Quarter	US dollars
1986-09-30	32485
1986-12-31	32655
1987-03-31	32082
1987-06-30	31845
1987-09-30	33109
1987-12-31	39357
1988-03-31	36928
1988-06-30	34073
1988-09-30	34122
1988-12-31	31458
1989-03-31	31151
1989-06-30	30132
1989-09-30	29258
1989-12-31	28239
1990-03-31	31568
1990-06-30	28268
1990-09-30	29014
1990-12-31	33020
1991-03-31	30058
1991-06-30	27453
1991-09-30	29919
1991-12-31	27682
1992-03-31	28328
1992-06-30	28331
1992-09-30	32022
1992-12-31	29533
1993-03-31	29904
1993-06-30	27725
1993-09-30	29976
1993-12-31	27752
1994-03-31	29239
1994-06-30	30070
1994-09-30	33730
1994-12-31	32366
1995-03-31	35452
1995-06-30	33113
1995-09-30	29450
1995-12-31	34944
1996-03-31	41960
1996-06-30	37665
1996-09-30	39491
1996-12-31	37973
1997-03-31	40636
1997-06-30	42800
1997-09-30	39672
1997-12-31	42571
1998-03-31	43096
1998-06-30	40915
1998-09-30	50478
1998-12-31	42585
1999-03-31	44819
1999-06-30	38818
1999-09-30	49829
1999-12-31	45831
2000-03-31	53992
2000-06-30	42115
2000-09-30	36712
2000-12-31	38642
2001-03-31	48341
2001-06-30	47255
2001-09-30	55751
2001-12-31	49407
2002-03-31	50959
2002-06-30	58950
2002-09-30	56917
2002-12-31	48727
2003-03-31	55833
2003-06-30	54568
2003-09-30	57377
2003-12-31	58588
2004-03-31	84897
2004-06-30	71141
2004-09-30	66402
2004-12-31	71187
2005-03-31	90752
2005-06-30	84057
2005-09-30	82093
2005-12-31	71997
2006-03-31	74671
2006-06-30	77870
2006-09-30	84780
2006-12-31	96463
2007-03-31	114758
2007-06-30	135101
2007-09-30	139524
2007-12-31	149424
2008-03-31	140041
2008-06-30	134607
2008-09-30	110380
2008-12-31	103732
2009-03-31	105867
2009-06-30	100598
2009-09-30	104594
2009-12-31	92287
2010-03-31	78226
2010-06-30	76679
2010-09-30	85852
2010-12-31	75419
2011-03-31	83187
2011-06-30	70627
2011-09-30	59211
2011-12-31	60859
2012-03-31	60229
2012-06-30	55080
2012-09-30	54635
2012-12-31	54620
2013-03-31	58501
2013-06-30	49476
2013-09-30	49760
2013-12-31	45850
2014-03-31	45192
2014-06-30	60059
2014-09-30	44169
2014-12-31	39010
2015-03-31	45859
2015-06-30	46054
2015-09-30	43917
2015-12-31	43376
2016-03-31	42638
2016-06-30	39619
2016-09-30	39205
2016-12-31	40271
2017-03-31	40991
2017-06-30	43337
2017-09-30	44231
2017-12-31	52426
2018-03-31	55354
2018-06-30	54657
2018-09-30	46398
2018-12-31	35673
2019-03-31	34826
2019-06-30	27723
2019-09-30	39940
2019-12-31	32187
2020-03-31	40085
2020-06-30	32618
2020-09-30	35837
2020-12-31	31220
2021-03-31	37295
2021-06-30	35169
2021-09-30	32352
2021-12-31	27670
2022-03-31	36399
2022-06-30	36427
2022-09-30	30383
2022-12-31	36500
2023-03-31	29199
2023-06-30	37210
2023-09-30	38203