Quarter	US dollars
2004-12-31	30321
2005-03-31	33023
2005-06-30	38533
2005-09-30	39534
2005-12-31	27558
2006-03-31	42261
2006-06-30	35392
2006-09-30	37648
2006-12-31	38700
2007-03-31	41076
2007-06-30	37022
2007-09-30	45177
2007-12-31	35737
2008-03-31	35169
2008-06-30	38711
2008-09-30	34874
2008-12-31	25572
2009-03-31	21201
2009-06-30	23798
2009-09-30	21986
2009-12-31	17814
2010-03-31	14606
2010-06-30	17676
2010-09-30	17160
2010-12-31	14194
2011-03-31	20544
2011-06-30	7636
2011-09-30	8138
2011-12-31	10054
2012-03-31	11415
2012-06-30	10048
2012-09-30	7311
2012-12-31	7413
2013-03-31	5666
2013-06-30	5330
2013-09-30	5326
2013-12-31	5649
2014-03-31	5067
2014-06-30	5757
2014-09-30	4658
2014-12-31	6053
2015-03-31	4597
2015-06-30	4094
2015-09-30	3301
2015-12-31	4944
2016-03-31	3556
2016-06-30	3227
2016-09-30	2319
2016-12-31	2299
2017-03-31	3025
2017-06-30	2750
2017-09-30	2836
2017-12-31	3365
2018-03-31	2993
2018-06-30	3740
2018-09-30	2921
2018-12-31	1296
2019-03-31	2666
2019-06-30	2761
2019-09-30	4449
2019-12-31	2303
2020-03-31	4336
2020-06-30	2400
2020-09-30	2052
2020-12-31	2005
2021-03-31	2813
2021-06-30	1919
2021-09-30	1990
2021-12-31	1784
2022-03-31	1590
2022-06-30	2339
2022-09-30	3377
2022-12-31	2927
2023-03-31	2655
2023-06-30	3965
2023-09-30	3638