Quarter	Percent
1986-01-01	70.3926022063595
1986-04-01	67.6576282260699
1986-07-01	66.9626706133860
1986-10-01	68.9643799472296
1987-01-01	69.0960171872418
1987-04-01	67.0707406177350
1987-07-01	66.1661661661662
1987-10-01	67.4414715719064
1988-01-01	65.0386035582410
1988-04-01	61.9763513513514
1988-07-01	60.1936799184506
1988-10-01	61.5830774479700
1989-01-01	59.7634150522887
1989-04-01	57.2488781498102
1989-07-01	56.1762664816100
1989-10-01	60.0625651720542
1990-01-01	59.4119693806541
1990-04-01	59.1305865921788
1990-07-01	57.2929434424794
1990-10-01	58.4866001050972
1991-01-01	56.2697022767075
1991-04-01	54.0175438596491
1991-07-01	52.3030942334740
1991-10-01	54.8301953193736
1992-01-01	53.4248987497799
1992-04-01	52.5767737380868
1992-07-01	51.4963697538516
1992-10-01	54.3663471778488
1993-01-01	53.0750088873089
1993-04-01	51.5956498484578
1993-07-01	52.8727402899588
1993-10-01	54.9973084514624
1994-01-01	55.1761322789360
1994-04-01	53.7200504413619
1994-07-01	56.2962962962963
1994-10-01	58.0481622306717
1995-01-01	58.3393763596809
1995-04-01	57.8823102070469
1995-07-01	58.1831421809576
1995-10-01	61.0391978122151
1996-01-01	59.0875912408759
1996-04-01	58.4277879341865
1996-07-01	58.6832935998533
1996-10-01	58.9479492367114
1997-01-01	58.6836283185841
1997-04-01	57.0477247502775
1997-07-01	56.0074280408542
1997-10-01	58.8191469547402
1998-01-01	56.8385650224215
1998-04-01	55.0740949165260
1998-07-01	54.4546995667734
1998-10-01	54.3823196071024
1999-01-01	54.1390414851298
1999-04-01	51.7490494296578
1999-07-01	53.4006477424271
1999-10-01	56.7562416619020
2000-01-01	54.9094375595806
2000-04-01	52.3764077113953
2000-07-01	52.9770992366412
2000-10-01	56.5416111216911
2001-01-01	54.9306479194376
2001-04-01	54.8863636363636
2001-07-01	54.3777066465826
2001-10-01	57.1642069867364
2002-01-01	58.2269109753840
2002-04-01	55.5555555555556
2002-07-01	54.0432491368345
2002-10-01	56.8136813681368
2003-01-01	56.0341758632965
2003-04-01	54.3259911894273
2003-07-01	55.7422969187675
2003-10-01	57.3741946717743
2004-01-01	57.2096243725117
2004-04-01	53.7135964156471
2004-07-01	54.2597045688767
2004-10-01	59.5278823126924
2005-01-01	56.0211207630727
2005-04-01	54.9991512476659
2005-07-01	55.3450608930988
2005-10-01	58.6799124431722
2006-01-01	59.3498659517426
2006-04-01	56.9736403069736
2006-07-01	56.2604062604063
2006-10-01	59.4679966749792
2007-01-01	58.3430184293542
2007-04-01	56.7796610169492
2007-07-01	56.7270913021786
2007-10-01	60.1496259351621
2008-01-01	55.6940980881130
2008-04-01	55.5610972568579
2008-07-01	54.5605582322645
2008-10-01	57.4676402256887
2009-01-01	53.4968511766656
2009-04-01	50.8681991069952
2009-07-01	49.0930079155673
2009-10-01	50.8789222934122
2010-01-01	50.2046161401211
2010-04-01	48.0078380143697
2010-07-01	48.5909757289461
2010-10-01	50.7957128937967
2011-01-01	50.1296176279974
2011-04-01	48.3327937843962
2011-07-01	48.2050452781371
2011-10-01	50.0887812752220
2012-01-01	49.9193288157470
2012-04-01	49.0316333118141
2012-07-01	48.1284285253308
2012-10-01	47.3658772353794
2013-01-01	49.1394563294193
2013-04-01	47.8400513891119
2013-07-01	47.9186679474864
2013-10-01	51.9049896381317
2014-01-01	51.5622521808089
2014-04-01	50.2051767676768
2014-07-01	49.9921568627451
2014-10-01	55.0864620657423
2015-01-01	54.5665994727865
2015-04-01	52.4161280393967
2015-07-01	50.9815950920245
2015-10-01	54.3209876543210
2016-01-01	54.7507198060312
2016-04-01	53.0127723516153
2016-07-01	52.7736131934033
2016-10-01	56.6238038277512
2017-01-01	56.6487775790101
2017-04-01	52.8605482717521
2017-07-01	54.0649195949970
2017-10-01	57.9699360023813
2018-01-01	57.8266686487290
2018-04-01	55.5043141922047
2018-07-01	56.3170441001192