Quarter	US dollars
1999-03-31	333
1999-06-30	417
1999-09-30	573
1999-12-31	352
2000-03-31	373
2000-06-30	353
2000-09-30	490
2000-12-31	499
2001-03-31	357
2001-06-30	349
2001-09-30	326
2001-12-31	237
2002-03-31	190
2002-06-30	257
2002-09-30	209
2002-12-31	303
2003-03-31	294
2003-06-30	313
2003-09-30	330
2003-12-31	378
2004-03-31	346
2004-06-30	391
2004-09-30	772
2004-12-31	829
2005-03-31	846
2005-06-30	879
2005-09-30	801
2005-12-31	625
2006-03-31	560
2006-06-30	757
2006-09-30	779
2006-12-31	942
2007-03-31	963
2007-06-30	1158
2007-09-30	1094
2007-12-31	1481
2008-03-31	1411
2008-06-30	1824
2008-09-30	1654
2008-12-31	1785
2009-03-31	1672
2009-06-30	1045
2009-09-30	1131
2009-12-31	632
2010-03-31	704
2010-06-30	629
2010-09-30	639
2010-12-31	613
2011-03-31	1107
2011-06-30	942
2011-09-30	912
2011-12-31	904
2012-03-31	1051
2012-06-30	863
2012-09-30	899
2012-12-31	796
2013-03-31	852
2013-06-30	693
2013-09-30	567
2013-12-31	620
2014-03-31	530
2014-06-30	629
2014-09-30	624
2014-12-31	709
2015-03-31	1435
2015-06-30	1212
2015-09-30	1263
2015-12-31	1506
2016-03-31	1086
2016-06-30	1205
2016-09-30	919
2016-12-31	942
2017-03-31	607
2017-06-30	680
2017-09-30	532
2017-12-31	393
2018-03-31	165
2018-06-30	271
2018-09-30	381
2018-12-31	262
2019-03-31	142
2019-06-30	244
2019-09-30	167
2019-12-31	145
2020-03-31	155
2020-06-30	117
2020-09-30	78
2020-12-31	16
2021-03-31	21
2021-06-30	99
2021-09-30	96
2021-12-31	99
2022-03-31	113
2022-06-30	99
2022-09-30	129
2022-12-31	92
2023-03-31	74
2023-06-30	125
2023-09-30	180