Quarter	Percent
1960-01-01	81.3359675359671
1960-04-01	84.7867491243792
1960-07-01	84.5430374887043
1960-10-01	83.9926917315541
1961-01-01	81.9768468705298
1961-04-01	84.7940406482886
1961-07-01	84.6854912293423
1961-10-01	83.9185871371337
1962-01-01	81.7655529662080
1962-04-01	84.6602011014130
1962-07-01	83.9916209878424
1962-10-01	82.8845155979477
1963-01-01	79.8929551088344
1963-04-01	83.4442473673240
1963-07-01	83.0202675100035
1963-10-01	82.1986076585042
1964-01-01	79.5107395011840
1964-04-01	82.4223450867507
1964-07-01	81.8720480631969
1964-10-01	81.3159449515780
1965-01-01	79.0982105715764
1965-04-01	81.8720589486095
1965-07-01	81.5457729818612
1965-10-01	80.7245082519979
1966-01-01	79.1092872313600
1966-04-01	81.9923658640803
1966-07-01	81.3290452308907
1966-10-01	80.4773206068712
1967-01-01	78.6521556086134
1967-04-01	81.8467211475006
1967-07-01	81.9046959179306
1967-10-01	80.5720184875007
1968-01-01	79.3665183407231
1968-04-01	82.1704281136121
1968-07-01	81.9858928381980
1968-10-01	81.3745134220538
1969-01-01	79.4412453363792
1969-04-01	82.0322290925790
1969-07-01	81.7445300861106
1969-10-01	80.9468259857546
1970-01-01	79.7010914917233
1970-04-01	81.7490338814929
1970-07-01	81.5422697259591
1970-10-01	80.6946365804443
1971-01-01	80.2057045286100
1971-04-01	82.2436196867286
1971-07-01	81.6150348273086
1971-10-01	80.9576898739136
1972-01-01	79.8900906720840
1972-04-01	81.8924683692130
1972-07-01	81.5316181957046
1972-10-01	80.6701184220781
1973-01-01	80.0197546070057
1973-04-01	81.7578498744828
1973-07-01	81.7949040752896
1973-10-01	81.2332151211311
1974-01-01	79.9348675924646
1974-04-01	81.6430159027688
1974-07-01	81.1991570759923
1974-10-01	80.6058256814624
1975-01-01	78.9002206164318
1975-04-01	80.3803656587889
1975-07-01	80.3582809344040
1975-10-01	80.1881716231283
1976-01-01	78.8051830455905
1976-04-01	79.9788297069922
1976-07-01	79.9151116742557
1976-10-01	79.5446114404700
1977-01-01	78.2067434912521
1977-04-01	79.5070423748832
1977-07-01	79.5437928577977
1977-10-01	78.9786650606155
1978-01-01	77.7705022352154
1978-04-01	79.5085838009612
1978-07-01	78.9728952639295
1978-10-01	78.5074629537089
1979-01-01	77.4745996118844
1979-04-01	79.4637328959190
1979-07-01	79.2662450886319
1979-10-01	78.6203659663169
1980-01-01	77.5802878651142
1980-04-01	79.1121125179195
1980-07-01	78.9392355470049
1980-10-01	78.3812824068249
1981-01-01	77.7580096275809
1981-04-01	78.9725891760913
1981-07-01	78.7034969963881
1981-10-01	77.8530787791401
1982-01-01	77.0248851541339
1982-04-01	78.7056719627736
1982-07-01	78.1895638742242
1982-10-01	77.8338042994013
1983-01-01	76.9179034217298
1983-04-01	78.4887275926616
1983-07-01	77.9960307747408
1983-10-01	77.3964631876748
1984-01-01	76.3312775432403
1984-04-01	77.7431421327928
1984-07-01	77.4505591632645
1984-10-01	76.9937134408741
1985-01-01	75.8969123236786
1985-04-01	77.2643608457907
1985-07-01	76.9524984790895
1985-10-01	76.2233997255996
1986-01-01	75.2691414483366
1986-04-01	76.7282796384473
1986-07-01	76.6013310085970
1986-10-01	75.8714718556802
1987-01-01	74.6394635429531
1987-04-01	76.0112613122640
1987-07-01	76.1103205058421
1987-10-01	75.5860421676130
1988-01-01	74.4883858135366
1988-04-01	76.2527113617730
1988-07-01	76.0640955355427
1988-10-01	75.6139894485996
1989-01-01	74.5970600211306
