Quarter	US dollars
2004-12-31	6224
2005-03-31	5240
2005-06-30	4368
2005-09-30	4266
2005-12-31	3967
2006-03-31	4480
2006-06-30	4459
2006-09-30	5098
2006-12-31	5133
2007-03-31	5264
2007-06-30	5160
2007-09-30	5034
2007-12-31	5142
2008-03-31	6634
2008-06-30	5672
2008-09-30	6056
2008-12-31	6922
2009-03-31	6092
2009-06-30	6052
2009-09-30	7104
2009-12-31	7299
2010-03-31	6854
2010-06-30	7080
2010-09-30	8405
2010-12-31	7467
2011-03-31	8265
2011-06-30	7426
2011-09-30	7212
2011-12-31	7709
2012-03-31	7337
2012-06-30	6841
2012-09-30	6274
2012-12-31	7505
2013-03-31	6781
2013-06-30	7599
2013-09-30	8254
2013-12-31	7157
2014-03-31	6482
2014-06-30	6664
2014-09-30	6841
2014-12-31	6598
2015-03-31	6859
2015-06-30	6811
2015-09-30	6389
2015-12-31	6215
2016-03-31	6062
2016-06-30	6030
2016-09-30	5819
2016-12-31	4734
2017-03-31	5023
2017-06-30	4443
2017-09-30	4800
2017-12-31	4774
2018-03-31	4955
2018-06-30	4702
2018-09-30	4645
2018-12-31	4550
2019-03-31	4865
2019-06-30	5526
2019-09-30	5713
2019-12-31	5708
2020-03-31	5041
2020-06-30	5281
2020-09-30	4739
2020-12-31	4818
2021-03-31	4764
2021-06-30	4752
2021-09-30	4397
2021-12-31	4770
2022-03-31	4946
2022-06-30	4747
2022-09-30	4631
2022-12-31	4857
2023-03-31	4686
2023-06-30	4838
2023-09-30	4368