Quarter	US dollars
1999-03-31	13356
1999-06-30	14037
1999-09-30	19714
1999-12-31	3375
2000-03-31	14591
2000-06-30	25585
2000-09-30	23619
2000-12-31	36020
2001-03-31	20216
2001-06-30	19845
2001-09-30	9130
2001-12-31	8091
2002-03-31	23019
2002-06-30	11602
2002-09-30	12182
2002-12-31	11379
2003-03-31	16791
2003-06-30	18864
2003-09-30	20688
2003-12-31	23225
2004-03-31	37137
2004-06-30	34092
2004-09-30	32141
2004-12-31	34722
2005-03-31	30459
2005-06-30	36109
2005-09-30	33844
2005-12-31	35891
2006-03-31	43847
2006-06-30	43750
2006-09-30	36781
2006-12-31	31197
2007-03-31	29701
2007-06-30	17639
2007-09-30	19712
2007-12-31	12215
2008-03-31	15406
2008-06-30	13210
2008-09-30	14990
2008-12-31	16811
2009-03-31	7308
2009-06-30	8916
2009-09-30	10674
2009-12-31	8638
2010-03-31	9161
2010-06-30	6458
2010-09-30	6172
2010-12-31	6928
2011-03-31	5870
2011-06-30	7938
2011-09-30	9668
2011-12-31	8442
2012-03-31	6380
2012-06-30	9941
2012-09-30	10720
2012-12-31	9499
2013-03-31	12580
2013-06-30	9832
2013-09-30	7806
2013-12-31	5455
2014-03-31	5764
2014-06-30	5379
2014-09-30	4744
2014-12-31	8393
2015-03-31	7119
2015-06-30	7021
2015-09-30	6984
2015-12-31	6087
2016-03-31	6796
2016-06-30	5088
2016-09-30	5711
2016-12-31	5352
2017-03-31	6037
2017-06-30	5770
2017-09-30	7663
2017-12-31	6059
2018-03-31	5430
2018-06-30	5154
2018-09-30	5424
2018-12-31	4862
2019-03-31	5825
2019-06-30	5350
2019-09-30	4942
2019-12-31	5113
2020-03-31	6152
2020-06-30	6397
2020-09-30	6646
2020-12-31	6447
2021-03-31	5330
2021-06-30	3897
2021-09-30	4119
2021-12-31	4084
2022-03-31	3594
2022-06-30	3571
2022-09-30	3710
2022-12-31	4294
2023-03-31	4179
2023-06-30	3309
2023-09-30	1865