Quarter	US dollars
2004-12-31	8012
2005-03-31	6448
2005-06-30	5490
2005-09-30	6481
2005-12-31	6666
2006-03-31	4877
2006-06-30	6660
2006-09-30	4857
2006-12-31	7740
2007-03-31	8120
2007-06-30	7941
2007-09-30	6890
2007-12-31	6018
2008-03-31	6692
2008-06-30	6721
2008-09-30	9092
2008-12-31	5296
2009-03-31	4597
2009-06-30	3386
2009-09-30	5094
2009-12-31	9191
2010-03-31	7573
2010-06-30	9227
2010-09-30	9998
2010-12-31	9589
2011-03-31	8629
2011-06-30	7638
2011-09-30	6084
2011-12-31	4440
2012-03-31	4109
2012-06-30	4514
2012-09-30	5040
2012-12-31	5028
2013-03-31	3545
2013-06-30	2604
2013-09-30	2358
2013-12-31	2754
2014-03-31	1966
2014-06-30	2460
2014-09-30	966
2014-12-31	2808
2015-03-31	3237
2015-06-30	2007
2015-09-30	2758
2015-12-31	-861
2016-03-31	321
2016-06-30	-289
2016-09-30	839
2016-12-31	2178
2017-03-31	1636
2017-06-30	1487
2017-09-30	1941
2017-12-31	2201
2018-03-31	1819
2018-06-30	1833
2018-09-30	3482
2018-12-31	1191
2019-03-31	7148
2019-06-30	4861
2019-09-30	5099
2019-12-31	4243
2020-03-31	6917
2020-06-30	6040
2020-09-30	4808
2020-12-31	4163
2021-03-31	2525
2021-06-30	3040
2021-09-30	3928
2021-12-31	1458
2022-03-31	526
2022-06-30	709
2022-09-30	20
2022-12-31	48
2023-03-31	1808
2023-06-30	1726
2023-09-30	933