Quarter	US dollars
2004-12-31	6251
2005-03-31	4802
2005-06-30	5661
2005-09-30	5954
2005-12-31	6106
2006-03-31	5979
2006-06-30	4984
2006-09-30	4941
2006-12-31	6718
2007-03-31	6835
2007-06-30	6659
2007-09-30	6945
2007-12-31	6932
2008-03-31	6559
2008-06-30	6766
2008-09-30	6972
2008-12-31	5783
2009-03-31	5335
2009-06-30	4878
2009-09-30	5522
2009-12-31	5009
2010-03-31	6018
2010-06-30	5388
2010-09-30	5941
2010-12-31	5509
2011-03-31	6071
2011-06-30	4749
2011-09-30	3932
2011-12-31	3431
2012-03-31	3538
2012-06-30	3776
2012-09-30	4052
2012-12-31	3560
2013-03-31	3150
2013-06-30	3347
2013-09-30	3093
2013-12-31	3349
2014-03-31	3153
2014-06-30	3259
2014-09-30	3338
2014-12-31	3490
2015-03-31	4205
2015-06-30	3937
2015-09-30	4100
2015-12-31	3983
2016-03-31	3456
2016-06-30	3493
2016-09-30	3858
2016-12-31	3905
2017-03-31	3906
2017-06-30	3907
2017-09-30	3900
2017-12-31	3977
2018-03-31	4228
2018-06-30	4230
2018-09-30	3946
2018-12-31	3975
2019-03-31	3647
2019-06-30	3443
2019-09-30	3508
2019-12-31	4037
2020-03-31	3335
2020-06-30	2924
2020-09-30	2705
2020-12-31	2773
2021-03-31	3613
2021-06-30	2988
2021-09-30	3171
2021-12-31	3391
2022-03-31	2955
2022-06-30	3052
2022-09-30	3436
2022-12-31	3986
2023-03-31	4248
2023-06-30	3702
2023-09-30	3856