Quarter	Percent
1978-04-01	95.1359890530468
1978-07-01	94.7280905658528
1978-10-01	95.0393075371627
1979-01-01	94.7790478591510
1979-04-01	95.0293634242300
1979-07-01	94.7130754025385
1979-10-01	94.6795859840726
1980-01-01	94.5339037822812
1980-04-01	94.5475887219076
1980-07-01	94.7409575925734
1980-10-01	94.6362106365660
1981-01-01	94.3707889110620
1981-04-01	94.3261472515185
1981-07-01	94.4773785851624
1981-10-01	94.0573023304312
1982-01-01	94.0745041513832
1982-04-01	94.0658434163469
1982-07-01	94.1168033481893
1982-10-01	94.2839135517293
1983-01-01	94.0278902791742
1983-04-01	94.0860477623470
1983-07-01	94.3698466246279
1983-10-01	93.9578941633688
1984-01-01	94.1488837471136
1984-04-01	94.1195150819826
1984-07-01	93.9520656886727
1984-10-01	93.5948272493104
1985-01-01	93.4284307970702
1985-04-01	93.2650954977569
1985-07-01	93.5921501102214
1985-10-01	93.4947773817078
1986-01-01	93.5825716834884
1986-04-01	93.5180553687698
1986-07-01	93.7796969344752
1986-10-01	93.5638711678540
1987-01-01	93.4261793348525
1987-04-01	93.3957493225314
1987-07-01	93.4831726186100
1987-10-01	92.8442689603906
1988-01-01	92.9409824233461
1988-04-01	93.3448477216912
1988-07-01	92.7818927882374
1988-10-01	93.1224842774993
1989-01-01	92.6377170161609
1989-04-01	93.0374263938603
1989-07-01	92.9735372333781
1989-10-01	93.1014067869955
1990-01-01	93.0461341706742
1990-04-01	93.4060733782579
1990-07-01	93.4968526298417
1990-10-01	93.1518274681030
1991-01-01	93.1540600047625
1991-04-01	93.3043124967560
1991-07-01	93.0664966856921
1991-10-01	92.7845939107448
1992-01-01	92.5353008740540
1992-04-01	92.5005793708454
1992-07-01	92.3971558197517
1992-10-01	92.3183692428912
1993-01-01	92.2506667928796
1993-04-01	92.2709981748017
1993-07-01	92.2504666389409
1993-10-01	92.1941672692886
1994-01-01	91.5945652307327
1994-04-01	91.6495826557794
1994-07-01	91.8052994016556
1994-10-01	91.3448782282247
1995-01-01	91.5215999986289
1995-04-01	91.6510780829812
1995-07-01	91.8599436740335
1995-10-01	91.8531506628126
1996-01-01	91.8226783296719
1996-04-01	91.5923538260467
1996-07-01	91.6155169517522
1996-10-01	91.2719877166669
1997-01-01	91.2066864870480
1997-04-01	91.0271772359004
1997-07-01	91.1205789168635
1997-10-01	90.9012192303070
1998-01-01	90.8440159385760
1998-04-01	90.7688464409136
1998-07-01	90.9068826330123
1998-10-01	90.7092298223217
1999-01-01	90.5730889603388
1999-04-01	90.4954631955564
1999-07-01	90.4165209235468
1999-10-01	90.2314897609691
2000-01-01	89.9342977032460
2000-04-01	90.2812851797972
2000-07-01	90.4654391509037
2000-10-01	90.2140551864885
2001-01-01	89.8428185578780
2001-04-01	90.2708328407424
2001-07-01	90.2287660610751
2001-10-01	90.2064543260765
2002-01-01	90.1346342227727
2002-04-01	90.3757254786940
2002-07-01	90.0867722051568
2002-10-01	90.1190699076194
2003-01-01	90.1223166036623
2003-04-01	89.8196377466156
2003-07-01	89.6221864036226
2003-10-01	89.8139962653026
2004-01-01	89.8419066111461
2004-04-01	89.9125756226215
2004-07-01	89.7855518009852
2004-10-01	89.9531078960599
2005-01-01	90.0777497279238
2005-04-01	90.4014692709004
2005-07-01	90.4520520153916
2005-10-01	90.3116291083227
2006-01-01	90.1774706589391
2006-04-01	90.2188403240592
2006-07-01	90.5253334570896
2006-10-01	90.3953558931126
2007-01-01	90.3988580654726
2007-04-01	90.7879727222648
2007-07-01	90.9498679865737
2007-10-01	90.9960986268901
2008-01-01	90.9634936790100
2008-04-01	90.9628484768809
2008-07-01	90.8924381502778
2008-10-01	90.9138110120672
2009-01-01	90.2940616477267
2009-04-01	90.4305831813672
2009-07-01	90.3280798439670
2009-10-01	90.3646658237790
2010-01-01	90.4067689336010
2010-04-01	90.3421497224891
2010-07-01	90.5700807073068
2010-10-01	90.9316777947064
2011-01-01	90.7906613613876
2011-04-01	90.6198474487571
2011-07-01	90.5009156309460
2011-10-01	90.4875220044760
2012-01-01	90.3261162212301
2012-04-01	90.1292784305973
2012-07-01	90.0798306532826
2012-10-01	90.0133039578219
2013-01-01	90.1676141534948
2013-04-01	90.2520808267966
2013-07-01	90.0117630878647
2013-10-01	90.1212390249410
2014-01-01	89.8994701940594
2014-04-01	89.8785174949942
2014-07-01	89.8257194677030
2014-10-01	89.8463771487854
2015-01-01	90.4223527063219
2015-04-01	90.2835830759866
2015-07-01	90.3669421312850
2015-10-01	90.1150147047143
2016-01-01	90.2688411176771
2016-04-01	90.0612497612673
2016-07-01	89.9790644315524
2016-10-01	90.3127306008691
2017-01-01	90.1813094941985
2017-04-01	90.3863583742649
2017-07-01	90.1855302868677
2017-10-01	90.5079032074250
2018-01-01	90.3783614045876
2018-04-01	90.5558662890567
2018-07-01	90.2526671161669