Quarter	US dollars
1986-12-31	2734
1987-03-31	2038
1987-06-30	134
1987-09-30	4397
1987-12-31	1257
1988-03-31	4629
1988-06-30	8201
1988-09-30	1486
1988-12-31	-6451
1989-03-31	-1725
1989-06-30	4891
1989-09-30	-240
1989-12-31	2046
1990-03-31	1852
1990-06-30	3211
1990-09-30	2188
1990-12-31	1039
1991-03-31	1349
1991-06-30	-6413
1991-09-30	-2646
1991-12-31	-2552
1992-03-31	1087
1992-06-30	6281
1992-09-30	23134
1992-12-31	-5899
1993-03-31	947
1993-06-30	-1618
1993-09-30	2892
1993-12-31	13015
1994-03-31	-10893
1994-06-30	-199
1994-09-30	5303
1994-12-31	7111
1995-03-31	-6772
1995-06-30	13956
1995-09-30	-4879
1995-12-31	4628
1996-03-31	-835
1996-06-30	1206
1996-09-30	7842
1996-12-31	8835
1997-03-31	20544
1997-06-30	8902
1997-09-30	2563
1997-12-31	24025
1998-03-31	8936
1998-06-30	-9264
1998-09-30	8968
1998-12-31	2233
1999-03-31	3592
1999-06-30	-8033
1999-09-30	-705
1999-12-31	-9506
2000-03-31	30412
2000-06-30	4613
2000-09-30	15749
2000-12-31	-7198
2001-03-31	23138
2001-06-30	-20548
2001-09-30	21351
2001-12-31	150
2002-03-31	5733
2002-06-30	-10641
2002-09-30	-9118
2002-12-31	9522
2003-03-31	3370
2003-06-30	17534
2003-09-30	-3515
2003-12-31	14340
2004-03-31	60652
2004-06-30	649
2004-09-30	-56462
2004-12-31	6863
2005-03-31	53930
2005-06-30	4884
2005-09-30	12729
2005-12-31	45167
2006-03-31	35668
2006-06-30	50970
2006-09-30	-14460
2006-12-31	66475
2007-03-31	178433
2007-06-30	252
2007-09-30	15233
2007-12-31	88240
2008-03-31	18586
2008-06-30	-91570
2008-09-30	21524
2008-12-31	6744
2009-03-31	15763
2009-06-30	-64244
2009-09-30	-102054
2009-12-31	-10641
2010-03-31	17202
2010-06-30	-17695
2010-09-30	20880
2010-12-31	-15736
2011-03-31	-28255
2011-06-30	-7952
2011-09-30	6443
2011-12-31	-42813
2012-03-31	22287
2012-06-30	-1566
2012-09-30	-1093
2012-12-31	-33596
2013-03-31	-25143
2013-06-30	13418
2013-09-30	-18559
2013-12-31	11674
2014-03-31	21000
2014-06-30	-4928
2014-09-30	6093
2014-12-31	494
2015-03-31	16487
2015-06-30	10507
2015-09-30	18116
2015-12-31	-15362
2016-03-31	3554
2016-06-30	22632
2016-09-30	29704
2016-12-31	6319
2017-03-31	10370
2017-06-30	11354
2017-09-30	-16176
2017-12-31	-14677
2018-03-31	9000
2018-06-30	-6723
2018-09-30	10336
2018-12-31	22775
2019-03-31	27690
2019-06-30	-9135
2019-09-30	-1578
2019-12-31	-4759
2020-03-31	45726
2020-06-30	-30119
2020-09-30	9504
2020-12-31	-8556
2021-03-31	-5193
2021-06-30	-8888
2021-09-30	33505
2021-12-31	22624
2022-03-31	-13152
2022-06-30	-8081
2022-09-30	18018
2022-12-31	-35863
2023-03-31	20626
2023-06-30	-9720
2023-09-30	-8589