Quarter	US dollars
2004-12-31	1814
2005-03-31	1698
2005-06-30	1551
2005-09-30	1695
2005-12-31	1742
2006-03-31	1951
2006-06-30	2184
2006-09-30	1891
2006-12-31	2388
2007-03-31	2242
2007-06-30	2285
2007-09-30	2418
2007-12-31	2190
2008-03-31	8240
2008-06-30	9525
2008-09-30	10313
2008-12-31	9530
2009-03-31	8875
2009-06-30	8521
2009-09-30	7200
2009-12-31	6981
2010-03-31	6410
2010-06-30	5587
2010-09-30	5817
2010-12-31	5349
2011-03-31	5538
2011-06-30	5567
2011-09-30	5732
2011-12-31	5209
2012-03-31	5266
2012-06-30	5178
2012-09-30	5087
2014-03-31	5034
2014-06-30	4907
2014-09-30	4844
2014-12-31	4687
2015-03-31	4660
2015-06-30	4461
2015-09-30	3944
2015-12-31	3905
2016-03-31	3560
2016-06-30	3714
2016-09-30	3640
2016-12-31	3369
2017-03-31	3384
2017-06-30	4055
2017-09-30	3950
2017-12-31	3619
2018-03-31	3656
2018-06-30	3834
2018-09-30	3615
2018-12-31	3518
2019-03-31	3491
2019-06-30	3915
2019-09-30	3722
2019-12-31	3580
2020-03-31	3985
2020-06-30	3852
2020-09-30	3757
2020-12-31	3607
2021-03-31	3699
2021-06-30	3670
2021-09-30	3518
2021-12-31	3606
2022-03-31	3495
2022-06-30	3433
2022-09-30	3081
2022-12-31	2930
2023-03-31	3426
2023-06-30	3485
2023-09-30	3911