Quarter	Percent
1968-01-01	65.7593345667912
1968-04-01	69.9427820943517
1968-07-01	69.4864786312370
1968-10-01	68.2000090715663
1969-01-01	65.7893121873403
1969-04-01	69.4733019784263
1969-07-01	69.1145432955589
1969-10-01	67.8413951375903
1970-01-01	66.0240730456448
1970-04-01	69.4255080990520
1970-07-01	68.9961740122880
1970-10-01	67.6586273230178
1971-01-01	66.3705106168623
1971-04-01	69.0713418577984
1971-07-01	68.4145401857099
1971-10-01	67.4040090610212
1972-01-01	65.6810296722915
1972-04-01	68.1048851213444
1972-07-01	68.0512575055582
1972-10-01	67.4591327180359
1973-01-01	66.4555668772072
1973-04-01	68.3727420950036
1973-07-01	68.3574466021067
1973-10-01	67.8652784138850
1974-01-01	65.6567115558848
1974-04-01	68.0114245675988
1974-07-01	67.2801420309933
1974-10-01	66.4785621958187
1975-01-01	64.3554678275742
1975-04-01	66.8976326778290
1975-07-01	66.8949957262248
1975-10-01	66.0707929978254
1976-01-01	64.6046213070421
1976-04-01	66.6210813712505
1976-07-01	66.9354056013074
1976-10-01	66.1758230740032
1977-01-01	64.6891843289985
1977-04-01	67.2760563041712
1977-07-01	67.1753480322236
1977-10-01	66.5351498955178
1978-01-01	65.0207135959058
1978-04-01	67.7972688184328
1978-07-01	67.2465246796026
1978-10-01	66.7700310531039
1979-01-01	65.4021652178113
1979-04-01	67.9611823321494
1979-07-01	67.7541662575686
1979-10-01	67.1016873028790
1980-01-01	65.5096268846038
1980-04-01	67.9413651247952
1980-07-01	67.9266807409695
1980-10-01	67.0222804770130
1981-01-01	65.6204461567324
1981-04-01	67.9611834636575
1981-07-01	67.7234571158106
1981-10-01	67.2315010794446
1982-01-01	66.0324877039404
1982-04-01	68.1055941948220
1982-07-01	67.6037052570494
1982-10-01	67.4651366815646
1983-01-01	66.4391145107135
1983-04-01	68.5837365369424
1983-07-01	68.2935135859334
1983-10-01	67.5914004201500
1984-01-01	66.0198073005598
1984-04-01	68.2496963405245
1984-07-01	68.1709821970674
1984-10-01	67.6368394082402
1985-01-01	66.2265699823230
1985-04-01	68.1707793339649
1985-07-01	67.9162290545074
1985-10-01	67.1089769695686
1986-01-01	66.1078450388189
1986-04-01	67.9518141414616
1986-07-01	67.8357915417640
1986-10-01	67.0319936837686
1987-01-01	65.6785650246492
1987-04-01	67.7859163128484
1987-07-01	67.7701919927349
1987-10-01	67.2617679838282
1988-01-01	66.0753020014404
1988-04-01	68.3121063198896
1988-07-01	67.9952820212978
1988-10-01	67.4669967220512
1989-01-01	66.6560141817308
1989-04-01	68.9225994390805
1989-07-01	68.5888527653164
1989-10-01	68.2636117721060
1990-01-01	67.5139786841292
1990-04-01	69.4857069514116
1990-07-01	69.1938714775981
1990-10-01	69.0484543929887
1991-01-01	68.2058437830142
1991-04-01	70.0958658493013
1991-07-01	69.8327903989523
1991-10-01	69.7445470997086
1992-01-01	68.7680157982902
1992-04-01	70.3166983602548
1992-07-01	69.9142329962946
1992-10-01	70.0279693030542
1993-01-01	68.4629464263604
1993-04-01	70.2062566108898
1993-07-01	69.8846128608117
1993-10-01	69.7099790045644
1994-01-01	68.2952304689518
1994-04-01	70.1802866012298
1994-07-01	69.6108668187132
1994-10-01	69.2666735508445
1995-01-01	68.2789913127286
1995-04-01	69.8360502842602
1995-07-01	69.6823656024622
1995-10-01	69.1955891188874
1996-01-01	68.3949760046154
1996-04-01	70.0478073898474
1996-07-01	70.1686969252353
1996-10-01	69.6362239145252
1997-01-01	69.1880475065180
1997-04-01	70.6277651723068
1997-07-01	70.4973259737693
1997-10-01	69.9584214446135
1998-01-01	69.1116942762886
1998-04-01	70.0379483505914
1998-07-01	69.8149934588284
1998-10-01	69.3154169192833
1999-01-01	68.2935350856518
1999-04-01	69.3720009637533
1999-07-01	69.3538684616594
1999-10-01	69.0919109954970
2000-01-01	67.9839873025335
2000-04-01	69.3659805702922
2000-07-01	69.3046855834110
2000-10-01	69.3114637127456
2001-01-01	68.5503407806098
2001-04-01	69.2667004359306
2001-07-01	68.9378046567599
2001-10-01	68.6648110064193
2002-01-01	67.7244393375071
2002-04-01	68.4117743436220
2002-07-01	68.5943815455078
2002-10-01	68.5483913505249
2003-01-01	67.6292046219296
2003-04-01	68.6056249519097
2003-07-01	68.7856693919348
2003-10-01	68.8289673532726
2004-01-01	67.9814370669041
2004-04-01	68.9795900079886
2004-07-01	69.2413347931613
2004-10-01	69.0466976501116
2005-01-01	68.3678073896566
2005-04-01	69.7065110182348
2005-07-01	69.9186757276084
2005-10-01	69.4852862470548
2006-01-01	69.1112913561574
2006-04-01	70.4319605599194
2006-07-01	70.3493339354580
2006-10-01	70.2354735751018
2007-01-01	69.7673985418787
2007-04-01	71.4011286579241
2007-07-01	70.9543542648625
2007-10-01	70.9813726787282
2008-01-01	70.1384929054571
2008-04-01	71.3980213925006
2008-07-01	70.9799057015328
2008-10-01	70.9771798296849
2009-01-01	69.9583439351634
2009-04-01	70.3696127451947
2009-07-01	70.2101649680324
2009-10-01	70.1642317056558
2010-01-01	69.7490826439953
2010-04-01	70.3795912929802
2010-07-01	70.5394176841168
2010-10-01	70.4820775754079
2011-01-01	70.3171520438274
2011-04-01	71.4119546973176
2011-07-01	70.8978193936901
2011-10-01	70.6776778063132
2012-01-01	69.8924767921847
2012-04-01	70.8144154279680
2012-07-01	70.7969125510435
2012-10-01	70.9704936689676
2013-01-01	70.8822496369302
2013-04-01	71.8581455939794
2013-07-01	71.9266698362755
2013-10-01	72.3669357297112
2014-01-01	72.0027323851950
2014-04-01	72.9030941821937
2014-07-01	72.9498652107428
2014-10-01	73.1871260266798
2015-01-01	72.7101762766708
2015-04-01	73.3686786824244
2015-07-01	73.6220022684434
2015-10-01	73.8702445096608
2016-01-01	73.7007841321542
2016-04-01	74.3457082379085
2016-07-01	74.8343785259218
2016-10-01	74.9049730432005
2017-01-01	74.4714776494473
2017-04-01	75.3519920413049
2017-07-01	75.6650222335609
2017-10-01	75.8165981994535
2018-01-01	76.1368148904524
2018-04-01	76.9787748128015
2018-07-01	77.1401001109321