Quarter	US dollars
2004-12-31	30991
2005-03-31	22931
2005-06-30	31317
2005-09-30	32480
2005-12-31	29644
2006-03-31	27932
2006-06-30	38170
2006-09-30	31130
2006-12-31	36700
2007-03-31	41238
2007-06-30	49303
2007-09-30	61758
2007-12-31	80852
2008-03-31	133747
2008-06-30	139751
2008-09-30	156657
2008-12-31	296150
2009-03-31	272508
2009-06-30	174981
2009-09-30	173526
2009-12-31	135156
2010-03-31	120226
2010-06-30	131878
2010-09-30	134568
2010-12-31	122015
2011-03-31	105383
2011-06-30	111385
2011-09-30	151590
2011-12-31	132827
2012-03-31	111806
2012-06-30	112865
2012-09-30	92162
2012-12-31	75867
2013-03-31	66315
2013-06-30	56931
2013-09-30	41785
2013-12-31	30921
2014-03-31	41499
2014-06-30	44512
2014-09-30	47495
2014-12-31	44985
2015-03-31	46075
2015-06-30	35939
2015-09-30	37180
2015-12-31	29641
2016-03-31	33954
2016-06-30	32008
2016-09-30	25851
2016-12-31	22555
2017-03-31	16956
2017-06-30	15800
2017-09-30	14589
2017-12-31	-3379
2018-03-31	-5925
2018-06-30	-4028
2018-09-30	10501
2018-12-31	10059
2019-03-31	16530
2019-06-30	5613
2019-09-30	6520
2019-12-31	8185
2020-03-31	13080
2020-06-30	12918
2020-09-30	3659
2020-12-31	5925
2021-03-31	6319
2021-06-30	6981
2021-09-30	4835
2021-12-31	4163
2022-03-31	2880
2022-06-30	6032
2022-09-30	6419
2022-12-31	542
2023-03-31	3921
2023-06-30	898
2023-09-30	-294