Quarter	US dollars
1986-12-31	10613
1987-03-31	3988
1987-06-30	6903
1987-09-30	-441
1987-12-31	9231
1988-03-31	-857
1988-06-30	5692
1988-09-30	11335
1988-12-31	-5341
1989-03-31	12933
1989-06-30	11945
1989-09-30	7179
1989-12-31	9988
1990-03-31	20047
1990-06-30	-1175
1990-09-30	11050
1990-12-31	34860
1991-03-31	-1901
1991-06-30	-18997
1991-09-30	2381
1991-12-31	16332
1992-03-31	-8619
1992-06-30	-7585
1992-09-30	46104
1992-12-31	53822
1993-03-31	19677
1993-06-30	8006
1993-09-30	21589
1993-12-31	29524
1994-03-31	-12062
1994-06-30	-6584
1994-09-30	11530
1994-12-31	35329
1995-03-31	27707
1995-06-30	15763
1995-09-30	-6802
1995-12-31	-17878
1996-03-31	4153
1996-06-30	-7185
1996-09-30	8745
1996-12-31	7568
1997-03-31	20991
1997-06-30	-2898
1997-09-30	17918
1997-12-31	34150
1998-03-31	50751
1998-06-30	-12645
1998-09-30	32890
1998-12-31	-78098
1999-03-31	-26160
1999-06-30	-18034
1999-09-30	10341
1999-12-31	-17483
2000-03-31	40224
2000-06-30	9456
2000-09-30	-1674
2000-12-31	1178
2001-03-31	87916
2001-06-30	-9215
2001-09-30	29459
2001-12-31	-22206
2002-03-31	20332
2002-06-30	20753
2002-09-30	33827
2002-12-31	62728
2003-03-31	66986
2003-06-30	62738
2003-09-30	-50914
2003-12-31	21150
2004-03-31	127721
2004-06-30	-18212
2004-09-30	66187
2004-12-31	28483
2005-03-31	130708
2005-06-30	37328
2005-09-30	52826
2005-12-31	-29922
2006-03-31	123933
2006-06-30	29352
2006-09-30	37787
2006-12-31	56888
2007-03-31	218446
2007-06-30	76332
2007-09-30	-7375
2007-12-31	102894
2008-03-31	76526
2008-06-30	-113616
2008-09-30	-35118
2008-12-31	-5991
2009-03-31	-68422
2009-06-30	-137238
2009-09-30	-75005
2009-12-31	18057
2010-03-31	-2840
2010-06-30	-15809
2010-09-30	25015
2010-12-31	-85013
2011-03-31	84826
2011-06-30	2597
2011-09-30	68914
2011-12-31	-57510
2012-03-31	75899
2012-06-30	30793
2012-09-30	-24391
2012-12-31	-4688
2013-03-31	-64060
2013-06-30	-85156
2013-09-30	-109353
2013-12-31	11502
2014-03-31	16036
2014-06-30	20618
2014-09-30	-22011
2014-12-31	-24867
2015-03-31	98074
2015-06-30	-76785
2015-09-30	-33720
2015-12-31	-48793
2016-03-31	24176
2016-06-30	3433
2016-09-30	-37718
2016-12-31	-56344
2017-03-31	31139
2017-06-30	23433
2017-09-30	-42455
2017-12-31	-50124
2018-03-31	60799
2018-06-30	30520
2018-09-30	17475
2018-12-31	-13446
2019-03-31	37052
2019-06-30	35874
2019-09-30	39355
2019-12-31	-116288
2020-03-31	153403
2020-06-30	-25133
2020-09-30	45070
2020-12-31	-29672
2021-03-31	-4040
2021-06-30	-6404
2021-09-30	-27120
2021-12-31	9712
2022-03-31	20219
2022-06-30	-57857
2022-09-30	1678
2022-12-31	-61896
2023-03-31	-40914
2023-06-30	803
2023-09-30	9529