Quarter	Percent
1986-01-01	11.2179487179487
1986-04-01	12.1528732471817
1986-07-01	12.9115084823475
1986-10-01	12.7001555494556
1987-01-01	12.1817684095264
1987-04-01	13.2464217339776
1987-07-01	13.4401748315425
1987-10-01	13.3436279407757
1988-01-01	14.1043083900227
1988-04-01	15.1605879150789
1988-07-01	16.2961618727883
1988-10-01	15.2556200145033
1989-01-01	15.3769481696267
1989-04-01	16.5412170127868
1989-07-01	17.2241863838274
1989-10-01	16.4994123496971
1990-01-01	16.5465032444124
1990-04-01	16.8061178587494
1990-07-01	17.5525228945951
1990-10-01	16.2372517444981
1991-01-01	16.5418894830660
1991-04-01	17.2579354494532
1991-07-01	17.4831380901668
1991-10-01	16.7433628318584
1992-01-01	16.5681517423908
1992-04-01	17.6512016902896
1992-07-01	18.3951485322552
1992-10-01	17.4614305750351
1993-01-01	17.2070261295115
1993-04-01	17.5270317404953
1993-07-01	18.2838743364372
1993-10-01	16.6175195143105
1994-01-01	16.8135476067047
1994-04-01	17.0500560006892
1994-07-01	17.3539518900344
1994-10-01	16.3443436590792
1995-01-01	16.1482743928419
1995-04-01	16.8506879565144
1995-07-01	16.8669600541638
1995-10-01	15.5128852956038
1996-01-01	15.6875890388000
1996-04-01	16.6249164996660
1996-07-01	16.3489552984267
1996-10-01	15.6014258476333
1997-01-01	15.8807498554794
1997-04-01	16.3425086533707
1997-07-01	16.5130821128846
1997-10-01	15.3947152470048
1998-01-01	15.6239764166394
1998-04-01	16.7907699860895
1998-07-01	17.4681059862610
1998-10-01	16.7061321139871
1999-01-01	16.4423782725716
1999-04-01	17.6820813962972
1999-07-01	17.6882947505706
1999-10-01	16.2355620627949
2000-01-01	16.5015429592334
2000-04-01	17.7750710515631
2000-07-01	17.3373357131267
2000-10-01	15.9501254959113
2001-01-01	16.3337915420070
2001-04-01	17.4664727742769
2001-07-01	17.2774869109948
2001-10-01	15.8737786320679
2002-01-01	15.0270614453996
2002-04-01	16.7564143173899
2002-07-01	16.6968717989126
2002-10-01	16.0729664135285
2003-01-01	16.2689467547610
2003-04-01	17.6470588235294
2003-07-01	17.5963683927060
2003-10-01	16.6743224621038
2004-01-01	16.6247619047619
2004-04-01	16.7299513973269
2004-07-01	16.8484022414054
2004-10-01	15.1165422041186
2005-01-01	15.2499060503570
2005-04-01	16.4754405699288
2005-07-01	16.0892015266033
2005-10-01	14.7427293064877
2006-01-01	14.4194339202140
2006-04-01	15.4045451180694
2006-07-01	15.6222287910139
2006-10-01	14.6310901452053
2007-01-01	14.5441176470588
2007-04-01	15.6514071570284
2007-07-01	15.4393950517583
2007-10-01	14.7450922941694
2008-01-01	15.8029383816972
2008-04-01	15.6772544724352
2008-07-01	16.2836506894288
2008-10-01	14.9213515875328
2009-01-01	15.9619296716071
2009-04-01	16.0539482271046
2009-07-01	17.3227206946454
2009-10-01	15.9500793536286
2010-01-01	16.5815408963384
2010-04-01	16.8104067845336
2010-07-01	16.9706980752657
2010-10-01	16.4695764351752
2011-01-01	16.2206639954207
2011-04-01	17.1949910554562
2011-07-01	17.2416261093616
2011-10-01	16.2660944206009
2012-01-01	15.8346445429838
2012-04-01	17.5148521938301
2012-07-01	17.8875760830648
2012-10-01	17.8755364806867
2013-01-01	17.6142857142857
2013-04-01	17.7381377095969
2013-07-01	17.4854050975367
2013-10-01	16.1962842150050
2014-01-01	15.7950455219140
2014-04-01	16.4581869290232
2014-07-01	16.9720279720280
2014-10-01	15.4412786657401
2015-01-01	14.8872908311437
2015-04-01	16.1800068704912
2015-07-01	17.1452009844135
2015-10-01	16.0771267567384
2016-01-01	15.4779560469192
2016-04-01	15.5318439479827
2016-07-01	15.2564868272613
2016-10-01	13.9011677772646
2017-01-01	13.6703383162864
2017-04-01	14.9305329071815
2017-07-01	14.7244043368175
2017-10-01	13.7118129561454
2018-01-01	13.7317840405726
2018-04-01	14.3733623058733
2018-07-01	14.7159959246052