Quarter	US dollars
1999-03-31	-9734
1999-06-30	-3110
1999-09-30	2500
1999-12-31	1027
2000-03-31	4191
2000-06-30	3477
2000-09-30	9428
2000-12-31	4632
2001-03-31	10984
2001-06-30	-93
2001-09-30	283
2001-12-31	-8320
2002-03-31	-7476
2002-06-30	811
2002-09-30	-2030
2002-12-31	5735
2003-03-31	5670
2003-06-30	-6311
2003-09-30	2447
2003-12-31	3722
2004-03-31	7905
2004-06-30	-606
2004-09-30	18834
2004-12-31	-8473
2005-03-31	1348
2005-06-30	13948
2005-09-30	19580
2005-12-31	-1282
2006-03-31	17243
2006-06-30	5711
2006-09-30	22482
2006-12-31	4552
2007-03-31	3518
2007-06-30	3182
2007-09-30	18754
2007-12-31	52402
2008-03-31	126
2008-06-30	-32343
2008-09-30	16816
2008-12-31	-18652
2009-03-31	-41457
2009-06-30	-1862
2009-09-30	-617
2009-12-31	10564
2010-03-31	-4854
2010-06-30	-1802
2010-09-30	-16065
2010-12-31	11103
2011-03-31	22732
2011-06-30	2328
2011-09-30	59
2011-12-31	6485
2012-03-31	40722
2012-06-30	18439
2012-09-30	-33730
2012-12-31	-16183
2013-03-31	9505
2013-06-30	-13223
2013-09-30	9213
2013-12-31	-3989
2014-03-31	11578
2014-06-30	-4115
2014-09-30	883
2014-12-31	-8341
2015-03-31	-12199
2015-06-30	7614
2015-09-30	7724
2015-12-31	-9109
2016-03-31	-8870
2016-06-30	5110
2016-09-30	-4434
2016-12-31	-466
2017-03-31	22891
2017-06-30	2442
2017-09-30	3076
2017-12-31	2064
2018-03-31	24310
2018-06-30	-21054
2018-09-30	1804
2018-12-31	-672
2019-03-31	13445
2019-06-30	18500
2019-09-30	-6658
2019-12-31	-2036
2020-03-31	11918
2020-06-30	-36535
2020-09-30	-8853
2020-12-31	-2310
2021-03-31	-3617
2021-06-30	-2564
2021-09-30	16123
2021-12-31	-11441
2022-03-31	17721
2022-06-30	16996
2022-09-30	9484
2022-12-31	-13400
2023-03-31	22339
2023-06-30	9810
2023-09-30	-15019