Quarter	Percent
1986-01-01	79.0217391304348
1986-04-01	79.4176862319963
1986-07-01	79.1341924531214
1986-10-01	79.1884013501074
1987-01-01	79.2680137247426
1987-04-01	79.7600971758275
1987-07-01	79.6507672537607
1987-10-01	79.7504509921828
1988-01-01	78.1925637764644
1988-04-01	78.4723258242578
1988-07-01	77.2771209755372
1988-10-01	77.8550810450744
1989-01-01	76.6423357664234
1989-04-01	76.0815185403178
1989-07-01	76.4188297404312
1989-10-01	76.3213530655391
1990-01-01	76.0200014493804
1990-04-01	76.1829197922677
1990-07-01	75.6514248797646
1990-10-01	75.8682165014619
1991-01-01	74.8812814515558
1991-04-01	74.8288758732623
1991-07-01	74.2885250509451
1991-10-01	73.9005802978396
1992-01-01	74.0016696813691
1992-04-01	74.7331947331947
1992-07-01	74.0231948087809
1992-10-01	74.3785194341436
1993-01-01	74.1393442622951
1993-04-01	74.4798041615667
1993-07-01	74.2826204656199
1993-10-01	75.1715323557110
1994-01-01	74.8679548037708
1994-04-01	75.9411999467873
1994-07-01	75.4996690933157
1994-10-01	76.5684598184927
1995-01-01	76.5536169378553
1995-04-01	77.2662244765249
1995-07-01	77.5283079909414
1995-10-01	77.5721354668723
1996-01-01	77.5416427340609
1996-04-01	77.9379087042093
1996-07-01	78.2284559009350
1996-10-01	78.0449522852838
1997-01-01	77.0854145854146
1997-04-01	77.3505071246344
1997-07-01	77.4945736434109
1997-10-01	77.4739181430952
1998-01-01	76.7045803873348
1998-04-01	75.8265349935595
1998-07-01	75.9351086623814
1998-10-01	76.5891188862429
1999-01-01	76.4899451553931
1999-04-01	76.7600487210719
1999-07-01	76.9862513687796
1999-10-01	78.1904241762243
2000-01-01	77.8471044342137
2000-04-01	77.6121212121212
2000-07-01	78.4129485935984
2000-10-01	78.9827429609446
2001-01-01	78.6068748487049
2001-04-01	78.5103933094964
2001-07-01	78.6661820825004
2001-10-01	79.6570255419359
2002-01-01	79.2682192934946
2002-04-01	78.8503123498318
2002-07-01	79.1299658457667
2002-10-01	79.9093024643475
2003-01-01	79.2312719063744
2003-04-01	79.0013031631323
2003-07-01	79.5960550404536
2003-10-01	79.8470588235294
2004-01-01	79.6341892367218
2004-04-01	79.9122293739029
2004-07-01	80.5466331834375
2004-10-01	81.3937241660360
2005-01-01	81.0129523145728
2005-04-01	81.0570898120214
2005-07-01	81.9050929949591
2005-10-01	82.0409106668208
2006-01-01	81.4264316165457
2006-04-01	81.9608068501810
2006-07-01	81.9105574372811
2006-10-01	81.4969648379338
2007-01-01	81.6950508629558
2007-04-01	81.8508997429306
2007-07-01	81.6136584251699
2007-10-01	82.2519954389966
2008-01-01	80.7788658619904
2008-04-01	82.0324508966695
2008-07-01	82.0515739739284
2008-10-01	82.2974125675292
2009-01-01	80.7133121308496
2009-04-01	80.9172437280054
2009-07-01	79.9750467872739
2009-10-01	80.2910202695052
2010-01-01	79.8541219043311
2010-04-01	79.7024381965266
2010-07-01	79.9320690631192
2010-10-01	79.9626527840652
2011-01-01	80.2716468590832
2011-04-01	80.5034298996542
2011-07-01	80.1465159861434
2011-10-01	80.6420454545454
2012-01-01	80.1307561114270
2012-04-01	79.6697038724374
2012-07-01	79.2769160583942
2012-10-01	79.7000627245253
2013-01-01	80.2063148295908
2013-04-01	80.1573277090578
2013-07-01	81.1528165404112
2013-10-01	81.7169479006874
2014-01-01	81.6121905625106
2014-04-01	81.5813270035040
2014-07-01	81.8145956607495
2014-10-01	81.9711673304538
2015-01-01	82.0925553319920
2015-04-01	81.7488589558054
2015-07-01	81.0057104840051
2015-10-01	81.8201863182846
2016-01-01	81.9202541351736
2016-04-01	82.9992939003856
2016-07-01	83.4460007571251
2016-10-01	84.0077381911978
2017-01-01	83.6963484945548
2017-04-01	83.6935166994106
2017-07-01	84.4649933949802
2017-10-01	84.6032662920758
2018-01-01	84.4829385369926
2018-04-01	84.5534787123572
2018-07-01	84.8329713517427