Quarter	Percent
1986-01-01	49.2597577388964
1986-04-01	50.2691790040377
1986-07-01	50.4883799259010
1986-10-01	48.9720256150994
1987-01-01	48.7343908201148
1987-04-01	47.6335361730899
1987-07-01	48.1732070365359
1987-10-01	47.6641841570752
1988-01-01	48.2548288715690
1988-04-01	46.5534804753820
1988-07-01	45.3555631167064
1988-10-01	45.2624403544649
1989-01-01	43.8716285421646
1989-04-01	44.0683760683761
1989-07-01	43.1997259335389
1989-10-01	42.9845626072041
1990-01-01	43.4707903780069
1990-04-01	44.0578711677575
1990-07-01	43.7543133195307
1990-10-01	43.4001382170007
1991-01-01	43.4105845728122
1991-04-01	44.0290758047767
1991-07-01	44.0055440055440
1991-10-01	44.0360610263523
1992-01-01	44.3789035392089
1992-04-01	44.3248871919472
1992-07-01	44.3248871919472
1992-10-01	44.7952810548230
1993-01-01	45.4576976421637
1993-04-01	47.3812001387444
1993-07-01	47.8848821081831
1993-10-01	47.7162629757786
1994-01-01	48.3080110497238
1994-04-01	48.9648033126294
1994-07-01	49.3457300275482
1994-10-01	51.3374485596708
1995-01-01	51.1786812435941
1995-04-01	51.3964577656676
1995-07-01	51.7953929539295
1995-10-01	53.2323232323232
1996-01-01	54.8408710217755
1996-04-01	55.8705803869246
1996-07-01	55.9310801855534
1996-10-01	56.0157790927022
1997-01-01	56.9285947179654
1997-04-01	57.0550161812298
1997-07-01	56.5776777098746
1997-10-01	55.9322033898305
1998-01-01	57.0019096117123
1998-04-01	58.1299524564184
1998-07-01	58.4566929133858
1998-10-01	58.8382261086821
1999-01-01	60.4896188410288
1999-04-01	59.7230769230769
1999-07-01	59.8105134474328
1999-10-01	58.3560812860176
2000-01-01	57.8693951248872
2000-04-01	58.5147628988965
2000-07-01	60.7026867434308
2000-10-01	61.5857226448215
2001-01-01	61.8150188460423
2001-04-01	61.8129496402878
2001-07-01	63.2687927107062
2001-10-01	63.4858265506596
2002-01-01	64.2600276625173
2002-04-01	65.8743169398907
2002-07-01	65.7397408207344
2002-10-01	65.5383795309168
2003-01-01	65.4818325434439
2003-04-01	67.0312500000000
2003-07-01	66.6666666666667
2003-10-01	67.8125795772855
2004-01-01	66.8850806451613
2004-04-01	68.6719920119820
2004-07-01	69.4781103141232
2004-10-01	69.9264705882353
2005-01-01	70.3155339805825
2005-04-01	70.0939080183000
2005-07-01	71.2440191387560
2005-10-01	71.7272511285341
2006-01-01	71.6576279179439
2006-04-01	72.5164011246486
2006-07-01	70.9527137200093
2006-10-01	70.8140610545791
2007-01-01	72.8003675626005
2007-04-01	73.4582000913659
2007-07-01	72.4364791288566
2007-10-01	72.7129692065633
2008-01-01	73.0409617097061
2008-04-01	73.0123674911661
2008-07-01	73.0583589293550
2008-10-01	73.1925087108014
2009-01-01	73.8172391445236
2009-04-01	74.2385242385242
2009-07-01	74.0843270868824
2009-10-01	75.0633445945946
2010-01-01	74.7957259585166
2010-04-01	76.0883149343886
2010-07-01	76.0149130074565
2010-10-01	75.7606907894737
2011-01-01	75.6326530612245
2011-04-01	75.5222064489961
2011-07-01	75.8523300383296
2011-10-01	76.6974688629972
2012-01-01	77.0278389745644
2012-04-01	76.9415052904771
2012-07-01	77.0883054892601
2012-10-01	75.8566052683700
2013-01-01	76.5239692246992
2013-04-01	77.7122641509434
2013-07-01	77.0931142410016
2013-10-01	77.2462077012835
2014-01-01	78.7081802359312
2014-04-01	78.3503172466833
2014-07-01	77.9583253679985
2014-10-01	79.0383884454580
2015-01-01	78.5903250188964
2015-04-01	78.0052592036063
2015-07-01	77.2286460276016
2015-10-01	77.4259259259259
2016-01-01	77.5694061408347
2016-04-01	79.3978102189781
2016-07-01	78.7395871061210
2016-10-01	78.5727125651627
2017-01-01	80.4782298358316
2017-04-01	79.9645704162976
2017-07-01	80.6054206265400
2017-10-01	80.9024134312697
2018-01-01	80.3611738148984
2018-04-01	80.4554079696395
2018-07-01	80.1508399040110