Quarter	US dollars
1999-03-31	6486
1999-06-30	-9306
1999-09-30	766
1999-12-31	-4761
2000-03-31	7224
2000-06-30	24488
2000-09-30	8267
2000-12-31	9756
2001-03-31	17354
2001-06-30	790
2001-09-30	7144
2001-12-31	-20857
2002-03-31	40590
2002-06-30	-10412
2002-09-30	9311
2002-12-31	-19951
2003-03-31	13838
2003-06-30	17163
2003-09-30	22583
2003-12-31	4575
2004-03-31	27977
2004-06-30	17722
2004-09-30	14836
2004-12-31	28808
2005-03-31	24449
2005-06-30	54703
2005-09-30	1341
2005-12-31	8350
2006-03-31	26524
2006-06-30	41949
2006-09-30	-10015
2006-12-31	27009
2007-03-31	-2690
2007-06-30	46889
2007-09-30	71750
2007-12-31	37818
2008-03-31	-14953
2008-06-30	-38076
2008-09-30	6809
2008-12-31	-107369
2009-03-31	33732
2009-06-30	-77150
2009-09-30	19092
2009-12-31	32447
2010-03-31	-9642
2010-06-30	-24075
2010-09-30	19891
2010-12-31	17068
2011-03-31	14535
2011-06-30	10883
2011-09-30	-13706
2011-12-31	-916
2012-03-31	-22172
2012-06-30	-9309
2012-09-30	-22645
2012-12-31	-6324
2013-03-31	12395
2013-06-30	-35479
2013-09-30	13040
2013-12-31	39929
2014-03-31	47423
2014-06-30	48489
2014-09-30	2510
2014-12-31	-40761
2015-03-31	-8701
2015-06-30	-13670
2015-09-30	-13082
2015-12-31	-29192
2016-03-31	1462
2016-06-30	32324
2016-09-30	-611
2016-12-31	-6149
2017-03-31	-646
2017-06-30	-15670
2017-09-30	16370
2017-12-31	14349
2018-03-31	11674
2018-06-30	-12193
2018-09-30	-21137
2018-12-31	7867
2019-03-31	3875
2019-06-30	3246
2019-09-30	-20813
2019-12-31	349
2020-03-31	45296
2020-06-30	-63091
2020-09-30	-7922
2020-12-31	26312
2021-03-31	22914
2021-06-30	-3125
2021-09-30	21222
2021-12-31	-2533
2022-03-31	21401
2022-06-30	-11656
2022-09-30	-3469
2022-12-31	-8275
2023-03-31	34331
2023-06-30	-12362
2023-09-30	-39734