Quarter	Percent
1986-01-01	67.1650994296285
1986-04-01	67.9004761173399
1986-07-01	67.9920477137177
1986-10-01	67.6189029022945
1987-01-01	67.7989130434783
1987-04-01	68.8401442307692
1987-07-01	69.2284688995215
1987-10-01	69.5542347696880
1988-01-01	68.0810171496156
1988-04-01	68.9802534630121
1988-07-01	68.9574155653451
1988-10-01	68.6340394448503
1989-01-01	68.1408204829793
1989-04-01	67.7161926871735
1989-07-01	68.4545323116958
1989-10-01	68.5201149425287
1990-01-01	68.2564615164929
1990-04-01	68.9419795221843
1990-07-01	69.0108957124664
1990-10-01	69.7020798201237
1991-01-01	70.0516831959771
1991-04-01	70.2642559109875
1991-07-01	69.7771009275924
1991-10-01	69.3759471001515
1992-01-01	69.8012337217272
1992-04-01	70.4315760721114
1992-07-01	69.5279553802204
1992-10-01	70.4059539918809
1993-01-01	69.3891280947255
1993-04-01	69.9611624481050
1993-07-01	69.7054511528722
1993-10-01	70.1868292036571
1994-01-01	70.5766192733018
1994-04-01	70.4911591355599
1994-07-01	70.5276872964169
1994-10-01	71.6023815687290
1995-01-01	71.0299601388710
1995-04-01	71.6314779270634
1995-07-01	71.8757953677781
1995-10-01	71.6253791708797
1996-01-01	72.2696459954808
1996-04-01	73.0370740232181
1996-07-01	73.7116602508382
1996-10-01	72.6532626125570
1997-01-01	72.0083374203041
1997-04-01	72.4352711284807
1997-07-01	72.6399026763990
1997-10-01	72.0319496550890
1998-01-01	72.2376189902398
1998-04-01	71.8284478616050
1998-07-01	71.9333972208912
1998-10-01	72.8000000000000
1999-01-01	72.6872246696035
1999-04-01	73.1478178142466
1999-07-01	73.1718898385565
1999-10-01	73.7427523370015
2000-01-01	73.6009445100354
2000-04-01	72.6392823418319
2000-07-01	73.6227438952460
2000-10-01	73.8751472320377
2001-01-01	73.8884968242766
2001-04-01	73.8019545508066
2001-07-01	73.8470588235294
2001-10-01	75.2022511431586
2002-01-01	74.7721430240710
2002-04-01	73.9855410447761
2002-07-01	74.5697674418605
2002-10-01	75.2836304700162
2003-01-01	74.0403458213256
2003-04-01	74.0664138802712
2003-07-01	75.0744217998626
2003-10-01	75.0797993616051
2004-01-01	74.8779102782510
2004-04-01	73.8189645406140
2004-07-01	74.8898180585377
2004-10-01	75.7517738484064
2005-01-01	75.5448213884520
2005-04-01	75.7150869321368
2005-07-01	76.4975926547979
2005-10-01	76.0830728003573
2006-01-01	76.2408190518584
2006-04-01	76.6625957588542
2006-07-01	76.5775756903626
2006-10-01	75.4865103936311
2007-01-01	76.5556045895852
2007-04-01	76.4744791092493
2007-07-01	75.7325402070941
2007-10-01	76.9738288981746
2008-01-01	75.7000109805644
2008-04-01	77.0522388059701
2008-07-01	77.9727950855638
2008-10-01	78.0722891566265
2009-01-01	77.5322686501860
2009-04-01	77.3611718408396
2009-07-01	76.9759825327511
2009-10-01	77.2960017431093
2010-01-01	76.7348270611268
2010-04-01	76.2997607135088
2010-07-01	76.2510879025239
2010-10-01	76.4430916403957
2011-01-01	77.3720247799152
2011-04-01	77.3256446523773
2011-07-01	77.2355952510620
2011-10-01	77.7208846279551
2012-01-01	77.5258855585831
2012-04-01	77.3352247926670
2012-07-01	77.4986346258875
2012-10-01	76.7693315858454
2013-01-01	77.7450338354071
2013-04-01	77.1858967361642
2013-07-01	78.5013089005236
2013-10-01	78.9897670367951
2014-01-01	79.0268274139242
2014-04-01	77.9548904792887
2014-07-01	79.5412744779834
2014-10-01	79.4374393792434
2015-01-01	79.5530246051359
2015-04-01	78.8865096359743
2015-07-01	78.2344150298890
2015-10-01	78.7270215705026
2016-01-01	79.2943165011621
2016-04-01	80.1197856467374
2016-07-01	80.6846733668342
2016-10-01	81.7386777719938
2017-01-01	81.7080745341615
2017-04-01	80.6720956602412
2017-07-01	82.0515453331964
2017-10-01	82.0326864147089
2018-01-01	81.8874441284031
2018-04-01	82.3684210526316
2018-07-01	82.1997981836529