Quarter	Percent
1986-01-01	2.12244897959184
1986-04-01	2.43783520234032
1986-07-01	2.55950440169547
1986-10-01	2.49110320284698
1987-01-01	2.57069408740360
1987-04-01	2.59865255052936
1987-07-01	2.89924715681563
1987-10-01	2.73819055244195
1988-01-01	3.35097001763668
1988-04-01	3.92469687300574
1988-07-01	4.98477320083347
1988-10-01	4.65853272064649
1989-01-01	5.36934074662430
1989-04-01	5.87208379622282
1989-07-01	5.66608308133058
1989-10-01	5.37788385043755
1990-01-01	6.11731404308854
1990-04-01	6.65202384687794
1990-07-01	6.75675675675676
1990-10-01	7.41830571472820
1991-01-01	8.42072794571252
1991-04-01	8.76573533926926
1991-07-01	9.46256316031236
1991-10-01	9.50413223140496
1992-01-01	9.44941604732292
1992-04-01	8.97416528176462
1992-07-01	9.38540720557069
1992-10-01	8.92911010558069
1993-01-01	8.80371313070819
1993-04-01	8.45154546812006
1993-07-01	8.87627017334130
1993-10-01	8.32596522251695
1994-01-01	8.14039227252618
1994-04-01	7.34521028037383
1994-07-01	7.36439805967955
1994-10-01	6.33556655986018
1995-01-01	6.13807047949162
1995-04-01	5.09645839331990
1995-07-01	5.02158273381295
1995-10-01	4.88603988603989
1996-01-01	5.15682396157107
1996-04-01	4.74844544940644
1996-07-01	5.02250984805853
1996-10-01	5.04529616724739
1997-01-01	5.56478405315615
1997-04-01	5.25877618981546
1997-07-01	5.71861650819898
1997-10-01	5.38356164383563
1998-01-01	6.08052588331964
1998-04-01	6.39878904637402
1998-07-01	6.65283540802213
1998-10-01	6.22344071281700
1999-01-01	6.45647703906787
1999-04-01	6.16994904283157
1999-07-01	5.56403496600527
1999-10-01	5.03479328694228
2000-01-01	4.91937687892867
2000-04-01	4.65179915173074
2000-07-01	4.59455763708464
2000-10-01	4.07270739374060
2001-01-01	4.26870980982351
2001-04-01	4.21545667447307
2001-07-01	4.14543451315244
2001-10-01	4.24374319912949
2002-01-01	4.52825087861584
2002-04-01	3.63661127758104
2002-07-01	4.08190941144562
2002-10-01	3.58447179764642
2003-01-01	3.73594001071237
2003-04-01	3.36531963778889
2003-07-01	3.10140237324702
2003-10-01	2.87209770500604
2004-01-01	3.16405211379952
2004-04-01	2.48010610079576
2004-07-01	2.33143462710293
2004-10-01	2.22892356103317
2005-01-01	2.75026068821689
2005-04-01	2.68456375838926
2005-07-01	2.25201770372299
2005-10-01	2.29840780688238
2006-01-01	2.92903225806452
2006-04-01	2.26625226625227
2006-07-01	2.43933918430563
2006-10-01	2.22450816510222
2007-01-01	2.25167267112712
2007-04-01	2.42080865310327
2007-07-01	1.97037990985190
2007-10-01	2.17307445030217
2008-01-01	2.30510230510230
2008-04-01	2.53245918498522
2008-07-01	2.69081500646831
2008-10-01	2.92645360030805
2009-01-01	4.04721753794266
2009-04-01	4.09582689335394
2009-07-01	4.35121444343421
2009-10-01	4.49452672247263
2010-01-01	4.50346420323326
2010-04-01	4.51679320550766
2010-07-01	3.95465670488213
2010-10-01	4.16237113402062
2011-01-01	4.08084449021627
2011-04-01	3.96640826873385
2011-07-01	4.14078674948240
2011-10-01	4.29773462783172
2012-01-01	4.51496388028896
2012-04-01	4.52044025157233
2012-07-01	4.77572559366755
2012-10-01	4.13865823118492
2013-01-01	3.70273452832657
2013-04-01	4.06567630961689
2013-07-01	3.54960343258354
2013-10-01	3.13065976714101
2014-01-01	3.50134667179684
2014-04-01	2.98888746966407
2014-07-01	3.42360756259581
2014-10-01	3.16310975609756
2015-01-01	3.41095028319698
2015-04-01	3.33333333333333
2015-07-01	3.70276759762416
2015-10-01	2.98936835522201
2016-01-01	3.53130016051364
2016-04-01	3.26836944679821
2016-07-01	3.23628488931665
2016-10-01	3.38319088319088
2017-01-01	3.04214015151515
2017-04-01	3.16135856152309
2017-07-01	2.70238652316331
2017-10-01	2.56678281068525
2018-01-01	2.51550654720882
2018-04-01	2.70890725436180
2018-07-01	2.77241222588342