Quarter	Percent
1986-01-01	24.1369912790698
1986-04-01	24.7228280625227
1986-07-01	25.1033668044891
1986-10-01	24.6612588933702
1987-01-01	24.4565954177776
1987-04-01	24.8961719032142
1987-07-01	25.2536182875693
1987-10-01	24.6694846658872
1988-01-01	25.5117615370803
1988-04-01	26.1910107314445
1988-07-01	27.0045793301607
1988-10-01	26.3459900479670
1989-01-01	26.8443449048152
1989-04-01	27.8158755770696
1989-07-01	28.1304601048340
1989-10-01	27.1955686589833
1990-01-01	27.1541167564679
1990-04-01	26.9526561458102
1990-07-01	27.5288376220053
1990-10-01	26.4474498364713
1991-01-01	26.4905328049318
1991-04-01	26.9727592267135
1991-07-01	27.2791054593291
1991-10-01	26.8342807170966
1992-01-01	26.6710268149117
1992-04-01	27.3273273273273
1992-07-01	28.0394542452420
1992-10-01	26.8264147673109
1993-01-01	27.1749460043197
1993-04-01	27.3902922665747
1993-07-01	27.6680862046716
1993-10-01	26.4091902781945
1994-01-01	26.1903745142418
1994-04-01	26.6873908785079
1994-07-01	26.7527283536456
1994-10-01	25.4556988792557
1995-01-01	25.6801145456077
1995-04-01	25.8816120906801
1995-07-01	25.7531380753138
1995-10-01	24.6044303797468
1996-01-01	24.6042926990967
1996-04-01	24.7987117552335
1996-07-01	24.3960656817153
1996-10-01	24.5257508091941
1997-01-01	24.4705594319990
1997-04-01	24.8707615907518
1997-07-01	24.9116536008774
1997-10-01	24.3774043328609
1998-01-01	24.4678702693970
1998-04-01	25.2854088506999
1998-07-01	25.6094121439220
1998-10-01	24.9185864190086
1999-01-01	24.7792583079146
1999-04-01	25.5796229442439
1999-07-01	25.5819544052246
1999-10-01	24.4974623346521
2000-01-01	24.7846546498644
2000-04-01	25.8608321377331
2000-07-01	25.2756438323449
2000-10-01	24.0867217280813
2001-01-01	24.4888254873990
2001-04-01	24.9287298067786
2001-07-01	24.9407863571767
2001-10-01	23.4054245005299
2002-01-01	23.2026526233665
2002-04-01	24.2023134849779
2002-07-01	24.2547111523015
2002-10-01	23.5977902248139
2003-01-01	23.9590079622081
2003-04-01	24.8172140773573
2003-07-01	24.3676254382327
2003-10-01	23.5733033370829
2004-01-01	23.7958437488341
2004-04-01	24.5436633332094
2004-07-01	24.1329479768786
2004-10-01	22.3886654613880
2005-01-01	22.8425463099088
2005-04-01	23.6107038123167
2005-07-01	22.8035538005923
2005-10-01	21.9020907700153
2006-01-01	21.6127979105452
2006-04-01	22.3366952246683
2006-07-01	22.6351107583520
2006-10-01	22.1646703355994
2007-01-01	21.5469613259668
2007-04-01	22.2787713702018
2007-07-01	22.6032791580153
2007-10-01	21.5576346236252
2008-01-01	22.7743935021909
2008-04-01	22.3530667425644
2008-07-01	22.4097498578738
2008-10-01	21.2707867957310
2009-01-01	22.2878568144034
2009-04-01	22.5262117414481
2009-07-01	23.2662980312049
2009-10-01	22.1695629278568
2010-01-01	22.6652198263792
2010-04-01	23.0927907139361
2010-07-01	23.2397317686505
2010-10-01	22.6144838642225
2011-01-01	22.3053371372904
2011-04-01	23.0416028941144
2011-07-01	23.1930434782609
2011-10-01	22.2847808709554
2012-01-01	21.9797783259789
2012-04-01	22.9236919867895
2012-07-01	23.1381684166609
2012-10-01	23.5230785260306
2013-01-01	22.7975860155383
2013-04-01	23.0993138817659
2013-07-01	22.7010202317136
2013-10-01	21.4467879790460
2014-01-01	21.1198462013801
2014-04-01	22.1169306558106
2014-07-01	21.9277026336411
2014-10-01	20.2826352175681
2015-01-01	20.2915668342726
2015-04-01	21.3609507184101
2015-07-01	22.2667869915438
2015-10-01	21.3407746993555
2016-01-01	20.6759968312649
2016-04-01	20.5853466902377
2016-07-01	20.4836554443829
2016-10-01	18.8755670771225
2017-01-01	18.7411416054632
2017-04-01	20.1506893235011
2017-07-01	19.3053028126297
2017-10-01	18.3290978398984
2018-01-01	18.4064198154935
2018-04-01	19.0251423896284
2018-07-01	19.1161711203111