Quarter	Thousands
1986-12-31	322442
1987-03-31	299271
1987-06-30	387511
1987-09-30	395772
1987-12-31	349560
1988-03-31	390591
1988-06-30	489346
1988-09-30	413704
1988-12-31	300444
1989-03-31	254190
1989-06-30	314236
1989-09-30	310877
1989-12-31	281325
1990-03-31	283776
1990-06-30	267189
1990-09-30	259842
1990-12-31	251566
1991-03-31	219933
1991-06-30	281653
1991-09-30	254610
1991-12-31	220314
1992-03-31	217734
1992-06-30	249393
1992-09-30	221588
1992-12-31	168789
1993-03-31	225927
1993-06-30	273320
1993-09-30	252255
1993-12-31	221332
1994-03-31	225264
1994-06-30	269153
1994-09-30	247059
1994-12-31	220298
1995-03-31	201952
1995-06-30	224174
1995-09-30	220386
1995-12-31	212873
1996-03-31	207673
1996-06-30	269720
1996-09-30	277827
1996-12-31	264406
1997-03-31	233219
1997-06-30	318035
1997-09-30	291268
1997-12-31	206809
1998-03-31	204736
1998-06-30	261794
1998-09-30	245131
1998-12-31	197119
1999-03-31	223115
1999-06-30	312120
1999-09-30	289388
1999-12-31	237121
2000-03-31	240363
2000-06-30	305178
2000-09-30	266477
2000-12-31	243038
2001-03-31	257857
2001-06-30	349774
2001-09-30	323998
2001-12-31	262638
2002-03-31	305646
2002-06-30	388201
2002-09-30	331685
2002-12-31	286665
2003-03-31	233185
2003-06-30	305202
2003-09-30	327091
2003-12-31	294783
2004-03-31	286730
2004-06-30	336023
2004-09-30	245252
2004-12-31	188426
2005-03-31	196002
2005-06-30	275094
2005-09-30	267917
2005-12-31	247165
2006-03-31	254926
2006-06-30	321151
2006-09-30	298157
2006-12-31	263535
2007-03-31	248618
2007-06-30	302827
2007-09-30	257704
2007-12-31	182095
2008-03-31	150950
2008-06-30	141570
2008-09-30	99274
2008-12-31	78942
2009-03-31	98285
2009-06-30	155882
2009-09-30	167219
2009-12-31	151686
2010-03-31	121110
2010-06-30	157584
2010-09-30	139489
2010-12-31	112904
2011-03-31	110673
2011-06-30	142775
2011-09-30	148305
2011-12-31	130131
2012-03-31	129137
2012-06-30	152341
2012-09-30	144196
2012-12-31	141375
2013-03-31	128476
2013-06-30	183505
2013-09-30	189189
2013-12-31	189456
2014-03-31	175291
2014-06-30	198688
2014-09-30	192705
2014-12-31	158702
2015-03-31	152242
2015-06-30	209205
2015-09-30	214833
2015-12-31	188458
2016-03-31	180928
2016-06-30	217073
2016-09-30	191851
2016-12-31	182399
2017-03-31	182416
2017-06-30	209093
2017-09-30	200127
2017-12-31	171879
2018-03-31	164152
2018-06-30	206393
2018-09-30	195558
2018-12-31	175417
2019-03-31	167657
2019-06-30	206783
2019-09-30	200937
2019-12-31	177173
2020-03-31	173835
2020-06-30	70015
2020-09-30	242463
2020-12-31	268170
2021-03-31	225293
2021-06-30	252237
2021-09-30	212659
2021-12-31	181188
2022-03-31	187926
2022-06-30	201359
2022-09-30	202519
2022-12-31	127511
2023-03-31	123723
2023-06-30	160919
2023-09-30	135864
2023-12-31	127211