Quarter	US dollars
1986-12-31	13612
1987-03-31	14301
1987-06-30	22851
1987-09-30	29373
1987-12-31	20169
1988-03-31	-4318
1988-06-30	17198
1988-09-30	27802
1988-12-31	-5441
1989-03-31	26628
1989-06-30	-1006
1989-09-30	17646
1989-12-31	15838
1990-03-31	20370
1990-06-30	2734
1990-09-30	52149
1990-12-31	14289
1991-03-31	-4316
1991-06-30	-27380
1991-09-30	-1302
1991-12-31	-10246
1992-03-31	-10182
1992-06-30	4830
1992-09-30	72833
1992-12-31	3528
1993-03-31	-3207
1993-06-30	-380
1993-09-30	9495
1993-12-31	55195
1994-03-31	-871
1994-06-30	17377
1994-09-30	39768
1994-12-31	41336
1995-03-31	39282
1995-06-30	10791
1995-09-30	26143
1995-12-31	2288
1996-03-31	25782
1996-06-30	16284
1996-09-30	48465
1996-12-31	43334
1997-03-31	111361
1997-06-30	16814
1997-09-30	46193
1997-12-31	126449
1998-03-31	20858
1998-06-30	63667
1998-09-30	92222
1998-12-31	-81490
1999-03-31	71920
1999-06-30	39345
1999-09-30	-42905
1999-12-31	-33795
2000-03-31	173930
2000-06-30	54029
2000-09-30	57916
2000-12-31	52894
2001-03-31	201552
2001-06-30	-56801
2001-09-30	21794
2001-12-31	20202
2002-03-31	-2430
2002-06-30	-14063
2002-09-30	66772
2002-12-31	76247
2003-03-31	92651
2003-06-30	130963
2003-09-30	-20071
2003-12-31	51103
2004-03-31	359757
2004-06-30	5106
2004-09-30	64337
2004-12-31	34675
2005-03-31	275636
2005-06-30	223662
2005-09-30	57190
2005-12-31	76689
2006-03-31	367609
2006-06-30	66913
2006-09-30	196520
2006-12-31	78185
2007-03-31	596957
2007-06-30	236142
2007-09-30	272741
2007-12-31	199529
2008-03-31	294201
2008-06-30	-554055
2008-09-30	148411
2008-12-31	-588172
2009-03-31	-45221
2009-06-30	-166527
2009-09-30	-138614
2009-12-31	-76278
2010-03-31	153081
2010-06-30	30058
2010-09-30	127486
2010-12-31	-156179
2011-03-31	96318
2011-06-30	-18422
2011-09-30	90074
2011-12-31	-131498
2012-03-31	97087
2012-06-30	-132827
2012-09-30	-76542
2012-12-31	-127630
2013-03-31	-53526
2013-06-30	-143604
2013-09-30	-248869
2013-12-31	-92649
2014-03-31	94856
2014-06-30	30449
2014-09-30	50747
2014-12-31	-38151
2015-03-31	59280
2015-06-30	-138400
2015-09-30	-884
2015-12-31	-28984
2016-03-31	-38435
2016-06-30	161952
2016-09-30	-323
2016-12-31	-61355
2017-03-31	22244
2017-06-30	7889
2017-09-30	55193
2017-12-31	128348
2018-03-31	133700
2018-06-30	-126714
2018-09-30	-63630
2018-12-31	192851
2019-03-31	8341
2019-06-30	5192
2019-09-30	29630
2019-12-31	-114004
2020-03-31	604510
2020-06-30	-351840
2020-09-30	-14671
2020-12-31	121152
2021-03-31	113917
2021-06-30	-33701
2021-09-30	29615
2021-12-31	125060
2022-03-31	236586
2022-06-30	94344
2022-09-30	98669
2022-12-31	-283700
2023-03-31	78099
2023-06-30	-87119
2023-09-30	112148