Quarter	US dollars
1999-03-31	147
1999-06-30	161
1999-09-30	224
1999-12-31	139
2000-03-31	148
2000-06-30	77
2000-09-30	58
2000-12-31	79
2001-03-31	40
2001-06-30	11
2001-09-30	30
2001-12-31	48
2002-03-31	39
2002-06-30	18
2002-09-30	30
2002-12-31	37
2003-03-31	26
2003-06-30	22
2003-09-30	18
2003-12-31	122
2004-03-31	125
2004-06-30	139
2004-09-30	91
2004-12-31	189
2005-03-31	172
2005-06-30	902
2005-09-30	182
2005-12-31	490
2006-03-31	573
2006-06-30	1010
2006-09-30	1449
2006-12-31	2332
2007-03-31	2198
2007-06-30	1740
2007-09-30	1611
2007-12-31	2342
2008-03-31	4030
2008-06-30	11980
2008-09-30	10055
2008-12-31	5238
2009-03-31	4950
2009-06-30	5007
2009-09-30	1158
2009-12-31	2407
2010-03-31	2410
2010-06-30	2447
2010-09-30	2949
2010-12-31	2259
2011-03-31	843
2011-06-30	786
2011-09-30	895
2011-12-31	984
2012-03-31	1614
2012-06-30	843
2012-09-30	3379
2012-12-31	3269
2013-03-31	4520
2013-06-30	4658
2013-09-30	4935
2013-12-31	5146
2014-03-31	4210
2014-06-30	4214
2014-09-30	4146
2014-12-31	3623
2015-03-31	3154
2015-06-30	3352
2015-09-30	4252
2015-12-31	5741
2016-03-31	4708
2016-06-30	4443
2016-09-30	3052
2016-12-31	2976
2017-03-31	3082
2017-06-30	3152
2017-09-30	511
2017-12-31	438
2018-03-31	453
2018-06-30	324
2018-09-30	364
2018-12-31	268
2019-03-31	215
2019-06-30	263
2019-09-30	213
2019-12-31	229
2020-03-31	194
2020-06-30	191
2020-09-30	220
2020-12-31	229
2021-03-31	213
2021-06-30	216
2021-09-30	199
2021-12-31	211
2022-03-31	199
2022-06-30	181
2022-09-30	194
2022-12-31	217
2023-03-31	206
2023-06-30	212
2023-09-30	203