Quarter	US dollars
1987-03-31	-148
1987-06-30	2075
1987-09-30	3461
1987-12-31	1457
1988-03-31	-1873
1988-06-30	4195
1988-09-30	5279
1988-12-31	-10058
1989-03-31	9854
1989-06-30	482
1989-09-30	4005
1989-12-31	-6282
1990-03-31	221
1990-06-30	-8
1990-09-30	257
1990-12-31	-1926
1991-03-31	-909
1991-06-30	-5969
1991-09-30	3516
1991-12-31	859
1992-03-31	2731
1992-06-30	2882
1992-09-30	16019
1992-12-31	1963
1993-03-31	19972
1993-06-30	2930
1993-09-30	3539
1993-12-31	17327
1994-03-31	-9737
1994-06-30	4566
1994-09-30	8449
1994-12-31	-4572
1995-03-31	3809
1995-06-30	-1215
1995-09-30	185
1995-12-31	1286
1996-03-31	6606
1996-06-30	256
1996-09-30	10354
1996-12-31	-2049
1997-03-31	23141
1997-06-30	14366
1997-09-30	271121
1997-12-31	49064
1998-03-31	7780
1998-06-30	7256
1998-09-30	2315
1998-12-31	-32012
1999-03-31	75634
1999-06-30	54641
1999-09-30	-49114
1999-12-31	-25888
2000-03-31	42611
2000-06-30	17556
2000-09-30	9264
2000-12-31	606
2001-03-31	35581
2001-06-30	1023
2001-09-30	26930
2001-12-31	37502
2002-03-31	14147
2002-06-30	82
2002-09-30	35005
2002-12-31	13156
2003-03-31	37409
2003-06-30	19136
2003-09-30	21918
2003-12-31	-21522
2004-03-31	107736
2004-06-30	-18342
2004-09-30	103436
2004-12-31	-2566
2005-03-31	114650
2005-06-30	25186
2005-09-30	153553
2005-12-31	-48774
2006-03-31	125132
2006-06-30	-47033
2006-09-30	140003
2006-12-31	2764
2007-03-31	205356
2007-06-30	66171
2007-09-30	221057
2007-12-31	-46380
2008-03-31	178898
2008-06-30	-199805
2008-09-30	296874
2008-12-31	-320408
2009-03-31	-12970
2009-06-30	-42793
2009-09-30	12989
2009-12-31	15617
2010-03-31	164203
2010-06-30	21660
2010-09-30	69891
2010-12-31	-93041
2011-03-31	130595
2011-06-30	-45843
2011-09-30	60493
2011-12-31	-54966
2012-03-31	94366
2012-06-30	55521
2012-09-30	-47287
2012-12-31	-96695
2013-03-31	-55282
2013-06-30	-31403
2013-09-30	-183294
2013-12-31	-77939
2014-03-31	13396
2014-06-30	-42922
2014-09-30	9749
2014-12-31	-80920
2015-03-31	26091
2015-06-30	-61992
2015-09-30	-14959
2015-12-31	-22731
2016-03-31	12010
2016-06-30	56059
2016-09-30	-73654
2016-12-31	-69080
2017-03-31	53565
2017-06-30	-26701
2017-09-30	6053
2017-12-31	60791
2018-03-31	44708
2018-06-30	-60909
2018-09-30	32447
2018-12-31	3533
2019-03-31	28433
2019-06-30	5646
2019-09-30	9563
2019-12-31	-25079
2020-03-31	240497
2020-06-30	-153988
2020-09-30	-20049
2020-12-31	79536
2021-03-31	28850
2021-06-30	-10120
2021-09-30	-31078
2021-12-31	67801
2022-03-31	90098
2022-06-30	48065
2022-09-30	57168
2022-12-31	-72431
2023-03-31	98685
2023-06-30	55126
2023-09-30	29026