Quarter	Percent
1960-01-01	50.2602150468062
1960-04-01	43.5250938342387
1960-07-01	43.1089816828819
1960-10-01	44.5981210131159
1961-01-01	49.1739167718593
1961-04-01	43.7754253963460
1961-07-01	44.3996597451301
1961-10-01	45.0697545283030
1962-01-01	50.3007422172670
1962-04-01	44.4523748123055
1962-07-01	45.0289457482007
1962-10-01	46.7394965365950
1963-01-01	51.7297052086378
1963-04-01	45.9004475929993
1963-07-01	46.3403730872523
1963-10-01	47.9616744577573
1964-01-01	51.9494086936387
1964-04-01	46.5101809607130
1964-07-01	47.5918125176882
1964-10-01	49.3895127601275
1965-01-01	52.7237271495777
1965-04-01	47.4518034702249
1965-07-01	47.7290449903424
1965-10-01	49.4117276366895
1966-01-01	52.3325321111579
1966-04-01	47.1052555479117
1966-07-01	47.5933155930887
1966-10-01	49.3452212401960
1967-01-01	52.2558376982008
1967-04-01	46.1855221653857
1967-07-01	47.6084256449184
1967-10-01	49.3211619191090
1968-01-01	52.5595122592088
1968-04-01	47.0338774859256
1968-07-01	47.8518679102298
1968-10-01	49.7603067789125
1969-01-01	52.7747084059913
1969-04-01	47.8608321319065
1969-07-01	48.4034863359132
1969-10-01	50.3927153208066
1970-01-01	52.8500864139704
1970-04-01	48.1485860141772
1970-07-01	48.6374456023203
1970-10-01	50.7726888086978
1971-01-01	53.0677217601114
1971-04-01	49.5204004721013
1971-07-01	50.1374152991642
1971-10-01	51.8244660665587
1972-01-01	54.2435981535720
1972-04-01	51.2744930937756
1972-07-01	51.3514002503093
1972-10-01	51.8306238560420
1973-01-01	53.1414181467873
1973-04-01	50.9619689499753
1973-07-01	50.9781065603809
1973-10-01	51.5162116762209
1974-01-01	54.8379027680610
1974-04-01	51.8934768085376
1974-07-01	52.6588949567489
1974-10-01	53.7950313489238
1975-01-01	56.3088240088087
1975-04-01	52.7728124085350
1975-07-01	52.8023804172015
1975-10-01	54.5339010106397
1976-01-01	56.1608369355076
1976-04-01	53.2564888664017
1976-07-01	52.7683329905670
1976-10-01	54.1083029233814
1977-01-01	55.8290078387241
1977-04-01	51.8644123030806
1977-07-01	51.9792364702405
1977-10-01	53.1190135973311
1978-01-01	54.9689819275703
1978-04-01	51.0633775122093
1978-07-01	51.5542027657566
1978-10-01	52.4475564657919
1979-01-01	54.3129892941113
1979-04-01	51.1474731347662
1979-07-01	51.1964279355065
1979-10-01	52.3585933459330
1980-01-01	54.5484756523060
1980-04-01	51.0432358300626
1980-07-01	50.8692555301613
1980-10-01	52.5339373453036
1981-01-01	54.5496415597011
1981-04-01	51.0542649917447
1981-07-01	51.3081749307094
1981-10-01	51.8424138846790
1982-01-01	53.7047024899712
1982-04-01	50.7755031185156
1982-07-01	51.2529566434997
1982-10-01	51.4595481660678
1983-01-01	52.6406357002832
1983-04-01	49.7319358410585
1983-07-01	49.9930225303107
1983-10-01	51.0248451595722
1984-01-01	53.1129363690959
1984-04-01	49.8361528833515
1984-07-01	49.9200520825373
1984-10-01	50.8600532761796
1985-01-01	52.6537209091254
1985-04-01	49.9898475251446
1985-07-01	50.1961880303006
1985-10-01	51.4935806936894
1986-01-01	52.7049319800089
1986-04-01	50.0716185979168
1986-07-01	50.3017309554256
1986-10-01	51.4552681510121
1987-01-01	52.9587632177670
1987-04-01	49.9899539181488
1987-07-01	50.4820939231688
1987-10-01	51.1270898099183
1988-01-01	52.5512821182443
1988-04-01	49.8410966656412
1988-07-01	50.1121088255321
1988-10-01	51.0999879841771
1989-01-01	52.1989176173728
