Quarter	US dollars
2004-12-31	3488
2005-03-31	3006
2005-06-30	2370
2005-09-30	3909
2005-12-31	3852
2006-03-31	5415
2006-06-30	6628
2006-09-30	6374
2006-12-31	4202
2007-03-31	5360
2007-06-30	7087
2007-09-30	7860
2007-12-31	5859
2008-03-31	5796
2008-06-30	3940
2008-09-30	3165
2008-12-31	1402
2009-03-31	2144
2009-06-30	2989
2009-09-30	4939
2009-12-31	2755
2010-03-31	3144
2010-06-30	1418
2010-09-30	2450
2010-12-31	1799
2011-03-31	2408
2011-06-30	2826
2011-09-30	2784
2011-12-31	1781
2012-03-31	2683
2012-06-30	3355
2012-09-30	2212
2012-12-31	4810
2013-03-31	3273
2013-06-30	4523
2013-09-30	5163
2013-12-31	5653
2014-03-31	4912
2014-06-30	4932
2014-09-30	4273
2014-12-31	5169
2015-03-31	5528
2015-06-30	5131
2015-09-30	4234
2015-12-31	4960
2016-03-31	5032
2016-06-30	3921
2016-09-30	4096
2016-12-31	4329
2017-03-31	3958
2017-06-30	4671
2017-09-30	4392
2017-12-31	4334
2018-03-31	5700
2018-06-30	3603
2018-09-30	4052
2018-12-31	3389
2019-03-31	5815
2019-06-30	5873
2019-09-30	7394
2019-12-31	5897
2020-03-31	5837
2020-06-30	5976
2020-09-30	6803
2020-12-31	8623
2021-03-31	5909
2021-06-30	6543
2021-09-30	6497
2021-12-31	6478
2022-03-31	4476
2022-06-30	3974
2022-09-30	2691
2022-12-31	2954
2023-03-31	1917
2023-06-30	4180
2023-09-30	3969