Quarter	US dollars
2004-12-31	4734
2005-03-31	4603
2005-06-30	4521
2005-09-30	4013
2005-12-31	3492
2006-03-31	3875
2006-06-30	4039
2006-09-30	4088
2006-12-31	4444
2007-03-31	4468
2007-06-30	4992
2007-09-30	5589
2007-12-31	6383
2008-03-31	7783
2008-06-30	6973
2008-09-30	6537
2008-12-31	6321
2009-03-31	6045
2009-06-30	6518
2009-09-30	6631
2009-12-31	6286
2010-03-31	5970
2010-06-30	7485
2010-09-30	8024
2010-12-31	7865
2011-03-31	7524
2011-06-30	8301
2011-09-30	8625
2011-12-31	8167
2012-03-31	8192
2012-06-30	7562
2012-09-30	7007
2012-12-31	6655
2013-03-31	6068
2013-06-30	5844
2013-09-30	5572
2013-12-31	5781
2014-03-31	5547
2014-06-30	5368
2014-09-30	4893
2014-12-31	4578
2015-03-31	4246
2015-06-30	4571
2015-09-30	4842
2015-12-31	4732
2016-03-31	4815
2016-06-30	4528
2016-09-30	4885
2016-12-31	4441
2017-03-31	4040
2017-06-30	3727
2017-09-30	3734
2017-12-31	3844
2018-03-31	3556
2018-06-30	3538
2018-09-30	3329
2018-12-31	3436
2019-03-31	3830
2019-06-30	4092
2019-09-30	4107
2019-12-31	3933
2020-03-31	4263
2020-06-30	3426
2020-09-30	3391
2020-12-31	3876
2021-03-31	3410
2021-06-30	2938
2021-09-30	3448
2021-12-31	3190
2022-03-31	3023
2022-06-30	2150
2022-09-30	2346
2022-12-31	1695
2023-03-31	1377
2023-06-30	945
2023-09-30	662