Quarter	Percent
1986-01-01	59.7692862292718
1986-04-01	59.8179688204019
1986-07-01	59.9423631123919
1986-10-01	60.5943616448195
1987-01-01	60.3795542028466
1987-04-01	60.8065814182241
1987-07-01	60.6179674941954
1987-10-01	61.4569418470033
1988-01-01	59.9413385476846
1988-04-01	59.4666666666667
1988-07-01	58.6332533546610
1988-10-01	59.1929046563193
1989-01-01	57.3972360028349
1989-04-01	56.7795108117689
1989-07-01	57.0277211938712
1989-10-01	57.8631346578366
1990-01-01	57.8419292378102
1990-04-01	58.8452412338518
1990-07-01	58.0775302578495
1990-10-01	58.3296933694418
1991-01-01	57.3803307223673
1991-04-01	57.3128365468126
1991-07-01	56.9038744907688
1991-10-01	57.2119955060064
1992-01-01	56.5554693560900
1992-04-01	57.3076260974350
1992-07-01	56.7978686833964
1992-10-01	57.7206512425021
1993-01-01	56.9317502349022
1993-04-01	57.0454351717671
1993-07-01	57.8598162640354
1993-10-01	58.5522969994914
1994-01-01	58.5155788229334
1994-04-01	58.9003031323678
1994-07-01	59.5096145772105
1994-10-01	60.9331883936784
1995-01-01	60.3363583381900
1995-04-01	61.0294728102947
1995-07-01	61.6880430285478
1995-10-01	62.1757391089517
1996-01-01	62.1506433898861
1996-04-01	62.9206141783731
1996-07-01	63.4624776167996
1996-10-01	62.9050550874919
1997-01-01	62.1340430679894
1997-04-01	62.3260677229952
1997-07-01	62.3054708807958
1997-10-01	62.4780175859312
1998-01-01	61.5605323981828
1998-04-01	61.1553150859325
1998-07-01	61.7742832181717
1998-10-01	62.0148899097101
1999-01-01	62.0733249051833
1999-04-01	62.1043491988318
1999-07-01	62.5088645496809
1999-10-01	63.3699921445404
2000-01-01	62.5293841090738
2000-04-01	62.0851596743895
2000-07-01	63.3976713292178
2000-10-01	64.4510247019403
2001-01-01	63.6568497940788
2001-04-01	64.3112284516229
2001-07-01	64.0551211581636
2001-10-01	65.6993303055962
2002-01-01	64.7949816401469
2002-04-01	64.7811191473163
2002-07-01	64.7455316570736
2002-10-01	65.6835452561884
2003-01-01	64.6069934249851
2003-04-01	64.7696879643388
2003-07-01	65.9005247210110
2003-10-01	66.3139329805996
2004-01-01	65.4700979675391
2004-04-01	64.7512926953609
2004-07-01	66.0354085038456
2004-10-01	67.8029755886176
2005-01-01	66.6402934618428
2005-04-01	66.8841878809609
2005-07-01	67.9010580497569
2005-10-01	68.2640273426374
2006-01-01	67.9214518644548
2006-04-01	68.2068673166596
2006-07-01	67.8485831101086
2006-10-01	67.8704419307244
2007-01-01	68.3620568866470
2007-04-01	68.5886222097824
2007-07-01	67.8823447215818
2007-10-01	69.6021737615830
2008-01-01	67.3245309242530
2008-04-01	68.6186082009297
2008-07-01	68.9803269603768
2008-10-01	69.4168048645661
2009-01-01	67.8017508788860
2009-04-01	67.0886075949367
2009-07-01	66.8930972965555
2009-10-01	67.2934901531729
2010-01-01	66.6212162530679
2010-04-01	66.3330610021786
2010-07-01	66.1680717976611
2010-10-01	66.9877883310719
2011-01-01	66.9578762020859
2011-04-01	67.0412238543288
2011-07-01	66.6666666666667
2011-10-01	67.7212194957074
2012-01-01	66.9820245979186
2012-04-01	67.0947681492497
2012-07-01	66.9189700614990
2012-10-01	66.3201242152164
2013-01-01	67.1723300970874
2013-04-01	67.1045540285637
2013-07-01	67.7942165433759
2013-10-01	68.8748826605874
2014-01-01	68.8836898395722
2014-04-01	68.1354576361576
2014-07-01	68.8438538205980
2014-10-01	70.3862944833973
2015-01-01	69.7119504317448
2015-04-01	68.9575948536169
2015-07-01	68.4041857423152
2015-10-01	69.6936186821050
2016-01-01	69.7406712798293
2016-04-01	70.3877564143785
2016-07-01	70.5475504322766
2016-10-01	71.8970897280774
2017-01-01	71.5425531914894
2017-04-01	71.1078882653383
2017-07-01	72.2047738693467
2017-10-01	73.2824904669626
2018-01-01	72.8726051256532
2018-04-01	72.8427969253657
2018-07-01	73.5644971877125