Quarter	US dollars
1999-09-30	2141
1999-12-31	3942
2000-03-31	2979
2000-06-30	2630
2000-09-30	2774
2000-12-31	4798
2001-03-31	3958
2001-06-30	4142
2001-09-30	4206
2001-12-31	4137
2002-03-31	4408
2002-06-30	2295
2002-09-30	1787
2002-12-31	528
2003-03-31	0
2003-06-30	0
2003-09-30	447
2003-12-31	280
2004-03-31	0
2004-06-30	1237
2004-09-30	2131
2004-12-31	1966
2005-03-31	4576
2005-06-30	5491
2005-09-30	4552
2005-12-31	4683
2006-03-31	5627
2006-06-30	4352
2006-09-30	7442
2006-12-31	9270
2007-03-31	9029
2007-06-30	12298
2007-09-30	6009
2007-12-31	7218
2008-03-31	3022
2008-06-30	3125
2008-09-30	1850
2008-12-31	4429
2009-03-31	2302
2009-06-30	3060
2009-09-30	1528
2009-12-31	1147
2010-03-31	200
2010-06-30	1698
2010-09-30	400
2010-12-31	943
2011-03-31	783
2011-06-30	947
2011-09-30	1101
2011-12-31	939
2012-03-31	948
2012-06-30	0
2012-09-30	1585
2012-12-31	1632
2013-03-31	3510
2013-06-30	3962
2013-09-30	3769
2013-12-31	3414
2014-03-31	2069
2014-06-30	2873
2014-09-30	2406
2014-12-31	3120
2015-03-31	5454
2015-06-30	4452
2015-09-30	3441
2015-12-31	2976
2016-03-31	4670
2016-06-30	2544
2016-09-30	3293
2016-12-31	4119
2017-03-31	6838
2017-06-30	6953
2017-09-30	7488
2017-12-31	6112
2018-03-31	6485
2018-06-30	9999
2018-09-30	5865
2018-12-31	4672
2019-03-31	4145
2019-06-30	3525
2019-09-30	3922
2019-12-31	1824
2020-03-31	9986
2020-06-30	11836
2020-09-30	6642
2020-12-31	4984
2021-03-31	6381
2021-06-30	3295
2021-09-30	3976
2021-12-31	4093
2022-03-31	13317
2022-06-30	8975
2022-09-30	5843
2022-12-31	8465
2023-03-31	7785
2023-06-30	4955
2023-09-30	4840
2023-12-31	7872