Quarter	Percent
1968-01-01	60.4984798314320
1968-04-01	65.7651204119150
1968-07-01	65.9970581626978
1968-10-01	64.2479764713457
1969-01-01	60.9490582513760
1969-04-01	65.8982185544430
1969-07-01	65.5151356440605
1969-10-01	63.7576355388417
1970-01-01	60.9204936928488
1970-04-01	65.1114860308292
1970-07-01	64.9174204731582
1970-10-01	62.3481166464156
1971-01-01	60.6171422977797
1971-04-01	65.3485510019054
1971-07-01	65.0117585509587
1971-10-01	63.2902041778552
1972-01-01	58.8902777254307
1972-04-01	63.6754407170659
1972-07-01	63.9500472339347
1972-10-01	62.0964730101474
1973-01-01	60.4570616032116
1973-04-01	63.1997650296818
1973-07-01	64.0710411760508
1973-10-01	63.8921001926782
1974-01-01	60.1841369058692
1974-04-01	63.1580462672102
1974-07-01	63.4167996846059
1974-10-01	61.6701456303305
1975-01-01	58.8912460435123
1975-04-01	62.4282131793687
1975-07-01	63.1661972734895
1975-10-01	60.8009668303678
1976-01-01	58.6003591380686
1976-04-01	62.1106684036601
1976-07-01	63.0625708470944
1976-10-01	61.0821957827058
1977-01-01	57.6063834050705
1977-04-01	61.7808080049180
1977-07-01	62.3959070951732
1977-10-01	61.1098566407967
1978-01-01	57.9985975312843
1978-04-01	62.3078587126718
1978-07-01	62.4950942125312
1978-10-01	61.1832475006483
1979-01-01	58.3660239899475
1979-04-01	62.7499523142677
1979-07-01	62.7156033912070
1979-10-01	61.1853957904225
1980-01-01	58.7941257344897
1980-04-01	63.3652500528455
1980-07-01	63.1932823926192
1980-10-01	60.6150287164961
1981-01-01	58.4303841220146
1981-04-01	62.2586786800020
1981-07-01	62.4080111902989
1981-10-01	60.5956838047276
1982-01-01	59.1183098155120
1982-04-01	62.3600537211823
1982-07-01	62.3557474138172
1982-10-01	60.5470944722590
1983-01-01	59.2626246933140
1983-04-01	62.9673910644936
1983-07-01	62.7526882222550
1983-10-01	61.0905174785782
1984-01-01	58.7237107104069
1984-04-01	61.9107421538962
1984-07-01	61.6695271383055
1984-10-01	60.2578579647519
1985-01-01	58.7130742218436
1985-04-01	62.5711499997214
1985-07-01	61.8878842640959
1985-10-01	59.9763580243257
1986-01-01	58.1668424305948
1986-04-01	61.3301390704441
1986-07-01	61.5486725886084
1986-10-01	60.4860674377675
1987-01-01	58.3470703948195
1987-04-01	61.4444715041278
1987-07-01	61.4358032213974
1987-10-01	61.0604751211904
1988-01-01	59.3444471598700
1988-04-01	61.8307435641656
1988-07-01	61.9130629514163
1988-10-01	60.7681315241980
1989-01-01	59.9307694995110
1989-04-01	62.5470277598893
1989-07-01	62.8962042021280
1989-10-01	62.4648602035449
1990-01-01	61.0942319284210
1990-04-01	64.0723048996135
1990-07-01	64.1574616437429
1990-10-01	63.4526177601445
1991-01-01	62.7764099485267
1991-04-01	65.2473601001689
1991-07-01	65.6618375158988
1991-10-01	64.6592776252743
1992-01-01	63.7399852828303
1992-04-01	64.7944007841200
1992-07-01	65.3022387566335
1992-10-01	64.9549720428501
1993-01-01	63.8340805852583
1993-04-01	65.0843692961422
1993-07-01	65.4944345207554
1993-10-01	63.8423631002466
1994-01-01	62.6651579085028
1994-04-01	64.5736697391110
1994-07-01	64.6129237640132
1994-10-01	63.2433618608734
1995-01-01	62.5766855634117
1995-04-01	64.5370372711206
1995-07-01	64.5200651520572
1995-10-01	63.6267836419457
1996-01-01	61.6646810872029
1996-04-01	64.0836405010279
1996-07-01	64.6355277184821
1996-10-01	64.3805823093254
1997-01-01	62.8718637212574
1997-04-01	64.9576236600557
1997-07-01	64.8266123434110
1997-10-01	64.1847020606650
1998-01-01	62.8864119080949
1998-04-01	64.2503488197685
1998-07-01	64.3078572331657
1998-10-01	63.5139767603938
1999-01-01	62.9048162241700
1999-04-01	63.8594148715210
1999-07-01	64.0674841215410
1999-10-01	63.3466127200724
2000-01-01	62.1331680782208
2000-04-01	62.7332358990638
2000-07-01	63.5205157133738
2000-10-01	62.9040119312462
2001-01-01	62.1631343106029
2001-04-01	62.1913313562008
2001-07-01	62.1794962098890
2001-10-01	61.5283399272739
2002-01-01	61.6134189368329
2002-04-01	61.4935822842836
2002-07-01	62.0313450697198
2002-10-01	61.6315596765937
2003-01-01	61.4231666267075
2003-04-01	61.8681250740582
2003-07-01	62.6627379818139
2003-10-01	62.7133740831667
2004-01-01	62.1921856824446
2004-04-01	63.1941296698899
2004-07-01	63.5913555318299
2004-10-01	63.4883389451231
2005-01-01	63.0252249047651
2005-04-01	64.0149796150051
2005-07-01	64.7139885775433
2005-10-01	63.7027557738403
2006-01-01	63.6571016851440
2006-04-01	64.9128286495181
2006-07-01	65.2097359358269
2006-10-01	65.2012661139201
2007-01-01	65.4401012655967
2007-04-01	66.0211927385112
2007-07-01	66.7838508325633
2007-10-01	66.5083553210202
2008-01-01	65.8210129794508
2008-04-01	66.9253038387535
2008-07-01	66.7609752406517
2008-10-01	66.3888041641073
2009-01-01	65.9900465288618
2009-04-01	65.7556874703975
2009-07-01	65.7372654155496
2009-10-01	65.4038353414232
2010-01-01	65.5362857733802
2010-04-01	65.3825032443388
2010-07-01	65.6998422020526
2010-10-01	65.4720065538233
2011-01-01	65.7392578884835
2011-04-01	66.3746274839200
2011-07-01	65.5760295391818
2011-10-01	65.8458123635015
2012-01-01	65.3302558863947
2012-04-01	65.2279953744217
2012-07-01	65.4524859054925
2012-10-01	65.9231890950452
2013-01-01	66.6124682545192
2013-04-01	66.3084131414449
2013-07-01	67.0484710972851
2013-10-01	67.7363401963727
2014-01-01	68.1223232405815
2014-04-01	68.5506907337316
2014-07-01	68.9151299774756
2014-10-01	69.2999478153412
2015-01-01	69.6564156224676
2015-04-01	69.4457601071640
2015-07-01	70.6459341257650
2015-10-01	70.8194405683112
2016-01-01	70.8914986491346
2016-04-01	71.1479055668290
2016-07-01	72.0270635817359
2016-10-01	72.1816383272932
2017-01-01	72.6978781295083
2017-04-01	72.9022223995747
2017-07-01	74.0263040314651
2017-10-01	74.1424906947454
2018-01-01	74.7984285622780
2018-04-01	75.1801989558043
2018-07-01	75.3666010067848