1989-04-01	76.1882401851412
1989-07-01	76.1213478347516
1989-10-01	75.8241779545106
1990-01-01	74.7942832007336
1990-04-01	76.5066894839895
1990-07-01	76.4086644410012
1990-10-01	76.3243683781581
1991-01-01	75.3772986842468
1991-04-01	76.9087855156786
1991-07-01	76.7833610912623
1991-10-01	76.5689194232513
1992-01-01	75.9120237851320
1992-04-01	76.8288998156667
1992-07-01	76.7175314024337
1992-10-01	76.5805798843081
1993-01-01	75.5493266557207
1993-04-01	76.7067658074328
1993-07-01	76.5520899354182
1993-10-01	76.2258219424421
1994-01-01	74.9653925752905
1994-04-01	76.1426789879478
1994-07-01	76.0486770788356
1994-10-01	75.5094261057279
1995-01-01	74.4127208237700
1995-04-01	75.6109302491194
1995-07-01	75.9514529044306
1995-10-01	75.1694038218171
1996-01-01	74.1618570365659
1996-04-01	75.4353841128349
1996-07-01	75.8211914572066
1996-10-01	75.3305621295010
1997-01-01	74.6576652967980
1997-04-01	75.9007583209538
1997-07-01	75.4413048102118
1997-10-01	74.8794649277006
1998-01-01	73.7949624040589
1998-04-01	74.6311542317594
1998-07-01	74.2816273657080
1998-10-01	73.8794429603969
1999-01-01	72.8782690017517
1999-04-01	73.4665298832012
1999-07-01	73.5841318214924
1999-10-01	73.4064341937716
2000-01-01	72.1102167405746
2000-04-01	72.9092890873528
2000-07-01	73.0079791465334
2000-10-01	73.0219092512837
2001-01-01	71.7055716644426
2001-04-01	72.1603127278220
2001-07-01	72.0213521674845
2001-10-01	71.3149480418234
2002-01-01	70.4086801438092
2002-04-01	70.8338584421364
2002-07-01	70.9410887057414
2002-10-01	70.3896181993451
2003-01-01	69.5667847054378
2003-04-01	70.4412192000874
2003-07-01	70.3957776795580
2003-10-01	70.1124313585681
2004-01-01	69.2142509127686
2004-04-01	70.3087674781072
2004-07-01	70.1751347463671
2004-10-01	69.9222081136924
2005-01-01	69.1868268142196
2005-04-01	70.2789546773802
2005-07-01	70.4963269860417
2005-10-01	70.1051864145955
2006-01-01	69.3403788137560
2006-04-01	70.4956845331039
2006-07-01	70.4278235151752
2006-10-01	70.1231122982616
2007-01-01	69.6967311010529
2007-04-01	70.8808167623227
2007-07-01	70.6260086553026
2007-10-01	70.1898379122088
2008-01-01	69.5008210699310
2008-04-01	70.4355763117665
2008-07-01	70.0025089110198
2008-10-01	69.6592359908774
2009-01-01	68.6295184216949
2009-04-01	68.7096074059695
2009-07-01	68.1001851363556
2009-10-01	67.9567010838470
2010-01-01	67.6201517948489
2010-04-01	68.2128956262850
2010-07-01	68.1100874198193
2010-10-01	67.7805826039397
2011-01-01	67.5903915448130
2011-04-01	68.1527047686294
2011-07-01	67.9413509429330
2011-10-01	67.7227011985731
2012-01-01	67.2509045156091
2012-04-01	67.7863203890735
2012-07-01	67.6821583151167
2012-10-01	67.5514678234515
2013-01-01	67.0006251199808
2013-04-01	67.8819942456207
2013-07-01	67.7009917636928
2013-10-01	67.6490383799425
2014-01-01	67.3676705356127
2014-04-01	68.2012794751124
2014-07-01	68.0763441799715
2014-10-01	67.6695582214796
2015-01-01	67.5146261483570
2015-04-01	68.0494659090263
2015-07-01	68.0260278291673
2015-10-01	67.9032543654104
2016-01-01	67.4892537028282
2016-04-01	68.4239308641273
2016-07-01	68.3428709945786
2016-10-01	68.3651197668700
2017-01-01	67.9265885863665
2017-04-01	68.6916642581856
2017-07-01	68.7550377229508
2017-10-01	68.5040815576087
2018-01-01	68.7717962162900
2018-04-01	69.6614887569836
2018-07-01	69.4307624847668