Quarter	US dollars
1999-03-31	-10241
1999-06-30	2125
1999-09-30	27963
1999-12-31	14564
2000-03-31	27064
2000-06-30	-1780
2000-09-30	16094
2000-12-31	54641
2001-03-31	-14710
2001-06-30	-29324
2001-09-30	2192
2001-12-31	24101
2002-03-31	-13577
2002-06-30	17020
2002-09-30	14052
2002-12-31	26111
2003-03-31	28531
2003-06-30	28080
2003-09-30	-29610
2003-12-31	57745
2004-03-31	46646
2004-06-30	27579
2004-09-30	14425
2004-12-31	-24079
2005-03-31	37789
2005-06-30	71534
2005-09-30	-40069
2005-12-31	13266
2006-03-31	92492
2006-06-30	69843
2006-09-30	-40442
2006-12-31	4056
2007-03-31	218928
2007-06-30	-37090
2007-09-30	-22001
2007-12-31	-14804
2008-03-31	-39480
2008-06-30	-190005
2008-09-30	-32449
2008-12-31	-103773
2009-03-31	-10533
2009-06-30	-45526
2009-09-30	13174
2009-12-31	-51222
2010-03-31	9978
2010-06-30	25543
2010-09-30	31033
2010-12-31	-33753
2011-03-31	-76433
2011-06-30	54693
2011-09-30	-3289
2011-12-31	36860
2012-03-31	15619
2012-06-30	8
2012-09-30	6222
2012-12-31	-35241
2013-03-31	-3282
2013-06-30	-30818
2013-09-30	-6508
2013-12-31	-19992
2014-03-31	-19562
2014-06-30	35335
2014-09-30	12094
2014-12-31	-3973
2015-03-31	-17063
2015-06-30	-76981
2015-09-30	-4693
2015-12-31	-2622
2016-03-31	-30503
2016-06-30	2334
2016-09-30	28048
2016-12-31	-20222
2017-03-31	-6959
2017-06-30	5089
2017-09-30	4757
2017-12-31	-15801
2018-03-31	-8320
2018-06-30	10474
2018-09-30	-26380
2018-12-31	26554
2019-03-31	15630
2019-06-30	-5941
2019-09-30	17473
2019-12-31	-3973
2020-03-31	9120
2020-06-30	-17394
2020-09-30	14328
2020-12-31	-18466
2021-03-31	23968
2021-06-30	-15056
2021-09-30	22660
2021-12-31	17670
2022-03-31	16525
2022-06-30	2005
2022-09-30	-5705
2022-12-31	-21918
2023-03-31	12335
2023-06-30	-20930
2023-09-30	6196