Quarter	US dollars
1999-03-31	2239
1999-06-30	1775
1999-09-30	1900
1999-12-31	1589
2000-03-31	1986
2000-06-30	2492
2000-09-30	2374
2000-12-31	1659
2001-03-31	2488
2001-06-30	3110
2001-09-30	3142
2001-12-31	2707
2002-03-31	3864
2002-06-30	3740
2002-09-30	3882
2002-12-31	3983
2003-03-31	6272
2003-06-30	4776
2003-09-30	4704
2003-12-31	6939
2004-03-31	8432
2004-06-30	5439
2004-09-30	6612
2004-12-31	10345
2005-03-31	6126
2005-06-30	9733
2005-09-30	8655
2005-12-31	6692
2006-03-31	11508
2006-06-30	8486
2006-09-30	8566
2006-12-31	7721
2007-03-31	10896
2007-06-30	6750
2007-09-30	7102
2007-12-31	9726
2008-03-31	8275
2008-06-30	8145
2008-09-30	6733
2008-12-31	6888
2009-03-31	6548
2009-06-30	7381
2009-09-30	8377
2009-12-31	7100
2010-03-31	7618
2010-06-30	6588
2010-09-30	9168
2010-12-31	7647
2011-03-31	8864
2011-06-30	8351
2011-09-30	9633
2011-12-31	8323
2012-03-31	6531
2012-06-30	6828
2012-09-30	8845
2012-12-31	7866
2013-03-31	9092
2013-06-30	9101
2013-09-30	9820
2013-12-31	8998
2014-03-31	7613
2014-06-30	10997
2014-09-30	11092
2014-12-31	9634
2015-03-31	8257
2015-06-30	8241
2015-09-30	9387
2015-12-31	9469
2016-03-31	8785
2016-06-30	8470
2016-09-30	9254
2016-12-31	9356
2017-03-31	9482
2017-06-30	8998
2017-09-30	10058
2017-12-31	11564
2018-03-31	8965
2018-06-30	9687
2018-09-30	9376
2018-12-31	9466
2019-03-31	10529
2019-06-30	11212
2019-09-30	9126
2019-12-31	9885
2020-03-31	11198
2020-06-30	8826
2020-09-30	8632
2020-12-31	6360
2021-03-31	5954
2021-06-30	4823
2021-09-30	4236
2021-12-31	5414
2022-03-31	4488
2022-06-30	4582
2022-09-30	4486
2022-12-31	5319
2023-03-31	3372
2023-06-30	3195
2023-09-30	3197