Quarter	US dollars
1999-09-30	2799
1999-12-31	8949
2000-03-31	4028
2000-06-30	8358
2000-09-30	9181
2000-12-31	9553
2001-03-31	7567
2001-06-30	8287
2001-09-30	7744
2001-12-31	5813
2002-03-31	4369
2002-06-30	6564
2002-09-30	7700
2002-12-31	4906
2003-03-31	5921
2003-06-30	4333
2003-09-30	6047
2003-12-31	5834
2004-03-31	5700
2004-06-30	4753
2004-09-30	3665
2004-12-31	4051
2005-03-31	3497
2005-06-30	3683
2005-09-30	3820
2005-12-31	5139
2006-03-31	4938
2006-06-30	3953
2006-09-30	4932
2006-12-31	4417
2007-03-31	4383
2007-06-30	3036
2007-09-30	4825
2007-12-31	4483
2008-03-31	7913
2008-06-30	9040
2008-09-30	7134
2008-12-31	2742
2009-03-31	956
2009-06-30	1542
2009-09-30	1755
2009-12-31	2673
2010-03-31	6628
2010-06-30	3486
2010-09-30	5025
2010-12-31	2867
2011-03-31	4077
2011-06-30	5309
2011-09-30	7853
2011-12-31	6459
2012-03-31	6541
2012-06-30	8014
2012-09-30	5432
2012-12-31	4412
2013-03-31	5949
2013-06-30	4813
2013-09-30	4604
2013-12-31	5602
2014-03-31	10032
2014-06-30	3207
2014-09-30	6097
2014-12-31	4047
2015-03-31	8883
2015-06-30	4105
2015-09-30	7034
2015-12-31	7443
2016-03-31	4268
2016-06-30	8560
2016-09-30	10991
2016-12-31	8430
2017-03-31	10431
2017-06-30	9990
2017-09-30	11907
2017-12-31	18637
2018-03-31	21703
2018-06-30	18351
2018-09-30	17585
2018-12-31	34652
2019-03-31	25085
2019-06-30	16701
2019-09-30	12417
2019-12-31	30350
2020-03-31	12373
2020-06-30	10184
2020-09-30	11893
2020-12-31	22732
2021-03-31	17733
2021-06-30	17540
2021-09-30	17554
2021-12-31	25201
2022-03-31	18622
2022-06-30	19688
2022-09-30	15930
2022-12-31	20379
2023-03-31	17521
2023-06-30	16392
2023-09-30	17204
2023-12-31	16241