Quarter	Percent
1986-01-01	32.1138211382114
1986-04-01	32.6792963464141
1986-07-01	32.2733423545332
1986-10-01	35.3419092755586
1987-01-01	34.5294515910630
1987-04-01	35.8835477318890
1987-07-01	35.2742044685173
1987-10-01	37.3053486797563
1988-01-01	36.3821138211382
1988-04-01	39.6879240162822
1988-07-01	41.7687074829932
1988-10-01	41.6893732970027
1989-01-01	43.2081911262799
1989-04-01	43.3060109289618
1989-07-01	44.1176470588235
1989-10-01	43.3561643835616
1990-01-01	42.7004797806717
1990-04-01	43.4752747252747
1990-07-01	43.5650378527185
1990-10-01	43.8016528925620
1991-01-01	43.7543133195307
1991-04-01	43.5773480662983
1991-07-01	43.4602076124568
1991-10-01	43.6590436590437
1992-01-01	43.1345353675451
1992-04-01	43.6111111111111
1992-07-01	44.0194714881780
1992-10-01	43.6717663421419
1993-01-01	42.7380125086866
1993-04-01	40.0139178844816
1993-07-01	40.0556328233658
1993-10-01	39.5138888888889
1994-01-01	38.8773388773389
1994-04-01	37.6731301939058
1994-07-01	37.4394463667820
1994-10-01	36.0441075120606
1995-01-01	35.5769230769231
1995-04-01	35.9589041095890
1995-07-01	34.4005449591281
1995-10-01	33.9201083276913
1996-01-01	31.1994609164420
1996-04-01	31.7449664429530
1996-07-01	31.5543695797198
1996-10-01	30.9271523178808
1997-01-01	31.4717477003942
1997-04-01	29.5039164490862
1997-07-01	31.4081765087605
1997-10-01	31.2258064516129
1998-01-01	30.2504816955684
1998-04-01	29.2573623559539
1998-07-01	29.5613477431659
1998-10-01	29.7604035308953
1999-01-01	27.7847309136421
1999-04-01	29.4592914853947
1999-07-01	28.2716049382716
1999-10-01	29.4730392156863
2000-01-01	29.2757151552039
2000-04-01	29.1490645745323
2000-07-01	27.9904306220096
2000-10-01	26.1255924170616
2001-01-01	26.1303581914269
2001-04-01	26.5579499126383
2001-07-01	26.3400576368876
2001-10-01	25.8375922771153
2002-01-01	22.9994404029099
2002-04-01	22.6091763405196
2002-07-01	23.1021299836155
2002-10-01	23.1391585760518
2003-01-01	24.7735748534896
2003-04-01	24.0252897787144
2003-07-01	24.0750390828557
2003-10-01	23.1839258114374
2004-01-01	24.1080530071356
2004-04-01	22.1605249873801
2004-07-01	21.6000000000000
2004-10-01	20.1189296333003
2005-01-01	20.6777996070727
2005-04-01	20.5653021442495
2005-07-01	20.4556471158507
2005-10-01	20.1251805488686
2006-01-01	19.1682600382409
2006-04-01	18.1558935361217
2006-07-01	18.8090737240076
2006-10-01	19.5682778038480
2007-01-01	17.2574626865672
2007-04-01	17.9879462216041
2007-07-01	19.2449355432781
2007-10-01	18.0200729927007
2008-01-01	18.2557614098509
2008-04-01	18.3572710951526
2008-07-01	18.8140882746322
2008-10-01	17.8476527900797
2009-01-01	17.1428571428571
2009-04-01	17.1179039301310
2009-07-01	17.6419592544430
2009-10-01	17.9001721170396
2010-01-01	18.4457728437233
2010-04-01	17.1549893842887
2010-07-01	16.3851351351351
2010-10-01	18.0025178346622
2011-01-01	17.8750000000000
2011-04-01	18.0613090306545
2011-07-01	17.2712283594394
2011-10-01	16.5092402464066
2012-01-01	16.3047931175748
2012-04-01	17.0073589533933
2012-07-01	17.7261613691932
2012-10-01	17.6207876573285
2013-01-01	18.2517199514367
2013-04-01	17.1912832929782
2013-07-01	17.6305220883534
2013-10-01	17.8186176588094
2014-01-01	16.3751987281399
2014-04-01	16.1328588374852
2014-07-01	17.3947264856356
2014-10-01	16.7906066536204
2015-01-01	15.7259634098871
2015-04-01	16.8021680216802
2015-07-01	17.3846153846154
2015-10-01	17.2268907563025
2016-01-01	16.9703872437358
2016-04-01	15.5614167294650
2016-07-01	15.2320359281437
2016-10-01	15.0130063173541
2017-01-01	13.1413805832410
2017-04-01	14.0710883107365
2017-07-01	13.0054644808743
2017-10-01	12.3416576185306
2018-01-01	13.2686084142395
2018-04-01	12.2631390775831
2018-07-01	13.0419331911869