Quarter	US dollars
1999-03-31	1308
1999-06-30	1120
1999-09-30	1458
1999-12-31	1296
2000-03-31	1581
2000-06-30	1530
2000-09-30	2058
2000-12-31	2750
2001-03-31	4068
2001-06-30	3680
2001-09-30	4730
2001-12-31	4126
2002-03-31	4115
2002-06-30	4325
2002-09-30	4209
2002-12-31	4558
2003-03-31	4854
2003-06-30	5541
2003-09-30	5797
2003-12-31	4692
2004-03-31	2556
2004-06-30	2934
2004-09-30	2959
2004-12-31	3351
2005-03-31	2692
2005-06-30	3090
2005-09-30	3112
2005-12-31	4176
2006-03-31	3700
2006-06-30	4820
2006-09-30	4662
2006-12-31	4672
2007-03-31	6040
2007-06-30	7045
2007-09-30	6919
2007-12-31	7331
2008-03-31	12243
2008-06-30	10222
2008-09-30	8329
2008-12-31	7368
2009-03-31	7886
2009-06-30	7487
2009-09-30	8619
2009-12-31	12647
2010-03-31	10886
2010-06-30	6973
2010-09-30	8782
2010-12-31	8874
2011-03-31	12364
2011-06-30	12661
2011-09-30	10300
2011-12-31	8887
2012-03-31	8668
2012-06-30	8618
2012-09-30	13415
2012-12-31	12735
2013-03-31	13451
2013-06-30	12145
2013-09-30	11443
2013-12-31	14566
2014-03-31	15814
2014-06-30	19897
2014-09-30	17838
2014-12-31	19018
2015-03-31	20998
2015-06-30	21348
2015-09-30	20654
2015-12-31	16868
2016-03-31	16810
2016-06-30	18089
2016-09-30	18809
2016-12-31	19374
2017-03-31	17964
2017-06-30	17989
2017-09-30	19661
2017-12-31	22437
2018-03-31	24555
2018-06-30	22557
2018-09-30	22698
2018-12-31	25387
2019-03-31	27322
2019-06-30	26108
2019-09-30	22222
2019-12-31	26641
2020-03-31	31693
2020-06-30	31010
2020-09-30	28660
2020-12-31	31248
2021-03-31	32241
2021-06-30	33174
2021-09-30	35472
2021-12-31	33294
2022-03-31	38380
2022-06-30	34203
2022-09-30	35389
2022-12-31	32006
2023-03-31	32647
2023-06-30	31518
2023-09-30	27214