Quarter	Percent
1986-01-01	30.3475935828877
1986-04-01	32.7978580990629
1986-07-01	32.9758713136729
1986-10-01	32.6174496644295
1987-01-01	31.3593539703903
1987-04-01	30.7017543859649
1987-07-01	31.1697092630156
1987-10-01	32.3848238482385
1988-01-01	32.2711864406780
1988-04-01	31.9972826086956
1988-07-01	31.5861130020422
1988-10-01	30.9686221009550
1989-01-01	29.8701298701299
1989-04-01	30.3901437371663
1989-07-01	29.6778615490062
1989-10-01	28.1786941580756
1990-01-01	28.7388008270158
1990-04-01	30.1795580110497
1990-07-01	29.6885813148789
1990-10-01	29.1060291060291
1991-01-01	29.0367290367290
1991-04-01	29.9791811242193
1991-07-01	30.2777777777778
1991-10-01	30.3955586398334
1992-01-01	30.6250000000000
1992-04-01	30.4649548924358
1992-07-01	31.2066574202496
1992-10-01	31.5096952908587
1993-01-01	32.3183391003460
1993-04-01	33.7024221453287
1993-07-01	34.3706777316736
1993-10-01	33.7241379310345
1994-01-01	33.8609772883689
1994-04-01	34.7766323024055
1994-07-01	35.1610692254969
1994-10-01	37.3378839590444
1995-01-01	37.0068027210884
1995-04-01	37.6949152542373
1995-07-01	37.5843454790823
1995-10-01	39.0488948425988
1996-01-01	40.1732178547635
1996-04-01	42.3740053050398
1996-07-01	42.2924901185771
1996-10-01	41.9333768778576
1997-01-01	43.8834951456311
1997-04-01	42.0038535645472
1997-07-01	43.6224489795918
1997-10-01	42.4223208623970
1998-01-01	42.6498422712934
1998-04-01	44.1305712492153
1998-07-01	44.3820224719101
1998-10-01	45.6683168316832
1999-01-01	46.5930018416206
1999-04-01	47.1663619744058
1999-07-01	45.7955232909861
1999-10-01	44.8979591836735
2000-01-01	43.2142857142857
2000-04-01	44.9292452830189
2000-07-01	47.9276123759486
2000-10-01	48.1502890173410
2001-01-01	49.0263459335624
2001-04-01	48.9761092150171
2001-07-01	51.1261261261261
2001-10-01	51.6379789006108
2002-01-01	49.7264770240700
2002-04-01	52.9983792544570
2002-07-01	53.1767218366257
2002-10-01	52.7675276752768
2003-01-01	53.3298647242456
2003-04-01	55.4297478126608
2003-07-01	56.3423331635252
2003-10-01	56.8982880161128
2004-01-01	55.8823529411765
2004-04-01	58.2015810276680
2004-07-01	59.3245227606461
2004-10-01	59.0887057682986
2005-01-01	60.5086372360844
2005-04-01	59.2574964302713
2005-07-01	62.0037807183365
2005-10-01	62.8517823639775
2006-01-01	60.6793857608190
2006-04-01	61.9223659889094
2006-07-01	59.5959595959596
2006-10-01	60.9211126310990
2007-01-01	62.1376811594203
2007-04-01	64.0990990990991
2007-07-01	63.5062611806798
2007-10-01	63.0926007975188
2008-01-01	63.4370889960544
2008-04-01	63.8973466724663
2008-07-01	63.9896373056995
2008-10-01	63.2548179871520
2009-01-01	63.5089209855565
2009-04-01	64.2074198988196
2009-07-01	64.7427854454203
2009-10-01	66.6113645790129
2010-01-01	66.4747017688194
2010-04-01	67.8250204415372
2010-07-01	66.4500406173842
2010-10-01	67.8629032258064
2011-01-01	67.1200000000000
2011-04-01	67.2228843861740
2011-07-01	67.2856578427499
2011-10-01	68.0298859614628
2012-01-01	68.2601880877743
2012-04-01	68.8134270101483
2012-07-01	69.4250194250194
2012-10-01	66.9501352918438
2013-01-01	68.5912240184758
2013-04-01	70.0268302031430
2013-07-01	69.8436904308044
2013-10-01	70.1402046229632
2014-01-01	71.5254237288136
2014-04-01	71.0063598952488
2014-07-01	71.8959107806691
2014-10-01	72.9959364610270
2015-01-01	70.6681350954479
2015-04-01	70.9124087591241
2015-07-01	69.0942028985507
2015-10-01	70.3916636722961
2016-01-01	70.0427960057061
2016-04-01	72.1868365180467
2016-07-01	70.5861705861706
2016-10-01	70.7520891364902
2017-01-01	72.1492743607464
2017-04-01	72.2908093278464
2017-07-01	72.5136239782016
2017-10-01	72.8102806898884
2018-01-01	72.3640026863667
2018-04-01	72.4333333333334
2018-07-01	72.7061941040080