Quarter	US dollars
1987-03-31	-495
1987-06-30	6015
1987-09-30	2779
1987-12-31	478
1988-03-31	-4571
1988-06-30	1522
1988-09-30	-706
1988-12-31	5140
1989-03-31	5807
1989-06-30	2793
1989-09-30	-3615
1989-12-31	3660
1990-03-31	5787
1990-06-30	-1456
1990-09-30	3160
1990-12-31	2365
1991-03-31	1550
1991-06-30	1464
1991-09-30	1005
1991-12-31	-38602
1992-03-31	745
1992-06-30	-2281
1992-09-30	-2962
1992-12-31	8670
1993-03-31	-1532
1993-06-30	4384
1993-09-30	-4552
1993-12-31	8881
1994-03-31	6424
1994-06-30	4784
1994-09-30	7188
1994-12-31	8645
1995-03-31	2948
1995-06-30	-5483
1995-09-30	9237
1995-12-31	9286
1996-03-31	9031
1996-06-30	6518
1996-09-30	12217
1996-12-31	4000
1997-03-31	36004
1997-06-30	-6264
1997-09-30	183573
1997-12-31	18072
1998-03-31	12067
1998-06-30	-40
1998-09-30	-9156
1998-12-31	-21899
1999-03-31	12664
1999-06-30	4478
1999-09-30	10839
1999-12-31	-3719
2000-03-31	7823
2000-06-30	39201
2000-09-30	6097
2000-12-31	-11783
2001-03-31	-9186
2001-06-30	16417
2001-09-30	18520
2001-12-31	5670
2002-03-31	-14194
2002-06-30	-12539
2002-09-30	13110
2002-12-31	-12975
2003-03-31	-13440
2003-06-30	8561
2003-09-30	-6710
2003-12-31	10748
2004-03-31	17922
2004-06-30	17827
2004-09-30	-3613
2004-12-31	-8413
2005-03-31	3530
2005-06-30	46996
2005-09-30	-15978
2005-12-31	41712
2006-03-31	35192
2006-06-30	-16785
2006-09-30	28077
2006-12-31	45113
2007-03-31	52859
2007-06-30	21098
2007-09-30	-9292
2007-12-31	43860
2008-03-31	87652
2008-06-30	-86356
2008-09-30	-13722
2008-12-31	80175
2009-03-31	68840
2009-06-30	-126218
2009-09-30	-39205
2009-12-31	-18827
2010-03-31	8276
2010-06-30	21377
2010-09-30	172
2010-12-31	42415
2011-03-31	48345
2011-06-30	-5535
2011-09-30	102019
2011-12-31	-9257
2012-03-31	-65515
2012-06-30	-149043
2012-09-30	-6662
2012-12-31	7366
2013-03-31	13271
2013-06-30	-18560
2013-09-30	-20583
2013-12-31	2939
2014-03-31	13742
2014-06-30	23239
2014-09-30	43988
2014-12-31	31106
2015-03-31	2038
2015-06-30	944
2015-09-30	-7292
2015-12-31	-7685
2016-03-31	7585
2016-06-30	23188
2016-09-30	52306
2016-12-31	58187
2017-03-31	6115
2017-06-30	31836
2017-09-30	25277
2017-12-31	31676
2018-03-31	64647
2018-06-30	-7712
2018-09-30	-69624
2018-12-31	138305
2019-03-31	-18331
2019-06-30	-18534
2019-09-30	-7186
2019-12-31	-64996
2020-03-31	225754
2020-06-30	-86471
2020-09-30	13391
2020-12-31	59966
2021-03-31	87327
2021-06-30	-37903
2021-09-30	-2941
2021-12-31	-36339
2022-03-31	111396
2022-06-30	25378
2022-09-30	14860
2022-12-31	-134988
2023-03-31	-4832
2023-06-30	-107182
2023-09-30	53882