1989-04-01	49.1978417139457
1989-07-01	49.5199092937542
1989-10-01	50.3123500356587
1990-01-01	51.2835007328406
1990-04-01	48.7058119827629
1990-07-01	48.9990119085051
1990-10-01	49.8265171159035
1991-01-01	50.8194420719205
1991-04-01	48.1918213105201
1991-07-01	48.4357960863398
1991-10-01	49.0855914959974
1992-01-01	50.5178775381122
1992-04-01	48.2418764445376
1992-07-01	48.7904515027543
1992-10-01	49.0642582559576
1993-01-01	51.1415338855606
1993-04-01	48.7140640414773
1993-07-01	49.0579143805144
1993-10-01	49.5254478713470
1994-01-01	50.9912964143664
1994-04-01	48.5532496368743
1994-07-01	49.4096947541075
1994-10-01	50.1085363493392
1995-01-01	51.1109882017208
1995-04-01	48.9621818601915
1995-07-01	49.3794935006662
1995-10-01	50.4341446630050
1996-01-01	51.3814138789053
1996-04-01	49.0298087052231
1996-07-01	49.1411904461669
1996-10-01	50.2022577481485
1997-01-01	50.9123347826215
1997-04-01	48.7426872111463
1997-07-01	48.9046971272923
1997-10-01	49.8544531664751
1998-01-01	50.7152750642434
1998-04-01	48.8901014556960
1998-07-01	49.3234872659476
1998-10-01	50.3560376424977
1999-01-01	51.4182117031509
1999-04-01	49.4072562960473
1999-07-01	49.7236369745832
1999-10-01	50.7017927696754
2000-01-01	51.7939493238600
2000-04-01	49.8714692432161
2000-07-01	50.2568602131960
2000-10-01	50.6555537612435
2001-01-01	51.3616741997130
2001-04-01	50.2083780315811
2001-07-01	50.6325749149058
2001-10-01	50.9304348608417
2002-01-01	52.0966094979547
2002-04-01	50.9747333560221
2002-07-01	51.1483180092524
2002-10-01	51.5403144247121
2003-01-01	52.4953872284506
2003-04-01	50.9594360714880
2003-07-01	51.2026103707550
2003-10-01	51.8475037837322
2004-01-01	52.5116274095052
2004-04-01	51.2405595562623
2004-07-01	51.0211140354386
2004-10-01	52.0277303303901
2005-01-01	52.6108788453330
2005-04-01	50.9396921734293
2005-07-01	50.9741582173394
2005-10-01	51.8087851593254
2006-01-01	52.4968446674226
2006-04-01	51.1070509679862
2006-07-01	51.0095724877246
2006-10-01	51.4235982789558
2007-01-01	52.5255725130836
2007-04-01	50.8699070611660
2007-07-01	51.3011965957775
2007-10-01	51.4167067464791
2008-01-01	52.4131877560388
2008-04-01	50.8388920183434
2008-07-01	51.3766842574399
2008-10-01	51.7400161225504
2009-01-01	52.1184984858875
2009-04-01	51.0585084969109
2009-07-01	51.0167217368238
2009-10-01	51.7305743047942
2010-01-01	52.2194241020491
2010-04-01	51.2130825453986
2010-07-01	51.1926220059429
2010-10-01	51.5566454848682
2011-01-01	52.1943113865626
2011-04-01	51.5615183395588
2011-07-01	51.7199027646573
2011-10-01	51.8146772847704
2012-01-01	52.4535902476941
2012-04-01	51.4447952166660
2012-07-01	51.6125323779052
2012-10-01	51.7167550267874
2013-01-01	51.8313917831394
2013-04-01	50.9055805240982
2013-07-01	51.0301932900780
2013-10-01	50.5742358493391
2014-01-01	51.4947288315408
2014-04-01	50.4528423299286
2014-07-01	50.5049029922462
2014-10-01	50.3191867724320
2015-01-01	51.0218327080102
2015-04-01	50.1597146190407
2015-07-01	50.0232894568506
2015-10-01	50.1828181507564
2016-01-01	50.3600100667978
2016-04-01	49.5878919862901
2016-07-01	49.1466499066440
2016-10-01	49.4427837036030
2017-01-01	49.8838792478696
2017-04-01	48.6202841959204
2017-07-01	48.3397320739706
2017-10-01	48.5017733210044
2018-01-01	48.2122828054364
2018-04-01	47.2861230381201
2018-07-01	47.0906249267383