Quarter	US dollars
1999-03-31	12863
1999-06-30	5403
1999-09-30	571
1999-12-31	934
2000-03-31	11858
2000-06-30	28083
2000-09-30	10123
2000-12-31	-6392
2001-03-31	4394
2001-06-30	6290
2001-09-30	26103
2001-12-31	22319
2002-03-31	-16382
2002-06-30	-11375
2002-09-30	16711
2002-12-31	-10669
2003-03-31	-1632
2003-06-30	17748
2003-09-30	-10925
2003-12-31	12429
2004-03-31	15584
2004-06-30	17233
2004-09-30	14757
2004-12-31	-27580
2005-03-31	1938
2005-06-30	63684
2005-09-30	-33919
2005-12-31	24619
2006-03-31	63285
2006-06-30	19711
2006-09-30	-7089
2006-12-31	4079
2007-03-31	62522
2007-06-30	-4519
2007-09-30	7179
2007-12-31	-60189
2008-03-31	136621
2008-06-30	-114285
2008-09-30	7324
2008-12-31	99525
2009-03-31	68392
2009-06-30	-107330
2009-09-30	-45740
2009-12-31	17202
2010-03-31	37080
2010-06-30	1379
2010-09-30	-10658
2010-12-31	39636
2011-03-31	42814
2011-06-30	-15071
2011-09-30	102400
2011-12-31	-23137
2012-03-31	-57632
2012-06-30	-170885
2012-09-30	4854
2012-12-31	-6108
2013-03-31	10028
2013-06-30	-35656
2013-09-30	-11210
2013-12-31	11631
2014-03-31	-5641
2014-06-30	27659
2014-09-30	33537
2014-12-31	19723
2015-03-31	10445
2015-06-30	-1953
2015-09-30	357
2015-12-31	-27688
2016-03-31	18028
2016-06-30	46324
2016-09-30	-11274
2016-12-31	43432
2017-03-31	549
2017-06-30	18626
2017-09-30	21401
2017-12-31	29947
2018-03-31	43576
2018-06-30	-25453
2018-09-30	-48882
2018-12-31	107146
2019-03-31	68984
2019-06-30	-34819
2019-09-30	6728
2019-12-31	-84432
2020-03-31	223843
2020-06-30	-69021
2020-09-30	886
2020-12-31	75254
2021-03-31	124280
2021-06-30	-57309
2021-09-30	-30008
2021-12-31	-45233
2022-03-31	99150
2022-06-30	-2486
2022-09-30	9415
2022-12-31	-106139
2023-03-31	9123
2023-06-30	-94261
2023-09-30	13924