Quarter	US dollars
2004-12-31	4951
2005-03-31	4149
2005-06-30	4429
2005-09-30	3737
2005-12-31	3030
2006-03-31	3387
2006-06-30	3486
2006-09-30	3839
2006-12-31	3491
2007-03-31	4872
2007-06-30	5251
2007-09-30	6259
2007-12-31	9208
2008-03-31	6839
2008-06-30	7879
2008-09-30	7487
2008-12-31	6959
2009-03-31	9759
2009-06-30	9571
2009-09-30	7163
2009-12-31	8005
2010-03-31	4110
2010-06-30	5662
2010-09-30	4604
2010-12-31	5462
2011-03-31	8643
2011-06-30	6032
2011-09-30	4730
2011-12-31	4233
2012-03-31	4032
2012-06-30	2784
2012-09-30	3291
2012-12-31	3646
2013-03-31	9563
2013-06-30	14999
2013-09-30	20451
2013-12-31	25605
2014-03-31	18459
2014-06-30	17136
2014-09-30	16077
2014-12-31	20226
2015-03-31	11716
2015-06-30	10315
2015-09-30	10648
2015-12-31	9046
2016-03-31	10273
2016-06-30	10121
2016-09-30	7526
2016-12-31	7863
2017-03-31	6776
2017-06-30	3615
2017-09-30	3278
2017-12-31	4858
2018-03-31	4005
2018-06-30	3953
2018-09-30	3535
2018-12-31	3597
2019-03-31	3437
2019-06-30	2964
2019-09-30	2980
2019-12-31	2836
2020-03-31	3255
2020-06-30	2872
2020-09-30	2187
2020-12-31	2726
2021-03-31	2708
2021-06-30	7109
2021-09-30	8278
2021-12-31	7879
2022-03-31	6228
2022-06-30	3521
2022-09-30	2636
2022-12-31	2682
2023-03-31	2639
2023-06-30	2503
2023-09-30	1967