Quarter	US dollars
1999-03-31	177
1999-06-30	151
1999-09-30	292
1999-12-31	34
2000-03-31	31
2000-06-30	49
2000-09-30	68
2000-12-31	93
2001-03-31	123
2001-06-30	87
2001-09-30	85
2001-12-31	196
2002-03-31	172
2002-06-30	561
2002-09-30	1310
2002-12-31	1553
2003-03-31	1810
2003-06-30	2335
2003-09-30	2767
2003-12-31	2046
2004-03-31	2878
2004-06-30	4103
2004-09-30	4846
2004-12-31	3974
2005-03-31	5969
2005-06-30	7419
2005-09-30	7680
2005-12-31	9476
2006-03-31	7459
2006-06-30	8593
2006-09-30	10717
2006-12-31	11564
2007-03-31	11431
2007-06-30	13222
2007-09-30	14934
2007-12-31	14902
2008-03-31	14425
2008-06-30	14658
2008-09-30	13655
2008-12-31	9942
2009-03-31	6591
2009-06-30	7948
2009-09-30	6881
2009-12-31	7592
2010-03-31	7408
2010-06-30	9645
2010-09-30	11349
2010-12-31	11769
2011-03-31	13699
2011-06-30	12204
2011-09-30	9449
2011-12-31	7774
2012-03-31	8137
2012-06-30	7387
2012-09-30	5060
2012-12-31	2891
2013-03-31	3286
2013-06-30	2266
2013-09-30	1830
2013-12-31	2614
2014-03-31	771
2014-06-30	1548
2014-09-30	2173
2014-12-31	187
2015-03-31	1522
2015-06-30	1120
2015-09-30	3257
2015-12-31	3229
2016-03-31	1207
2016-06-30	309
2016-09-30	262
2016-12-31	693
2017-03-31	478
2017-06-30	393
2017-09-30	320
2017-12-31	420
2018-03-31	568
2018-06-30	988
2018-09-30	1262
2018-12-31	1962
2019-03-31	2098
2019-06-30	1086
2019-09-30	1518
2019-12-31	1513
2020-03-31	501
2020-06-30	496
2020-09-30	728
2020-12-31	573
2021-03-31	595
2021-06-30	717
2021-09-30	870
2021-12-31	904
2022-03-31	1600
2022-06-30	653
2022-09-30	1773
2022-12-31	326
2023-03-31	465
2023-06-30	331
2023-09-30	485