Quarter	US dollars
1999-03-31	876
1999-06-30	1195
1999-09-30	1260
1999-12-31	1018
2000-03-31	943
2000-06-30	919
2000-09-30	1209
2000-12-31	1171
2001-03-31	647
2001-06-30	837
2001-09-30	675
2001-12-31	620
2002-03-31	1038
2002-06-30	1165
2002-09-30	1236
2002-12-31	1328
2003-03-31	802
2003-06-30	957
2003-09-30	843
2003-12-31	1005
2004-03-31	1158
2004-06-30	530
2004-09-30	637
2004-12-31	1583
2005-03-31	678
2005-06-30	522
2005-09-30	1078
2005-12-31	1725
2006-03-31	1167
2006-06-30	716
2006-09-30	1112
2006-12-31	1013
2007-03-31	1750
2007-06-30	2931
2007-09-30	3376
2007-12-31	1552
2008-03-31	1745
2008-06-30	1835
2008-09-30	3025
2008-12-31	2026
2009-03-31	4260
2009-06-30	2477
2009-09-30	2616
2009-12-31	1796
2010-03-31	3860
2010-06-30	3915
2010-09-30	3458
2010-12-31	3238
2011-03-31	5051
2011-06-30	4485
2011-09-30	3907
2011-12-31	3265
2012-03-31	1737
2012-06-30	2486
2012-09-30	1732
2012-12-31	1422
2013-03-31	1687
2013-06-30	782
2013-09-30	1437
2013-12-31	1778
2014-03-31	1530
2014-06-30	801
2014-09-30	1286
2014-12-31	735
2015-03-31	2129
2015-06-30	1297
2015-09-30	1252
2015-12-31	1264
2016-03-31	1001
2016-06-30	605
2016-09-30	630
2016-12-31	524
2017-03-31	901
2017-06-30	574
2017-09-30	573
2017-12-31	599
2018-03-31	461
2018-06-30	567
2018-09-30	513
2018-12-31	300
2019-03-31	982
2019-06-30	935
2019-09-30	646
2019-12-31	400
2020-03-31	491
2020-06-30	228
2020-09-30	216
2020-12-31	109
2021-03-31	65
2021-06-30	120
2021-09-30	153
2021-12-31	67
2022-03-31	91
2022-06-30	114
2022-09-30	165
2022-12-31	94
2023-03-31	234
2023-06-30	127
2023-09-30	228