Quarter	Percent
1986-01-01	32.8657314629258
1986-04-01	32.0995238826601
1986-07-01	32.0232451445175
1986-10-01	32.3962923567847
1987-01-01	32.2010869565217
1987-04-01	31.1448317307692
1987-07-01	30.8014354066986
1987-10-01	30.4160475482912
1988-01-01	31.9189828503844
1988-04-01	30.9902740937224
1988-07-01	31.0279001468429
1988-10-01	31.3367421475530
1989-01-01	31.8300843759092
1989-04-01	32.2983168891468
1989-07-01	31.5310105537083
1989-10-01	31.4511494252874
1990-01-01	31.7435384835071
1990-04-01	31.0864618885097
1990-07-01	31.0174048393944
1990-10-01	30.3119730185497
1991-01-01	29.9483168040229
1991-04-01	29.7496522948540
1991-07-01	30.1675204208778
1991-10-01	30.6240528998485
1992-01-01	30.1850582590816
1992-04-01	29.5684239278886
1992-07-01	30.4720446197796
1992-10-01	29.6075778078484
1993-01-01	30.5974165769645
1993-04-01	30.0522298111691
1993-07-01	30.2812208449953
1993-10-01	29.8264210944746
1994-01-01	29.4233807266983
1994-04-01	29.4957432874918
1994-07-01	29.4723127035831
1994-10-01	28.3846751229614
1995-01-01	28.9571814324290
1995-04-01	28.3813179782470
1995-07-01	28.1114787477730
1995-10-01	28.3746208291203
1996-01-01	27.7429073562641
1996-04-01	26.9379603045812
1996-07-01	26.2883397491618
1996-10-01	27.3344023683237
1997-01-01	27.9794016674841
1997-04-01	27.5647288715193
1997-07-01	27.3600973236010
1997-10-01	27.9680503449110
1998-01-01	27.7503313652247
1998-04-01	28.1715521383950
1998-07-01	28.0306660277911
1998-10-01	27.2119402985075
1999-01-01	27.3008691510894
1999-04-01	26.8402901652991
1999-07-01	26.8162393162393
1999-10-01	26.2454147438173
2000-01-01	26.3990554899646
2000-04-01	27.3371104815864
2000-07-01	26.3772561047540
2000-10-01	26.1130742049470
2001-01-01	26.0997412373559
2001-04-01	26.1862710467444
2001-07-01	26.1411764705882
2001-10-01	24.8094735607926
2002-01-01	25.2395419490535
2002-04-01	26.0144589552239
2002-07-01	25.4302325581395
2002-10-01	24.7047927761056
2003-01-01	25.9711815561960
2003-04-01	25.9565667011375
2003-07-01	24.9370277078086
2003-10-01	24.9202006383949
2004-01-01	25.1220897217490
2004-04-01	26.1810354593860
2004-07-01	25.0875805175726
2004-10-01	24.2482261515936
2005-01-01	24.4776454729274
2005-04-01	24.2849130678632
2005-07-01	23.4688164819169
2005-10-01	23.9169271996427
2006-01-01	23.7591809481416
2006-04-01	23.3263017652937
2006-07-01	23.4446046356881
2006-10-01	24.4913754975674
2007-01-01	23.4443954104148
2007-04-01	23.5144967478779
2007-07-01	24.2674597929059
2007-10-01	23.0371673630965
2008-01-01	24.3329307126386
2008-04-01	22.9367866549605
2008-07-01	22.0491443615621
2008-10-01	21.9277108433735
2009-01-01	22.4677313498140
2009-04-01	22.6388281591605
2009-07-01	23.0131004366812
2009-10-01	22.7148926898355
2010-01-01	23.2651729388732
2010-04-01	23.6893626278007
2010-07-01	23.7597911227154
2010-10-01	23.5677791064246
2011-01-01	22.6388436039561
2011-04-01	22.6525949298226
2011-07-01	22.7644047489380
2011-10-01	22.3009042379344
2012-01-01	22.4850136239782
2012-04-01	22.6647752073330
2012-07-01	22.4904423812125
2012-10-01	23.2306684141547
2013-01-01	22.2222222222222
2013-04-01	22.8031874249536
2013-07-01	21.5095986038394
2013-10-01	20.9993468321359
2014-01-01	20.9623112848919
2014-04-01	22.0451095207113
2014-07-01	20.4479065238559
2014-10-01	20.5625606207565
2015-01-01	20.4039969915118
2015-04-01	21.1134903640257
2015-07-01	21.7655849701110
2015-10-01	21.2942301562002
2016-01-01	20.6845552503697
2016-04-01	19.8802143532626
2016-07-01	19.3048576214405
2016-10-01	18.2509109838626
2017-01-01	18.2815734989648
2017-04-01	19.3279043397588
2017-07-01	17.9689906561249
2017-10-01	17.9775280898876
2018-01-01	18.0922389272653
2018-04-01	17.6214574898785
2018-07-01	17.8203834510595