Quarter	US dollars
1987-03-31	-81
1987-06-30	3406
1987-09-30	509
1987-12-31	4679
1988-03-31	-540
1988-06-30	2367
1988-09-30	1221
1988-12-31	5281
1989-03-31	1249
1989-06-30	4145
1989-09-30	-559
1989-12-31	5519
1990-03-31	766
1990-06-30	6929
1990-09-30	7517
1990-12-31	4349
1991-03-31	6096
1991-06-30	-7751
1991-09-30	392
1991-12-31	2914
1992-03-31	-649
1992-06-30	1688
1992-09-30	5260
1992-12-31	-2704
1993-03-31	-2685
1993-06-30	-2219
1993-09-30	-2886
1993-12-31	-1524
1994-03-31	-584
1994-06-30	882
1994-09-30	-1561
1994-12-31	-147
1995-03-31	-1882
1995-06-30	-2111
1995-09-30	1689
1995-12-31	1799
1996-03-31	1120
1996-06-30	2619
1996-09-30	1272
1996-12-31	1546
1997-03-31	-377
1997-06-30	1660
1997-09-30	70640
1997-12-31	9950
1998-03-31	-828
1998-06-30	905
1998-09-30	-3273
1998-12-31	2391
1999-03-31	-2131
1999-06-30	-1098
1999-09-30	-1187
1999-12-31	-569
2000-03-31	2129
2000-06-30	4389
2000-09-30	-3548
2000-12-31	2396
2001-03-31	8341
2001-06-30	820
2001-09-30	-5015
2001-12-31	298
2002-03-31	-8196
2002-06-30	-3800
2002-09-30	-6475
2002-12-31	1545
2003-03-31	-2373
2003-06-30	5389
2003-09-30	-1856
2003-12-31	5264
2004-03-31	-4788
2004-06-30	-5478
2004-09-30	-2673
2004-12-31	6350
2005-03-31	-11569
2005-06-30	1432
2005-09-30	3180
2005-12-31	6969
2006-03-31	437
2006-06-30	6266
2006-09-30	3660
2006-12-31	-3301
2007-03-31	9703
2007-06-30	-436
2007-09-30	6784
2007-12-31	2673
2008-03-31	-6802
2008-06-30	13952
2008-09-30	5953
2008-12-31	-20076
2009-03-31	7726
2009-06-30	10924
2009-09-30	-20098
2009-12-31	-7269
2010-03-31	-4587
2010-06-30	-1278
2010-09-30	1392
2010-12-31	1648
2011-03-31	-427
2011-06-30	-1519
2011-09-30	-33676
2011-12-31	-18309
2012-03-31	9633
2012-06-30	-8794
2012-09-30	-1482
2012-12-31	5504
2013-03-31	-3610
2013-06-30	-6492
2013-09-30	-2164
2013-12-31	-5714
2014-03-31	5198
2014-06-30	179
2014-09-30	-2484
2014-12-31	-5671
2015-03-31	-1737
2015-06-30	-1723
2015-09-30	-1484
2015-12-31	1464
2016-03-31	2020
2016-06-30	-94
2016-09-30	-1674
2016-12-31	6291
2017-03-31	-6553
2017-06-30	689
2017-09-30	916
2017-12-31	3504
2018-03-31	-4982
2018-06-30	-1820
2018-09-30	-1855
2018-12-31	-2204
2019-03-31	2803
2019-06-30	327
2019-09-30	1892
2019-12-31	1065
2020-03-31	-283
2020-06-30	1706
2020-09-30	-682
2020-12-31	901
2021-03-31	-6300
2021-06-30	-2354
2021-09-30	-541
2021-12-31	-190
2022-03-31	-4585
2022-06-30	-3583
2022-09-30	-4644
2022-12-31	-5635
2023-03-31	-407
2023-06-30	15
2023-09-30	10