Quarter	US dollars
2004-12-31	1567
2005-03-31	1577
2005-06-30	1726
2005-09-30	1817
2005-12-31	1802
2006-03-31	1991
2006-06-30	1938
2006-09-30	2356
2006-12-31	4368
2007-03-31	4468
2007-06-30	4581
2007-09-30	4315
2007-12-31	4569
2008-03-31	5096
2008-06-30	4163
2008-09-30	4250
2008-12-31	3791
2009-03-31	4046
2009-06-30	4245
2009-09-30	4363
2009-12-31	4457
2010-03-31	4744
2010-06-30	5500
2010-09-30	4856
2010-12-31	4750
2011-03-31	5330
2011-06-30	5356
2011-09-30	5488
2011-12-31	5107
2012-03-31	5312
2012-06-30	4933
2012-09-30	5200
2012-12-31	4799
2013-03-31	4987
2013-06-30	4984
2013-09-30	5180
2013-12-31	4706
2014-03-31	5022
2014-06-30	5050
2014-09-30	4912
2014-12-31	4789
2015-03-31	5046
2015-06-30	4621
2015-09-30	4509
2015-12-31	4320
2016-03-31	4438
2016-06-30	4450
2016-09-30	4540
2016-12-31	4648
2017-03-31	4886
2017-06-30	4793
2017-09-30	4908
2017-12-31	4552
2018-03-31	4631
2018-06-30	4412
2018-09-30	4241
2018-12-31	3895
2019-03-31	3848
2019-06-30	3494
2019-09-30	3526
2019-12-31	3635
2020-03-31	3639
2020-06-30	3772
2020-09-30	3497
2020-12-31	3569
2021-03-31	4400
2021-06-30	4537
2021-09-30	4311
2021-12-31	4530
2022-03-31	4195
2022-06-30	3870
2022-09-30	3606
2022-12-31	3177
2023-03-31	2497
2023-06-30	2473
2023-09-30	2448