Quarter	US dollars
1987-03-31	8639
1987-06-30	6041
1987-09-30	16326
1987-12-31	2527
1988-03-31	3225
1988-06-30	2208
1988-09-30	19666
1988-12-31	-5783
1989-03-31	1414
1989-06-30	-12872
1989-09-30	13283
1989-12-31	794
1990-03-31	-13073
1990-06-30	-8612
1990-09-30	11890
1990-12-31	4728
1991-03-31	-28926
1991-06-30	-4720
1991-09-30	-15118
1991-12-31	-7856
1992-03-31	-26410
1992-06-30	-11959
1992-09-30	-13074
1992-12-31	7106
1993-03-31	-20556
1993-06-30	-3995
1993-09-30	2599
1993-12-31	22698
1994-03-31	-10177
1994-06-30	1534
1994-09-30	6336
1994-12-31	13504
1995-03-31	-13057
1995-06-30	-6055
1995-09-30	-1514
1995-12-31	-8704
1996-03-31	-18861
1996-06-30	-4194
1996-09-30	-5276
1996-12-31	3764
1997-03-31	10186
1997-06-30	4720
1997-09-30	204906
1997-12-31	-3541
1998-03-31	-25337
1998-06-30	-12850
1998-09-30	-3580
1998-12-31	-9726
1999-03-31	-15703
1999-06-30	-10845
1999-09-30	3257
1999-12-31	958
2000-03-31	6347
2000-06-30	15962
2000-09-30	-29
2000-12-31	16700
2001-03-31	5869
2001-06-30	-1284
2001-09-30	549
2001-12-31	-13194
2002-03-31	-15163
2002-06-30	-1008
2002-09-30	10194
2002-12-31	22454
2003-03-31	-30657
2003-06-30	-2853
2003-09-30	-9572
2003-12-31	-5676
2004-03-31	10040
2004-06-30	-6045
2004-09-30	12964
2004-12-31	-4023
2005-03-31	-28282
2005-06-30	33549
2005-09-30	-661
2005-12-31	1356
2006-03-31	-14047
2006-06-30	7692
2006-09-30	240
2006-12-31	-7896
2007-03-31	6935
2007-06-30	17927
2007-09-30	1270
2007-12-31	18854
2008-03-31	-7536
2008-06-30	6544
2008-09-30	-6012
2008-12-31	4917
2009-03-31	-20006
2009-06-30	41935
2009-09-30	-6158
2009-12-31	-10264
2010-03-31	-12740
2010-06-30	-3634
2010-09-30	16
2010-12-31	-4218
2011-03-31	11445
2011-06-30	4767
2011-09-30	5385
2011-12-31	18075
2012-03-31	8320
2012-06-30	14850
2012-09-30	16128
2012-12-31	11606
2013-03-31	16682
2013-06-30	-19708
2013-09-30	7646
2013-12-31	1292
2014-03-31	-18212
2014-06-30	11915
2014-09-30	-14474
2014-12-31	26651
2015-03-31	-11063
2015-06-30	5330
2015-09-30	10021
2015-12-31	26805
2016-03-31	-22597
2016-06-30	25495
2016-09-30	4005
2016-12-31	75
2017-03-31	1235
2017-06-30	-12416
2017-09-30	15146
2017-12-31	9712
2018-03-31	4054
2018-06-30	-10268
2018-09-30	8396
2018-12-31	16089
2019-03-31	-3495
2019-06-30	3047
2019-09-30	1440
2019-12-31	6808
2020-03-31	8226
2020-06-30	-18373
2020-09-30	-1008
2020-12-31	13957
2021-03-31	-8278
2021-06-30	8038
2021-09-30	-15504
2021-12-31	14180
2022-03-31	5054
2022-06-30	4090
2022-09-30	14879
2022-12-31	3966
2023-03-31	-35457
2023-06-30	-9997
2023-09-30	16197