Quarter	US dollars
2004-12-31	-7142
2005-03-31	-8049
2005-06-30	-10113
2005-09-30	-6440
2005-12-31	-9104
2006-03-31	-8338
2006-06-30	-9928
2006-09-30	-10983
2006-12-31	-10889
2007-03-31	-8443
2007-06-30	-15670
2007-09-30	-9344
2007-12-31	-14526
2008-03-31	-19068
2008-06-30	-15891
2008-09-30	-12918
2008-12-31	-10099
2009-03-31	-13142
2009-06-30	-10121
2009-09-30	-5011
2009-12-31	-4147
2010-03-31	2093
2010-06-30	1460
2010-09-30	5406
2010-12-31	9866
2011-03-31	6143
2011-06-30	12474
2011-09-30	9567
2011-12-31	8522
2012-03-31	8660
2012-06-30	11270
2012-09-30	11781
2012-12-31	16640
2013-03-31	20927
2013-06-30	21895
2013-09-30	20589
2013-12-31	18771
2014-03-31	18934
2014-06-30	17707
2014-09-30	18610
2014-12-31	14319
2015-03-31	17597
2015-06-30	17882
2015-09-30	15161
2015-12-31	20093
2016-03-31	18857
2016-06-30	19753
2016-09-30	15744
2016-12-31	13325
2017-03-31	20749
2017-06-30	7929
2017-09-30	1486
2017-12-31	-2552
2018-03-31	438
2018-06-30	1910
2018-09-30	5104
2018-12-31	6245
2019-03-31	7987
2019-06-30	3504
2019-09-30	4462
2019-12-31	1018
2020-03-31	8201
2020-06-30	6198
2020-09-30	9309
2020-12-31	7355
2021-03-31	12447
2021-06-30	10569
2021-09-30	10217
2021-12-31	9376
2022-03-31	8307
2022-06-30	8163
2022-09-30	11219
2022-12-31	8073
2023-03-31	9089
2023-06-30	12466
2023-09-30	10368