Quarter	Percent
1960-01-01	65.8550435128266
1960-04-01	70.7941019372493
1960-07-01	70.8122178389648
1960-10-01	69.7313265645746
1961-01-01	66.5543140694302
1961-04-01	70.6013027130010
1961-07-01	70.1682689260470
1961-10-01	69.3768152313427
1962-01-01	65.7880738896156
1962-04-01	70.0660408807782
1962-07-01	69.4380993468806
1962-10-01	68.0475985978732
1963-01-01	64.2278736581662
1963-04-01	68.7307461441172
1963-07-01	68.3137666222301
1963-10-01	67.0561915908511
1964-01-01	63.8690402777936
1964-04-01	67.8811958094522
1964-07-01	67.0703482849890
1964-10-01	65.8385904297574
1965-01-01	63.1843575627759
1965-04-01	67.1692694476565
1965-07-01	66.8919707647082
1965-10-01	65.6251351159541
1966-01-01	63.5074654244337
1966-04-01	67.4439010806363
1966-07-01	66.8715992067502
1966-10-01	65.5367987361906
1967-01-01	63.3506880176020
1967-04-01	67.8301734218060
1967-07-01	67.0859563951183
1967-10-01	65.6021329844240
1968-01-01	63.5448130052551
1968-04-01	67.5747604188263
1968-07-01	67.0963442853272
1968-10-01	65.7262858975411
1969-01-01	63.4229875276426
1969-04-01	67.1074728927284
1969-07-01	66.6596180384230
1969-10-01	65.1568854277348
1970-01-01	63.4833487218776
1970-04-01	66.7949658296240
1970-07-01	66.4825146064895
1970-10-01	64.9479496154460
1971-01-01	63.6610920372871
1971-04-01	66.3732040544199
1971-07-01	65.7484016219722
1971-10-01	64.5868749679520
1972-01-01	63.0802476032429
1972-04-01	65.3991459727323
1972-07-01	65.2151309238204
1972-10-01	64.4275616316084
1973-01-01	63.5840960329492
1973-04-01	65.4519901608168
1973-07-01	65.3791419065615
1973-10-01	64.7890805515897
1974-01-01	62.6925786005665
1974-04-01	64.8977432313280
1974-07-01	64.2935418149258
1974-10-01	63.4850092314943
1975-01-01	61.6346439182591
1975-04-01	64.0556044985798
1975-07-01	64.0366444982510
1975-10-01	63.1780411257289
1976-01-01	61.8759782082278
1976-04-01	63.7671648913418
1976-07-01	63.9087891651904
1976-10-01	63.0383430302048
1977-01-01	61.6727653463830
1977-04-01	64.2108394585663
1977-07-01	64.1366141851709
1977-10-01	63.2718320029573
1978-01-01	61.9599205272286
1978-04-01	64.6859923415000
1978-07-01	64.1596580461385
1978-10-01	63.4849094739385
1979-01-01	62.0716826085708
1979-04-01	64.5276361445284
1979-07-01	64.4101522531883
1979-10-01	63.4821357846004
1980-01-01	61.8960460256224
1980-04-01	64.3386999822565
1980-07-01	64.3701527703867
1980-10-01	63.3402203343796
1981-01-01	62.0869383327279
1981-04-01	64.4203466005850
1981-07-01	64.0997859966074
1981-10-01	63.4358677726277
1982-01-01	62.1911521824904
1982-04-01	64.4503654647311
1982-07-01	63.9281969350194
1982-10-01	63.6958335932949
1983-01-01	62.8322276315178
1983-04-01	65.0030584596227
1983-07-01	64.5927402912286
1983-10-01	63.7681827392537
1984-01-01	62.2948432696727
1984-04-01	64.5973458414532
1984-07-01	64.3899342608430
1984-10-01	63.6462768682461
1985-01-01	62.2801591565180
1985-04-01	64.1976711419351
1985-07-01	63.9222337818551
1985-10-01	62.9916669557800
1986-01-01	61.9563146619627
1986-04-01	63.9791153199069
1986-07-01	63.8080267385963
1986-10-01	62.8551970782736
1987-01-01	61.6011587271553
1987-04-01	63.7770198965114
1987-07-01	63.4806226319078
1987-10-01	62.8374742455690
1988-01-01	61.6624199684952
1988-04-01	63.7628752661919
1988-07-01	63.5135526045930
1988-10-01	62.7152373691493
1989-01-01	61.7201258831690
