Quarter	US dollars
1999-03-31	12647
1999-06-30	12992
1999-09-30	-19131
1999-12-31	-22387
2000-03-31	39699
2000-06-30	-11148
2000-09-30	6565
2000-12-31	1011
2001-03-31	38643
2001-06-30	6306
2001-09-30	-3174
2001-12-31	-7367
2002-03-31	4105
2002-06-30	6780
2002-09-30	7821
2002-12-31	7491
2003-03-31	49303
2003-06-30	48615
2003-09-30	6675
2003-12-31	-4899
2004-03-31	61561
2004-06-30	-17656
2004-09-30	887
2004-12-31	52122
2005-03-31	54906
2005-06-30	10022
2005-09-30	-22973
2005-12-31	45997
2006-03-31	42671
2006-06-30	14077
2006-09-30	-33226
2006-12-31	20075
2007-03-31	40399
2007-06-30	50528
2007-09-30	24030
2007-12-31	-51207
2008-03-31	-15949
2008-06-30	-57744
2008-09-30	10438
2008-12-31	-134713
2009-03-31	-52725
2009-06-30	-26688
2009-09-30	-63535
2009-12-31	40851
2010-03-31	-50733
2010-06-30	-5092
2010-09-30	726
2010-12-31	11212
2011-03-31	8293
2011-06-30	-23273
2011-09-30	2728
2011-12-31	-25667
2012-03-31	25354
2012-06-30	-54272
2012-09-30	5936
2012-12-31	1128
2013-03-31	-42408
2013-06-30	-4823
2013-09-30	-17402
2013-12-31	8626
2014-03-31	17782
2014-06-30	-5313
2014-09-30	-30133
2014-12-31	4697
2015-03-31	19859
2015-06-30	-14836
2015-09-30	-33228
2015-12-31	1927
2016-03-31	8071
2016-06-30	33970
2016-09-30	-6245
2016-12-31	-23968
2017-03-31	19128
2017-06-30	22515
2017-09-30	-13110
2017-12-31	-20392
2018-03-31	-171
2018-06-30	-16835
2018-09-30	-2931
2018-12-31	-3084
2019-03-31	32834
2019-06-30	28395
2019-09-30	-667
2019-12-31	-28462
2020-03-31	75772
2020-06-30	-25453
2020-09-30	16496
2020-12-31	-35700
2021-03-31	-5985
2021-06-30	-14904
2021-09-30	43103
2021-12-31	3374
2022-03-31	8097
2022-06-30	-38469
2022-09-30	1892
2022-12-31	-31436
2023-03-31	8774
2023-06-30	-10683
2023-09-30	12698