Quarter	US dollars
1999-03-31	5827
1999-06-30	7807
1999-09-30	7949
1999-12-31	8453
2000-03-31	12356
2000-06-30	10528
2000-09-30	10063
2000-12-31	8491
2001-03-31	9575
2001-06-30	10059
2001-09-30	11409
2001-12-31	9551
2002-03-31	14700
2002-06-30	12709
2002-09-30	15040
2002-12-31	9012
2003-03-31	16287
2003-06-30	16130
2003-09-30	17908
2003-12-31	16960
2004-03-31	19686
2004-06-30	25477
2004-09-30	25004
2004-12-31	19308
2005-03-31	24248
2005-06-30	23071
2005-09-30	26135
2005-12-31	19531
2006-03-31	21477
2006-06-30	19917
2006-09-30	16737
2006-12-31	19305
2007-03-31	19585
2007-06-30	21032
2007-09-30	25901
2007-12-31	20957
2008-03-31	21404
2008-06-30	19717
2008-09-30	24729
2008-12-31	17048
2009-03-31	20522
2009-06-30	19603
2009-09-30	16463
2009-12-31	17651
2010-03-31	17870
2010-06-30	17605
2010-09-30	15979
2010-12-31	15001
2011-03-31	17387
2011-06-30	14143
2011-09-30	23594
2011-12-31	15871
2012-03-31	20580
2012-06-30	19210
2012-09-30	21778
2012-12-31	21586
2013-03-31	19300
2013-06-30	22335
2013-09-30	21302
2013-12-31	18076
2014-03-31	130
2014-06-30	1
2014-09-30	383
2014-12-31	825
2015-03-31	870
2015-06-30	733
2015-09-30	793
2015-12-31	846
2016-03-31	772
2016-06-30	361
2016-09-30	347
2016-12-31	24
2017-03-31	32
2017-06-30	36
2017-09-30	39
2017-12-31	40
2018-03-31	749
2018-06-30	732
2018-09-30	1
2018-12-31	13
2019-03-31	6
2019-06-30	7
2019-09-30	185
2019-12-31	0
2020-03-31	4140
2020-06-30	3145
2020-09-30	12804
2020-12-31	6675
2021-03-31	7400
2021-06-30	7362
2021-09-30	8441
2021-12-31	7742
2022-03-31	7396
2022-06-30	7388
2022-09-30	7671
2022-12-31	6714
2023-03-31	6535
2023-06-30	7144
2023-09-30	5904