Quarter	Percent
1986-01-01	67.2086720867209
1986-04-01	66.5764546684709
1986-07-01	66.5087956698241
1986-10-01	63.4394041976980
1987-01-01	64.3195666892349
1987-04-01	62.9654705484089
1987-07-01	63.1008801624915
1987-10-01	61.2051455653351
1988-01-01	62.3306233062331
1988-04-01	58.8873812754410
1988-07-01	56.3265306122449
1988-10-01	56.1989100817439
1989-01-01	54.2662116040956
1989-04-01	54.2349726775956
1989-07-01	53.5567715458276
1989-10-01	54.3150684931507
1990-01-01	54.6264564770391
1990-04-01	53.7087912087912
1990-07-01	53.6820371644873
1990-10-01	52.8236914600551
1991-01-01	53.2781228433402
1991-04-01	53.2458563535912
1991-07-01	52.5951557093426
1991-10-01	53.0838530838531
1992-01-01	52.7739251040222
1992-04-01	52.3611111111111
1992-07-01	51.4603616133519
1992-10-01	51.5994436717663
1993-01-01	53.1619179986101
1993-04-01	55.9498956158664
1993-07-01	56.1196105702364
1993-10-01	56.4583333333333
1994-01-01	57.2418572418572
1994-04-01	58.5872576177285
1994-07-01	59.2387543252595
1994-10-01	61.0613370089593
1995-01-01	61.8818681318681
1995-04-01	61.7808219178082
1995-07-01	63.0108991825613
1995-10-01	63.9810426540284
1996-01-01	65.8355795148248
1996-04-01	65.4362416107382
1996-07-01	65.1767845230154
1996-10-01	66.2913907284768
1997-01-01	65.1773981603154
1997-04-01	67.2323759791123
1997-07-01	65.6716417910448
1997-10-01	65.1612903225806
1998-01-01	66.7951188182402
1998-04-01	67.2855313700384
1998-07-01	66.7514303877940
1998-10-01	66.1412358133670
1999-01-01	67.7096370463079
1999-04-01	67.6196395276569
1999-07-01	66.6049382716049
1999-10-01	66.8504901960784
2000-01-01	67.1332927571516
2000-04-01	66.7471333735667
2000-07-01	67.6435406698565
2000-10-01	70.0236966824645
2001-01-01	70.4638872577804
2001-04-01	70.3552708211998
2001-07-01	70.0864553314121
2001-10-01	71.9477569562748
2002-01-01	74.2025741466144
2002-04-01	74.7927031509121
2002-07-01	74.6586564718733
2002-10-01	74.4875943905070
2003-01-01	72.5093233883857
2003-04-01	73.3930453108535
2003-07-01	73.2673267326733
2003-10-01	74.1885625965997
2004-01-01	73.7003058103976
2004-04-01	76.0222110045432
2004-07-01	76.5500000000000
2004-10-01	78.4440039643211
2005-01-01	77.6522593320236
2005-04-01	77.7777777777778
2005-07-01	77.9932137663597
2005-10-01	78.7193066923447
2006-01-01	78.8718929254302
2006-04-01	80.1330798479088
2006-07-01	79.6786389413989
2006-10-01	79.4462693571094
2007-01-01	81.1567164179104
2007-04-01	80.8066759388039
2007-07-01	79.8802946593002
2007-10-01	80.8394160583942
2008-01-01	79.8463624039765
2008-04-01	79.8922800718133
2008-07-01	79.1350869371378
2008-10-01	80.4694419840567
2009-01-01	80.1318681318681
2009-04-01	80.1310043668122
2009-07-01	78.7602947550932
2009-10-01	78.9586919104991
2010-01-01	79.3339026473100
2010-04-01	79.2356687898089
2010-07-01	80.2364864864865
2010-10-01	78.9341166596727
2011-01-01	79.9166666666667
2011-04-01	79.1632145816073
2011-07-01	80.5028854080791
2011-10-01	80.7802874743326
2012-01-01	80.9094633346989
2012-04-01	80.0899427636958
2012-07-01	78.3211083944580
2012-10-01	79.0093382054405
2013-01-01	78.9963577498988
2013-04-01	80.1049233252623
2013-07-01	78.5140562248996
2013-10-01	79.5445465441470
2014-01-01	80.7631160572337
2014-04-01	81.0201660735469
2014-07-01	80.2833530106257
2014-10-01	80.9784735812133
2015-01-01	80.8096535616972
2015-04-01	80.6039488966318
2015-07-01	80.2692307692308
2015-10-01	80.2902979373568
2016-01-01	80.2961275626424
2016-04-01	81.5373021853806
2016-07-01	81.9610778443114
2016-10-01	82.8316610925306
2017-01-01	84.3484680693983
2017-04-01	83.4371564675706
2017-07-01	84.5173041894354
2017-10-01	85.2696344553022
2018-01-01	84.2862279755484
2018-04-01	84.8766535573829
2018-07-01	84.6837242359630