1989-04-01	64.0218677535484
1989-07-01	63.7705263505630
1989-10-01	63.1758537179291
1990-01-01	62.2429440051540
1990-04-01	64.3026819886370
1990-07-01	64.1056807675969
1990-10-01	63.6425086500999
1991-01-01	62.7649692507149
1991-04-01	64.7715370647412
1991-07-01	64.5984389942884
1991-10-01	64.1141326341328
1992-01-01	63.1357592570111
1992-04-01	64.7404498130365
1992-07-01	64.4227029588525
1992-10-01	64.2257381924472
1993-01-01	62.7085732509278
1993-04-01	64.5306995977745
1993-07-01	64.3124802779890
1993-10-01	63.9794397227437
1994-01-01	62.7008444176212
1994-04-01	64.5101120373810
1994-07-01	64.0745576609801
1994-10-01	63.4113797273468
1995-01-01	62.4398958624298
1995-04-01	64.1126216799284
1995-07-01	64.0998888585989
1995-10-01	63.2383822443341
1996-01-01	62.3101527426871
1996-04-01	64.1681514918878
1996-07-01	64.2362470288242
1996-10-01	63.4216134038406
1997-01-01	62.7806811781512
1997-04-01	64.4813714510308
1997-07-01	64.2141331450829
1997-10-01	63.4319318282314
1998-01-01	62.6401439594049
1998-04-01	64.1399471515811
1998-07-01	63.7333564383604
1998-10-01	63.0119864753602
1999-01-01	62.1577950182375
1999-04-01	63.6058673399987
1999-07-01	63.3531210122733
1999-10-01	62.7050264739949
2000-01-01	61.6893870263530
2000-04-01	63.0077669630419
2000-07-01	62.7814041341132
2000-10-01	62.5877186932374
2001-01-01	61.6425723982345
2001-04-01	62.5681695756640
2001-07-01	62.2351014596179
2001-10-01	61.8497021714295
2002-01-01	60.7971307798568
2002-04-01	61.6521423300296
2002-07-01	61.5624666147338
2002-10-01	61.0529523988024
2003-01-01	60.2235718060725
2003-04-01	61.4897585622483
2003-07-01	61.1564447489333
2003-10-01	60.6218496409141
2004-01-01	59.8551848945412
2004-04-01	60.9525837409751
2004-07-01	60.9852777878566
2004-10-01	60.2299535025622
2005-01-01	59.6468875136513
2005-04-01	60.9630194660745
2005-07-01	60.9467426790908
2005-10-01	60.3644835279467
2006-01-01	59.6935223761147
2006-04-01	60.8482163850164
2006-07-01	60.8393087612022
2006-10-01	60.4571859002093
2007-01-01	59.7059451813733
2007-04-01	61.0340515343117
2007-07-01	60.6381077221920
2007-10-01	60.3817431398077
2008-01-01	59.6068615420980
2008-04-01	60.8942677373567
2008-07-01	60.3801516883687
2008-10-01	60.0372564453157
2009-01-01	59.5387653435980
2009-04-01	60.3948205287171
2009-07-01	60.1969976525734
2009-10-01	59.5952876638268
2010-01-01	59.2363200507602
2010-04-01	60.0870823314379
2010-07-01	59.9975815505984
2010-10-01	59.5585256310222
2011-01-01	59.1008599572478
2011-04-01	59.6863610413351
2011-07-01	59.3901645994883
2011-10-01	59.2148216902202
2012-01-01	58.6966464816422
2012-04-01	59.4596270160833
2012-07-01	59.2360231294837
2012-10-01	59.0271417665348
2013-01-01	58.8323773058130
2013-04-01	59.6444403293383
2013-07-01	59.4800281774255
2013-10-01	59.5606546181236
2014-01-01	58.9171864701259
2014-04-01	59.8516060746831
2014-07-01	59.7388268435897
2014-10-01	59.5792527438931
2015-01-01	59.1916436342666
2015-04-01	59.8318086401060
2015-07-01	59.9056778293732
2015-10-01	59.7088800082736
2016-01-01	59.4518000914386
2016-04-01	60.2370765191325
2016-07-01	60.4430589285117
2016-10-01	60.2364660663189
2017-01-01	59.7597543513797
2017-04-01	60.7604631069752
2017-07-01	60.9449917869760
2017-10-01	60.6682388688427
2018-01-01	60.8854249354909
2018-04-01	61.7830088046249
2018-07-01	61.7874165117965