Quarter	US dollars
2004-12-31	4775
2005-03-31	3911
2005-06-30	4341
2005-09-30	4691
2005-12-31	5550
2006-03-31	5150
2006-06-30	4984
2006-09-30	5627
2006-12-31	6599
2007-03-31	7259
2007-06-30	6808
2007-09-30	7104
2007-12-31	7263
2008-03-31	6682
2008-06-30	6573
2008-09-30	6400
2008-12-31	5978
2009-03-31	5615
2009-06-30	5217
2009-09-30	5745
2009-12-31	5251
2010-03-31	6082
2010-06-30	4525
2010-09-30	5009
2010-12-31	4811
2011-03-31	4548
2011-06-30	3921
2011-09-30	3396
2011-12-31	2996
2012-03-31	2909
2012-06-30	3178
2012-09-30	3332
2012-12-31	3586
2013-03-31	3085
2013-06-30	3376
2013-09-30	3658
2013-12-31	3912
2014-03-31	3581
2014-06-30	3804
2014-09-30	3860
2014-12-31	3941
2015-03-31	4144
2015-06-30	3915
2015-09-30	3994
2015-12-31	3946
2016-03-31	3422
2016-06-30	3661
2016-09-30	4016
2016-12-31	3887
2017-03-31	3657
2017-06-30	4087
2017-09-30	4022
2017-12-31	4362
2018-03-31	4935
2018-06-30	4942
2018-09-30	4627
2018-12-31	4416
2019-03-31	4069
2019-06-30	4044
2019-09-30	4183
2019-12-31	4832
2020-03-31	3816
2020-06-30	3453
2020-09-30	3347
2020-12-31	3762
2021-03-31	4326
2021-06-30	3386
2021-09-30	3475
2021-12-31	3736
2022-03-31	3260
2022-06-30	3177
2022-09-30	3663
2022-12-31	4043
2023-03-31	4406
2023-06-30	4005
2023-09-30	4329