Quarter	US dollars
1992-03-31	30
1992-06-30	4
1992-09-30	4
1992-12-31	9
1993-03-31	5
1993-06-30	20
1993-09-30	18
1993-12-31	15
1994-03-31	86
1994-06-30	131
1994-09-30	76
1994-12-31	33
1995-03-31	26
1995-06-30	47
1995-09-30	49
1995-12-31	71
1996-03-31	75
1996-06-30	88
1996-09-30	73
1996-12-31	69
1997-03-31	78
1997-06-30	87
1997-09-30	78
1997-12-31	96
1998-03-31	82
1998-06-30	119
1998-09-30	108
1998-12-31	75
1999-03-31	136
1999-06-30	143
1999-09-30	151
1999-12-31	175
2000-03-31	234
2000-06-30	342
2000-09-30	271
2000-12-31	281
2001-03-31	243
2001-06-30	215
2001-09-30	193
2001-12-31	199
2002-03-31	279
2002-06-30	267
2002-09-30	456
2002-12-31	395
2003-03-31	525
2003-06-30	512
2003-09-30	436
2003-12-31	340
2004-03-31	441
2004-06-30	399
2004-09-30	595
2004-12-31	509
2005-03-31	681
2005-06-30	414
2005-09-30	418
2005-12-31	316
2006-03-31	443
2006-06-30	456
2006-09-30	324
2006-12-31	392
2007-03-31	635
2007-06-30	376
2007-09-30	442
2007-12-31	885
2008-03-31	800
2008-06-30	582
2008-09-30	443
2008-12-31	248
2009-03-31	295
2009-06-30	245
2009-09-30	598
2009-12-31	402
2010-03-31	468
2010-06-30	533
2010-09-30	520
2010-12-31	573
2011-03-31	806
2011-06-30	624
2011-09-30	862
2011-12-31	400
2012-03-31	748
2012-06-30	881
2012-09-30	399
2012-12-31	486
2013-03-31	332
2013-06-30	412
2013-09-30	469
2013-12-31	769
2014-03-31	658
2014-06-30	1132
2014-09-30	1056
2014-12-31	836
2015-03-31	412
2015-06-30	344
2015-09-30	492
2015-12-31	483
2016-03-31	373
2016-06-30	528
2016-09-30	1148
2016-12-31	502
2017-03-31	497
2017-06-30	592
2017-09-30	511
2017-12-31	356
2018-03-31	159
2018-06-30	561
2018-09-30	1192
2018-12-31	303
2019-03-31	1147
2019-06-30	439
2019-09-30	358
2019-12-31	345
2020-03-31	195
2020-06-30	198
2020-09-30	323
2020-12-31	197
2021-03-31	214
2021-06-30	274
2021-09-30	275
2021-12-31	269
2022-03-31	271
2022-06-30	291
2022-09-30	571
2022-12-31	392
2023-03-31	374
2023-06-30	280
2023-09-30	281