-10-01	60.3225092424942
1998-01-01	59.6898742372097
1998-04-01	60.9405934079866
1998-07-01	61.1024659341614
1998-10-01	60.5063626445912
1999-01-01	59.9726184581960
1999-04-01	60.1185376405883
1999-07-01	61.0081340602723
1999-10-01	60.8980256545498
2000-01-01	59.9927768802453
2000-04-01	60.8055045844141
2000-07-01	61.5368754469985
2000-10-01	61.0510832077363
2001-01-01	59.8457049198444
2001-04-01	60.6989040733621
2001-07-01	60.5603496506713
2001-10-01	61.0465405187087
2002-01-01	61.4142072073596
2002-04-01	62.3480021466734
2002-07-01	61.6848824054491
2002-10-01	62.4971951732656
2003-01-01	63.2406631431998
2003-04-01	63.3744055479374
2003-07-01	63.5910653764163
2003-10-01	63.7319842660493
2004-01-01	63.5593062750401
2004-04-01	65.0261013835728
2004-07-01	65.1675440427788
2004-10-01	64.8169877491397
2005-01-01	64.8314799581735
2005-04-01	66.4280680100787
2005-07-01	66.5825994762166
2005-10-01	66.9530725305046
2006-01-01	66.5681628385319
2006-04-01	67.3082471983344
2006-07-01	68.0701912020410
2006-10-01	67.2076108228046
2007-01-01	67.1582185570009
2007-04-01	68.2429768456551
2007-07-01	67.9985628394114
2007-10-01	67.2035977448262
2008-01-01	66.2282297654110
2008-04-01	68.1664747782768
2008-07-01	68.1965706436487
2008-10-01	67.9740553037114
2009-01-01	68.7950854780009
2009-04-01	69.3076451987337
2009-07-01	69.5135062757405
2009-10-01	69.5552941129898
2010-01-01	70.2938679267794
2010-04-01	71.1295915158392
2010-07-01	71.6943704482354
2010-10-01	71.7688287390131
2011-01-01	71.8971940777912
2011-04-01	72.0069709960356
2011-07-01	71.5714089726384
2011-10-01	71.1853656655935
2012-01-01	70.7312979955192
2012-04-01	71.7921488768404
2012-07-01	72.0486131474847
2012-10-01	72.4261256885773
2013-01-01	72.0043015727667
2013-04-01	72.4320855961410
2013-07-01	72.2500606653151
2013-10-01	71.7472277651584
2014-01-01	71.7671948561400
2014-04-01	72.1796508120333
2014-07-01	72.6162809786832
2014-10-01	72.1004724851483
2015-01-01	72.2375723863696
2015-04-01	73.2479071083057
2015-07-01	72.6673249730264
2015-10-01	72.9648981519514
2016-01-01	72.8639502258884
2016-04-01	72.4405374187726
2016-07-01	71.0140764947091
2016-10-01	71.4430874477909
2017-01-01	71.3266064691580
2017-04-01	72.7889450997851
2017-07-01	73.1209104723524
2017-10-01	73.7970966037375
2018-01-01	73.6569236061989
2018-04-01	72.8823221223198
2018-07-01	73.0835427747381