Quarter	US dollars
1987-03-31	1193
1987-06-30	1288
1987-09-30	1941
1987-12-31	211
1988-03-31	385
1988-06-30	837
1988-09-30	1108
1988-12-31	-1719
1989-03-31	163
1989-06-30	-214
1989-09-30	288
1989-12-31	-1336
1990-03-31	5392
1990-06-30	-2330
1990-09-30	5324
1990-12-31	-3770
1991-03-31	5195
1991-06-30	-3083
1991-09-30	404
1991-12-31	-31
1992-03-31	3483
1992-06-30	-2551
1992-09-30	10985
1992-12-31	1100
1993-03-31	3666
1993-06-30	-6588
1993-09-30	6947
1993-12-31	-4565
1994-03-31	1820
1994-06-30	-3253
1994-09-30	2410
1994-12-31	-1237
1995-03-31	5558
1995-06-30	-3620
1995-09-30	-4305
1995-12-31	15674
1996-03-31	10226
1996-06-30	-5163
1996-09-30	6210
1996-12-31	9387
1997-03-31	11288
1997-06-30	-11150
1997-09-30	84223
1997-12-31	8061
1998-03-31	1769
1998-06-30	2844
1998-09-30	15258
1998-12-31	808
1999-03-31	14624
1999-06-30	-18890
1999-09-30	9346
1999-12-31	-25120
2000-03-31	18742
2000-06-30	-2633
2000-09-30	-2394
2000-12-31	-3602
2001-03-31	45684
2001-06-30	-1049
2001-09-30	-11531
2001-12-31	10116
2002-03-31	8528
2002-06-30	-10219
2002-09-30	-8752
2002-12-31	14496
2003-03-31	6022
2003-06-30	27580
2003-09-30	8319
2003-12-31	-22605
2004-03-31	32437
2004-06-30	14618
2004-09-30	-6127
2004-12-31	-152
2005-03-31	47581
2005-06-30	37962
2005-09-30	-52120
2005-12-31	4529
2006-03-31	-16266
2006-06-30	4293
2006-09-30	12497
2006-12-31	26518
2007-03-31	3840
2007-06-30	54973
2007-09-30	-2761
2007-12-31	-2409
2008-03-31	-1926
2008-06-30	-3858
2008-09-30	-30092
2008-12-31	1660
2009-03-31	5617
2009-06-30	-10647
2009-09-30	-30371
2009-12-31	17800
2010-03-31	26917
2010-06-30	-8717
2010-09-30	20692
2010-12-31	-3563
2011-03-31	-20047
2011-06-30	-10728
2011-09-30	-34713
2011-12-31	-25766
2012-03-31	-13159
2012-06-30	-476
2012-09-30	-2321
2012-12-31	810
2013-03-31	-3465
2013-06-30	230
2013-09-30	-1598
2013-12-31	-3251
2014-03-31	6118
2014-06-30	4942
2014-09-30	-6599
2014-12-31	12462
2015-03-31	17767
2015-06-30	2577
2015-09-30	16749
2015-12-31	-6141
2016-03-31	-11053
2016-06-30	-11580
2016-09-30	7936
2016-12-31	4069
2017-03-31	1848
2017-06-30	1874
2017-09-30	-12409
2017-12-31	-13550
2018-03-31	-14388
2018-06-30	27932
2018-09-30	3493
2018-12-31	-14123
2019-03-31	4954
2019-06-30	2630
2019-09-30	-1529
2019-12-31	4950
2020-03-31	10976
2020-06-30	-15340
2020-09-30	-15368
2020-12-31	-7204
2021-03-31	-10239
2021-06-30	-2231
2021-09-30	2624
2021-12-31	9418
2022-03-31	-8051
2022-06-30	-151
2022-09-30	-7057
2022-12-31	1969
2023-03-31	-1064
2023-06-30	-5406
2023-09-30	-248