Quarter	US dollars
1999-03-31	7
1999-06-30	46
1999-09-30	34
1999-12-31	26
2000-03-31	21
2000-06-30	27
2000-09-30	27
2000-12-31	22
2001-03-31	21
2001-06-30	9
2001-09-30	13
2001-12-31	8
2002-03-31	5
2002-06-30	3
2002-09-30	13
2002-12-31	13
2003-03-31	17
2003-06-30	37
2003-09-30	42
2003-12-31	86
2004-03-31	79
2004-06-30	60
2004-09-30	47
2004-12-31	43
2005-03-31	48
2005-06-30	43
2005-09-30	19
2005-12-31	14
2006-03-31	12
2006-06-30	11
2006-09-30	26
2006-12-31	23
2007-03-31	25
2007-06-30	27
2007-09-30	40
2007-12-31	55
2008-03-31	34
2008-06-30	40
2008-09-30	237
2008-12-31	16
2009-03-31	62
2009-06-30	98
2009-09-30	137
2009-12-31	172
2010-03-31	211
2010-06-30	206
2010-09-30	215
2010-12-31	256
2011-03-31	251
2011-06-30	253
2011-09-30	296
2011-12-31	325
2012-03-31	317
2012-06-30	366
2012-09-30	406
2012-12-31	377
2013-03-31	263
2013-06-30	260
2013-09-30	249
2013-12-31	287
2014-03-31	265
2014-06-30	262
2014-09-30	320
2014-12-31	271
2015-03-31	388
2015-06-30	354
2015-09-30	304
2015-12-31	303
2016-03-31	297
2016-06-30	292
2016-09-30	283
2016-12-31	277
2017-03-31	271
2017-06-30	265
2017-09-30	252
2017-12-31	242
2018-03-31	253
2018-06-30	288
2018-09-30	276
2018-12-31	178
2019-03-31	208
2019-06-30	382
2019-09-30	353
2019-12-31	503
2020-03-31	743
2020-06-30	743
2020-09-30	765
2020-12-31	831
2021-03-31	793
2021-06-30	1021
2021-09-30	1029
2021-12-31	809
2022-03-31	892
2022-06-30	1065
2022-09-30	1143
2022-12-31	1104
2023-03-31	1203
2023-06-30	1192
2023-09-30	1324