Quarter	US dollars
1999-03-31	-14550
1999-06-30	-32566
1999-09-30	35633
1999-12-31	-7072
2000-03-31	82212
2000-06-30	20620
2000-09-30	6864
2000-12-31	85874
2001-03-31	93716
2001-06-30	-64310
2001-09-30	2391
2001-12-31	48274
2002-03-31	-79346
2002-06-30	-14891
2002-09-30	30072
2002-12-31	104084
2003-03-31	-17566
2003-06-30	91970
2003-09-30	-95085
2003-12-31	112742
2004-03-31	180415
2004-06-30	23804
2004-09-30	-15935
2004-12-31	-19126
2005-03-31	137655
2005-06-30	82228
2005-09-30	3737
2005-12-31	54048
2006-03-31	148968
2006-06-30	25742
2006-09-30	58616
2006-12-31	-46210
2007-03-31	335961
2007-06-30	1153
2007-09-30	120132
2007-12-31	205723
2008-03-31	251359
2008-06-30	-355201
2008-09-30	56691
2008-12-31	-103270
2009-03-31	-58880
2009-06-30	-17986
2009-09-30	-153007
2009-12-31	25909
2010-03-31	67478
2010-06-30	41514
2010-09-30	7161
2010-12-31	-175046
2011-03-31	-1083
2011-06-30	-79313
2011-09-30	159898
2011-12-31	-113840
2012-03-31	81115
2012-06-30	-137740
2012-09-30	-29919
2012-12-31	-116634
2013-03-31	-93485
2013-06-30	-73037
2013-09-30	-127219
2013-12-31	-107330
2014-03-31	16917
2014-06-30	-27031
2014-09-30	32150
2014-12-31	-211
2015-03-31	-8565
2015-06-30	-16408
2015-09-30	-17413
2015-12-31	36553
2016-03-31	-69110
2016-06-30	95595
2016-09-30	48426
2016-12-31	48784
2017-03-31	-40895
2017-06-30	44389
2017-09-30	26081
2017-12-31	83425
2018-03-31	-1037
2018-06-30	-26176
2018-09-30	-50921
2018-12-31	44627
2019-03-31	-24436
2019-06-30	-5969
2019-09-30	4942
2019-12-31	-61397
2020-03-31	238140
2020-06-30	-115823
2020-09-30	36747
2020-12-31	51464
2021-03-31	107882
2021-06-30	38
2021-09-30	3343
2021-12-31	67377
2022-03-31	133463
2022-06-30	99977
2022-09-30	20987
2022-12-31	-147047
2023-03-31	51977
2023-06-30	-29522
2023-09-30	50694