Quarter	Percent
1978-01-01	63.7011432260151
1978-04-01	66.5057096735420
1978-07-01	66.0244323278258
1978-10-01	65.3933474578478
1979-01-01	64.0200035352510
1979-04-01	66.4577527136075
1979-07-01	66.2915318379867
1979-10-01	65.4016670714784
1980-01-01	63.7808329929386
1980-04-01	66.3598013139638
1980-07-01	66.3317000385193
1980-10-01	65.3555350708012
1981-01-01	64.0558596985573
1981-04-01	66.4313392040314
1981-07-01	66.0614982950008
1981-10-01	65.5279038580218
1982-01-01	64.2954233295127
1982-04-01	66.5542667097918
1982-07-01	66.0099351377027
1982-10-01	65.7949107970459
1983-01-01	65.0638382867920
1983-04-01	67.2029247219947
1983-07-01	66.8518085063973
1983-10-01	65.9915902341380
1984-01-01	64.5246048030890
1984-04-01	66.8513092567837
1984-07-01	66.6840778131773
1984-10-01	65.9462482663375
1985-01-01	64.5976779604756
1985-04-01	66.5219941802874
1985-07-01	66.2354107493320
1985-10-01	65.4182829537308
1986-01-01	64.4337196709316
1986-04-01	66.2914349510379
1986-07-01	66.2428400410633
1986-10-01	65.2927020445656
1987-01-01	64.1674817086130
1987-04-01	66.3545507464002
1987-07-01	66.0868083073977
1987-10-01	65.4529002541516
1988-01-01	64.3465375331831
1988-04-01	66.5193715013674
1988-07-01	66.2066721152248
1988-10-01	65.4554555568336
1989-01-01	64.5168750493573
1989-04-01	66.8568093675867
1989-07-01	66.6186215992290
1989-10-01	66.0609155020737
1990-01-01	65.1749166809670
1990-04-01	67.2967886884168
1990-07-01	67.0653453297315
1990-10-01	66.6457979120306
1991-01-01	65.8352449836805
1991-04-01	67.8653377090578
1991-07-01	67.7790053350064
1991-10-01	67.2689787074158
1992-01-01	66.4332507299183
1992-04-01	68.0908858774804
1992-07-01	67.8332340699413
1992-10-01	67.7042340771589
1993-01-01	66.2395567415311
1993-04-01	68.0576289218222
1993-07-01	67.8514799956590
1993-10-01	67.6086375736028
1994-01-01	66.3563206753444
1994-04-01	68.1750111280701
1994-07-01	67.7543019018504
1994-10-01	67.1051520326822
1995-01-01	66.2090509822025
1995-04-01	67.8749520914992
1995-07-01	67.9206749835590
1995-10-01	67.1172318525020
1996-01-01	66.2263482932000
1996-04-01	68.1573727317226
1996-07-01	68.2341688845583
1996-10-01	67.4068297038092
1997-01-01	66.9075459367352
1997-04-01	68.5719939393914
1997-07-01	68.3314623512621
1997-10-01	67.6000191949984
1998-01-01	66.8773240202664
1998-04-01	68.3654143128637
1998-07-01	68.0191529910710
1998-10-01	67.3310432364315
1999-01-01	66.5358206203367
1999-04-01	67.9685379064209
1999-07-01	67.7529484757726
1999-10-01	67.1625241944542
2000-01-01	66.2210214314387
2000-04-01	67.6319069285900
2000-07-01	67.4039810669546
2000-10-01	67.2905052939806
2001-01-01	66.4800940184994
2001-04-01	67.4734504560466
2001-07-01	67.1437305296276
2001-10-01	66.8149880916303
2002-01-01	65.8771407635066
2002-04-01	66.7717827146881
2002-07-01	66.7864177634524
2002-10-01	66.3686422840860
2003-01-01	65.5277780828932
2003-04-01	66.8389696402512
2003-07-01	66.5445532171247
2003-10-01	66.1642948842286
2004-01-01	65.3908328159686
2004-04-01	66.5319499888446
2004-07-01	66.6340895944969
2004-10-01	66.0167679258270
2005-01-01	65.4477888430225
2005-04-01	66.8152805573749
2005-07-01	66.9045177940370
2005-10-01	66.4205450270534
2006-01-01	65.8348636422468
2006-04-01	67.1066197103604
2006-07-01	67.1228415851794
2006-10-01	66.8159044155744
2007-01-01	66.1733941230238
2007-04-01	67.6467523231780
2007-07-01	67.2381538538072
2007-10-01	67.1248830638898
2008-01-01	66.4285663904238
2008-04-01	67.7437990263483
2008-07-01	67.2991618455328
2008-10-01	67.0849499895514
2009-01-01	66.6655442274116
2009-04-01	67.5506483679015
2009-07-01	67.4125381212484
2009-10-01	66.9008329453000
2010-01-01	66.6460176901291
2010-04-01	67.4956068134531
2010-07-01	67.4639009889086
2010-10-01	67.1378331283966
2011-01-01	66.7441608070800
2011-04-01	67.4641740375240
2011-07-01	67.0330698599874
2011-10-01	67.0467091003270
2012-01-01	66.5198922196760
2012-04-01	67.3885254906877
2012-07-01	67.2218474193845
2012-10-01	67.1271301520212
2013-01-01	67.0704726901682
2013-04-01	67.9874281081652
2013-07-01	67.8524053408262
2013-10-01	68.0003637556394
2014-01-01	67.4430130316892
2014-04-01	68.3911399536626
2014-07-01	68.3376527563759
2014-10-01	68.2618437748340
2015-01-01	67.9618937581872
2015-04-01	68.6003352297339
2015-07-01	68.7938212994774
2015-10-01	68.7082775974838
2016-01-01	68.5708702274211
2016-04-01	69.3966437349023
2016-07-01	69.6898500500677
2016-10-01	69.6939143669525
2017-01-01	69.1858042109292
2017-04-01	70.2712188026970
2017-07-01	70.5128500274942
2017-10-01	70.4213887296905
2018-01-01	70.6246166891456
2018-04-01	71.7016316586394
2018-07-01	71.8126745352670