Quarter	US dollars
1986-12-31	2005
1987-03-31	-2588
1987-06-30	-933
1987-09-30	3196
1987-12-31	9605
1988-03-31	5985
1988-06-30	2136
1988-09-30	4786
1988-12-31	821
1989-03-31	19181
1989-06-30	13500
1989-09-30	-6172
1989-12-31	10847
1990-03-31	21615
1990-06-30	1869
1990-09-30	23896
1990-12-31	13458
1991-03-31	18634
1991-06-30	-10954
1991-09-30	123
1991-12-31	6037
1992-03-31	7795
1992-06-30	1243
1992-09-30	49055
1992-12-31	14697
1993-03-31	10268
1993-06-30	-4141
1993-09-30	1909
1993-12-31	19730
1994-03-31	6264
1994-06-30	-3891
1994-09-30	11173
1994-12-31	35906
1995-03-31	33300
1995-06-30	11081
1995-09-30	-2380
1995-12-31	491
1996-03-31	23448
1996-06-30	-5806
1996-09-30	20419
1996-12-31	4022
1997-03-31	43915
1997-06-30	519
1997-09-30	44950
1997-12-31	42547
1998-03-31	88877
1998-06-30	16637
1998-09-30	47314
1998-12-31	-37805
1999-03-31	31204
1999-06-30	-14448
1999-09-30	17863
1999-12-31	-8734
2000-03-31	101138
2000-06-30	-8875
2000-09-30	17308
2000-12-31	29367
2001-03-31	135952
2001-06-30	-20063
2001-09-30	16371
2001-12-31	-33993
2002-03-31	-7456
2002-06-30	-25335
2002-09-30	45635
2002-12-31	34885
2003-03-31	42021
2003-06-30	47379
2003-09-30	-28221
2003-12-31	37876
2004-03-31	182073
2004-06-30	2049
2004-09-30	8922
2004-12-31	-42721
2005-03-31	170074
2005-06-30	71063
2005-09-30	41970
2005-12-31	44924
2006-03-31	118998
2006-06-30	21172
2006-09-30	51350
2006-12-31	75483
2007-03-31	234137
2007-06-30	142604
2007-09-30	49206
2007-12-31	25046
2008-03-31	232128
2008-06-30	-129728
2008-09-30	-5969
2008-12-31	-129416
2009-03-31	-70289
2009-06-30	-9064
2009-09-30	-97746
2009-12-31	-71701
2010-03-31	54474
2010-06-30	62331
2010-09-30	14595
2010-12-31	-181233
2011-03-31	3275
2011-06-30	-20779
2011-09-30	88962
2011-12-31	-117604
2012-03-31	148324
2012-06-30	19362
2012-09-30	-104163
2012-12-31	-92796
2013-03-31	-93863
2013-06-30	-71217
2013-09-30	-198130
2013-12-31	-103697
2014-03-31	65316
2014-06-30	-28794
2014-09-30	-8635
2014-12-31	-1652
2015-03-31	136140
2015-06-30	-78310
2015-09-30	5621
2015-12-31	-27639
2016-03-31	29459
2016-06-30	69723
2016-09-30	10806
2016-12-31	-44621
2017-03-31	60033
2017-06-30	4442
2017-09-30	-46255
2017-12-31	9768
2018-03-31	30193
2018-06-30	25079
2018-09-30	24374
2018-12-31	-44177
2019-03-31	21199
2019-06-30	17148
2019-09-30	34855
2019-12-31	-182333
2020-03-31	181086
2020-06-30	-62287
2020-09-30	11540
2020-12-31	-10164
2021-03-31	83295
2021-06-30	-30376
2021-09-30	-70401
2021-12-31	-7085
2022-03-31	84935
2022-06-30	42977
2022-09-30	1890
2022-12-31	-103043
2023-03-31	3493
2023-06-30	-38625
2023-09-30	-22840