Quarter	US dollars
1999-03-31	48
1999-06-30	55
1999-09-30	95
1999-12-31	106
2000-03-31	83
2000-06-30	96
2000-09-30	207
2000-12-31	143
2001-03-31	306
2001-06-30	393
2001-09-30	392
2001-12-31	332
2002-03-31	302
2002-06-30	634
2002-09-30	286
2002-12-31	54
2003-03-31	26
2003-06-30	39
2003-09-30	45
2003-12-31	48
2004-03-31	41
2004-06-30	53
2004-09-30	50
2004-12-31	387
2005-03-31	434
2005-06-30	634
2005-09-30	1130
2005-12-31	1107
2006-03-31	1268
2006-06-30	1642
2006-09-30	1814
2006-12-31	2446
2007-03-31	3053
2007-06-30	3314
2007-09-30	3524
2007-12-31	4568
2008-03-31	5712
2008-06-30	7874
2008-09-30	8839
2008-12-31	7229
2009-03-31	4888
2009-06-30	4517
2009-09-30	4748
2009-12-31	2510
2010-03-31	2450
2010-06-30	1938
2010-09-30	2840
2010-12-31	4068
2011-03-31	3795
2011-06-30	3379
2011-09-30	4096
2011-12-31	5934
2012-03-31	6045
2012-06-30	7101
2012-09-30	7269
2012-12-31	7594
2013-03-31	7915
2013-06-30	6299
2013-09-30	5435
2013-12-31	4800
2014-03-31	4750
2014-06-30	4318
2014-09-30	3870
2014-12-31	4152
2015-03-31	3791
2015-06-30	3041
2015-09-30	3207
2015-12-31	2890
2016-03-31	3222
2016-06-30	3329
2016-09-30	2692
2016-12-31	2504
2017-03-31	2554
2017-06-30	1570
2017-09-30	2457
2017-12-31	1762
2018-03-31	1902
2018-06-30	1762
2018-09-30	993
2018-12-31	771
2019-03-31	762
2019-06-30	856
2019-09-30	845
2019-12-31	1041
2020-03-31	1062
2020-06-30	1361
2020-09-30	1492
2020-12-31	1475
2021-03-31	1811
2021-06-30	1464
2021-09-30	2519
2021-12-31	1722
2022-03-31	2451
2022-06-30	2886
2022-09-30	2451
2022-12-31	1470
2023-03-31	1131
2023-06-30	1244
2023-09-30	1136