Quarter	US dollars
1987-03-31	3390
1987-06-30	1035
1987-09-30	1064
1987-12-31	3857
1988-03-31	2034
1988-06-30	-239
1988-09-30	479
1988-12-31	-331
1989-03-31	5348
1989-06-30	-41
1989-09-30	2162
1989-12-31	5171
1990-03-31	11148
1990-06-30	2485
1990-09-30	6478
1990-12-31	7815
1991-03-31	228
1991-06-30	-2719
1991-09-30	5806
1991-12-31	2072
1992-03-31	4092
1992-06-30	3725
1992-09-30	25557
1992-12-31	-337
1993-03-31	9944
1993-06-30	-1209
1993-09-30	8765
1993-12-31	5366
1994-03-31	9278
1994-06-30	6154
1994-09-30	4555
1994-12-31	26170
1995-03-31	24313
1995-06-30	28620
1995-09-30	15509
1995-12-31	-4408
1996-03-31	78
1996-06-30	10421
1996-09-30	1229
1996-12-31	-514
1997-03-31	10705
1997-06-30	12381
1997-09-30	302917
1997-12-31	16131
1998-03-31	29328
1998-06-30	18683
1998-09-30	-8635
1998-12-31	8273
1999-03-31	9620
1999-06-30	12824
1999-09-30	-24544
1999-12-31	3186
2000-03-31	41751
2000-06-30	-15768
2000-09-30	10122
2000-12-31	5710
2001-03-31	59157
2001-06-30	-15344
2001-09-30	-8249
2001-12-31	-17663
2002-03-31	4859
2002-06-30	-14652
2002-09-30	15529
2002-12-31	1982
2003-03-31	38093
2003-06-30	33463
2003-09-30	10537
2003-12-31	6698
2004-03-31	78745
2004-06-30	-32102
2004-09-30	-23270
2004-12-31	43726
2005-03-31	69344
2005-06-30	21829
2005-09-30	-25557
2005-12-31	26351
2006-03-31	86012
2006-06-30	6624
2006-09-30	-12506
2006-12-31	-17033
2007-03-31	94645
2007-06-30	20827
2007-09-30	27359
2007-12-31	-42090
2008-03-31	9875
2008-06-30	-37254
2008-09-30	12434
2008-12-31	-167941
2009-03-31	-46927
2009-06-30	-6057
2009-09-30	-49380
2009-12-31	9131
2010-03-31	2291
2010-06-30	13391
2010-09-30	6433
2010-12-31	-8475
2011-03-31	-8092
2011-06-30	-16787
2011-09-30	19372
2011-12-31	-64885
2012-03-31	-110
2012-06-30	-34193
2012-09-30	-4367
2012-12-31	-11913
2013-03-31	13571
2013-06-30	-30041
2013-09-30	-31608
2013-12-31	-9285
2014-03-31	36806
2014-06-30	7431
2014-09-30	-15910
2014-12-31	-15705
2015-03-31	35925
2015-06-30	-23233
2015-09-30	-25655
2015-12-31	11028
2016-03-31	2650
2016-06-30	30383
2016-09-30	-5058
2016-12-31	-38592
2017-03-31	-6078
2017-06-30	-840
2017-09-30	-1684
2017-12-31	3344
2018-03-31	-10297
2018-06-30	-53009
2018-09-30	11306
2018-12-31	-13963
2019-03-31	43742
2019-06-30	15488
2019-09-30	13631
2019-12-31	-41378
2020-03-31	68480
2020-06-30	-35996
2020-09-30	16997
2020-12-31	-52047
2021-03-31	-4804
2021-06-30	1408
2021-09-30	33758
2021-12-31	6538
2022-03-31	13859
2022-06-30	-38810
2022-09-30	4723
2022-12-31	-29165
2023-03-31	13970
2023-06-30	-19108
2023-09-30	11631