Quarter	US dollars
1999-03-31	-35846
1999-06-30	5152
1999-09-30	32149
1999-12-31	-18562
2000-03-31	117682
2000-06-30	31674
2000-09-30	15600
2000-12-31	73074
2001-03-31	147242
2001-06-30	-49525
2001-09-30	20177
2001-12-31	25722
2002-03-31	18811
2002-06-30	26250
2002-09-30	44091
2002-12-31	80632
2003-03-31	100869
2003-06-30	113985
2003-09-30	-74114
2003-12-31	30715
2004-03-31	231791
2004-06-30	7086
2004-09-30	47776
2004-12-31	71236
2005-03-31	212258
2005-06-30	76553
2005-09-30	67884
2005-12-31	-24787
2006-03-31	275494
2006-06-30	24465
2006-09-30	34699
2006-12-31	7525
2007-03-31	479248
2007-06-30	69625
2007-09-30	147409
2007-12-31	211511
2008-03-31	245280
2008-06-30	-448435
2008-09-30	71545
2008-12-31	-350879
2009-03-31	-42466
2009-06-30	-132120
2009-09-30	-52957
2009-12-31	-25016
2010-03-31	102445
2010-06-30	-5534
2010-09-30	30505
2010-12-31	-581
2011-03-31	25759
2011-06-30	-10389
2011-09-30	113698
2011-12-31	-41648
2012-03-31	89212
2012-06-30	-46809
2012-09-30	41531
2012-12-31	-37691
2013-03-31	-87381
2013-06-30	-77898
2013-09-30	-192720
2013-12-31	-55685
2014-03-31	-31656
2014-06-30	-8340
2014-09-30	-15530
2014-12-31	-39411
2015-03-31	14037
2015-06-30	-112352
2015-09-30	-71019
2015-12-31	4183
2016-03-31	-38506
2016-06-30	91309
2016-09-30	-97993
2016-12-31	-23927
2017-03-31	49951
2017-06-30	101959
2017-09-30	-51488
2017-12-31	96792
2018-03-31	66121
2018-06-30	-76288
2018-09-30	-40503
2018-12-31	96075
2019-03-31	76644
2019-06-30	-33677
2019-09-30	105644
2019-12-31	-119703
2020-03-31	387033
2020-06-30	-133904
2020-09-30	84590
2020-12-31	190633
2021-03-31	43410
2021-06-30	-98355
2021-09-30	-16736
2021-12-31	74812
2022-03-31	133472
2022-06-30	8612
2022-09-30	-49115
2022-12-31	-79792
2023-03-31	11422
2023-06-30	-54165
2023-09-30	64539