Quarter	Percent
1978-04-01	86.9602777666666
1978-07-01	86.2415674666666
1978-10-01	86.6557513333334
1979-01-01	87.1120410333334
1979-04-01	86.5599453000000
1979-07-01	86.2424812333333
1979-10-01	86.5997895666667
1980-01-01	87.0053780333333
1980-04-01	86.5925120666666
1980-07-01	86.5128587000000
1980-10-01	86.7082134000000
1981-01-01	87.1089659666667
1981-04-01	86.4549446000000
1981-07-01	86.3777007333333
1981-10-01	86.1857389000000
1982-01-01	86.6794194000000
1982-04-01	85.7781818000000
1982-07-01	85.6610887333333
1982-10-01	86.0002642666666
1983-01-01	86.0056102000000
1983-04-01	85.1668972666666
1983-07-01	85.0392414333333
1983-10-01	85.0217168333334
1984-01-01	85.5410605666666
1984-04-01	84.9309441666667
1984-07-01	84.6167705666667
1984-10-01	84.3689410333333
1985-01-01	84.8157561333333
1985-04-01	84.1136756333334
1985-07-01	84.2775770333333
1985-10-01	84.5634360000000
1986-01-01	85.2044757666667
1986-04-01	84.7652676666667
1986-07-01	84.5061954666667
1986-10-01	84.6934546000000
1987-01-01	84.9016580333333
1987-04-01	84.3452170666667
1987-07-01	84.1387643333333
1987-10-01	84.0362155333333
1988-01-01	84.7454992333334
1988-04-01	84.4884842333334
1988-07-01	83.8543074666667
1988-10-01	84.2707953000000
1989-01-01	84.6872731000000
1989-04-01	84.5812290333333
1989-07-01	84.6542817666667
1989-10-01	84.8532920000000
1990-01-01	84.9256447000000
1990-04-01	84.9139786000000
1990-07-01	85.0529974000000
1990-10-01	85.1268850000000
1991-01-01	84.8993656000000
1991-04-01	84.2745710666667
1991-07-01	83.6144208333333
1991-10-01	83.9244214666667
1992-01-01	84.2138393000000
1992-04-01	83.6234093333333
1992-07-01	83.6216088333334
1992-10-01	83.5484085666667
1993-01-01	83.8569052000000
1993-04-01	83.1105980333334
1993-07-01	83.0480247000000
1993-10-01	83.6403463666666
1994-01-01	83.9447972666667
1994-04-01	83.2443169333334
1994-07-01	83.3434044333333
1994-10-01	83.4920023000000
1995-01-01	83.9809338666666
1995-04-01	83.6153437333333
1995-07-01	83.7443092000000
1995-10-01	83.9309963666666
1996-01-01	84.1475473666667
1996-04-01	83.5217365333334
1996-07-01	83.5349007666667
1996-10-01	83.5780177000000
1997-01-01	83.7586397666666
1997-04-01	82.9336657333333
1997-07-01	82.6453744666667
1997-10-01	83.0081698000000
1998-01-01	83.1677811666667
1998-04-01	82.7313791666667
1998-07-01	82.7733241333333
1998-10-01	82.7591324666667
1999-01-01	82.7512902333333
1999-04-01	82.3239721333333
1999-07-01	82.4160355000000
1999-10-01	82.4957796000000
2000-01-01	82.3621998333333
2000-04-01	82.2493058333334
2000-07-01	82.3911445666666
2000-10-01	82.3029672666667
2001-01-01	82.0743591333334
2001-04-01	82.1711164666666
2001-07-01	82.1733768333333
2001-10-01	82.3167369666667
2002-01-01	82.4606472333333
2002-04-01	82.1229118666667
2002-07-01	81.8466767666667
2002-10-01	82.1742510000000
2003-01-01	82.5125275000000
2003-04-01	81.7265261666667
2003-07-01	81.5313568666667
2003-10-01	82.1068463333334
2004-01-01	82.2181863333333
2004-04-01	81.9967374333334
2004-07-01	81.7062193666667
2004-10-01	82.1322219000000
2005-01-01	82.5608804666666
2005-04-01	82.6985985333333
2005-07-01	82.5503560333333
2005-10-01	82.6594370333333
2006-01-01	82.8373740666667
2006-04-01	82.5404295000000
2006-07-01	82.7937131333333
2006-10-01	82.8045981666667
2007-01-01	82.9240627666667
2007-04-01	82.9398675333333
2007-07-01	82.8107290666667
2007-10-01	83.1833933333334
2008-01-01	83.2760848333333
2008-04-01	83.1327334333333
2008-07-01	82.7949867000000
2008-10-01	82.9779549333334
2009-01-01	82.9590948000000
2009-04-01	82.6576202333333
2009-07-01	82.2678282000000
2009-10-01	82.5663887000000
2010-01-01	82.9874448000000
2010-04-01	82.6480128000000
2010-07-01	82.6320864666667
2010-10-01	83.3214811000000
2011-01-01	83.3686748666667
2011-04-01	82.7314819333333
2011-07-01	82.5706580666667
2011-10-01	82.7013158666666
2012-01-01	82.6946567000000
2012-04-01	82.3677826666667
2012-07-01	82.2436754000000
2012-10-01	82.6137075333334
2013-01-01	82.7708863000000
2013-04-01	82.5039005666667
2013-07-01	82.0733856000000
2013-10-01	82.1757485666667
2014-01-01	82.2400385666666
2014-04-01	81.9746061000000
2014-07-01	81.9106483000000
2014-10-01	82.3444121000000
2015-01-01	83.0260477000000
2015-04-01	82.6616810333334
2015-07-01	82.3776583333333
2015-10-01	82.6885938333334
2016-01-01	82.9073983000000
2016-04-01	82.3130664666667
2016-07-01	81.8461030333333
2016-10-01	82.2546624000000
2017-01-01	82.4908537000000
2017-04-01	82.5815689666667
2017-07-01	82.4345437666666
2017-10-01	82.9127847000000
2018-01-01	83.1896104333333
2018-04-01	82.8947473666666
2018-07-01	82.5457341333334