Quarter	US dollars
2004-12-31	4254
2005-03-31	5970
2005-06-30	3415
2005-09-30	6918
2005-12-31	2501
2006-03-31	4609
2006-06-30	5500
2006-09-30	8442
2006-12-31	3861
2007-03-31	5129
2007-06-30	10750
2007-09-30	7280
2007-12-31	9080
2008-03-31	11094
2008-06-30	9061
2008-09-30	8330
2008-12-31	6650
2009-03-31	8073
2009-06-30	6497
2009-09-30	8724
2009-12-31	11090
2010-03-31	13220
2010-06-30	17954
2010-09-30	16938
2010-12-31	20452
2011-03-31	23721
2011-06-30	24359
2011-09-30	23228
2011-12-31	21563
2012-03-31	16305
2012-06-30	16141
2012-09-30	18169
2012-12-31	21469
2013-03-31	23506
2013-06-30	26758
2013-09-30	23978
2013-12-31	25417
2014-03-31	25516
2014-06-30	21228
2014-09-30	22322
2014-12-31	23026
2015-03-31	22817
2015-06-30	19473
2015-09-30	18687
2015-12-31	17463
2016-03-31	17346
2016-06-30	17490
2016-09-30	17426
2016-12-31	17457
2017-03-31	21487
2017-06-30	20781
2017-09-30	21405
2017-12-31	22029
2018-03-31	24889
2018-06-30	21970
2018-09-30	21160
2018-12-31	21402
2019-03-31	21356
2019-06-30	18531
2019-09-30	17221
2019-12-31	17719
2020-03-31	16444
2020-06-30	15735
2020-09-30	15529
2020-12-31	17741
2021-03-31	20126
2021-06-30	17556
2021-09-30	19747
2021-12-31	19753
2022-03-31	20155
2022-06-30	16612
2022-09-30	15294
2022-12-31	15055
2023-03-31	15447
2023-06-30	12167
2023-09-30	11601