Quarter	US dollars
1999-03-31	19145
1999-06-30	14461
1999-09-30	-12516
1999-12-31	5280
2000-03-31	7949
2000-06-30	-154
2000-09-30	9167
2000-12-31	24335
2001-03-31	7014
2001-06-30	-9542
2001-09-30	-2662
2001-12-31	36288
2002-03-31	-17274
2002-06-30	-12839
2002-09-30	10564
2002-12-31	19910
2003-03-31	7191
2003-06-30	24782
2003-09-30	10994
2003-12-31	28207
2004-03-31	43397
2004-06-30	-9424
2004-09-30	49783
2004-12-31	37373
2005-03-31	4300
2005-06-30	57036
2005-09-30	-38064
2005-12-31	62251
2006-03-31	50531
2006-06-30	26294
2006-09-30	-10292
2006-12-31	68616
2007-03-31	89670
2007-06-30	43527
2007-09-30	124906
2007-12-31	70261
2008-03-31	70967
2008-06-30	-114018
2008-09-30	38339
2008-12-31	-71377
2009-03-31	-52902
2009-06-30	-82958
2009-09-30	-89402
2009-12-31	-8831
2010-03-31	-49269
2010-06-30	-30163
2010-09-30	32384
2010-12-31	-10171
2011-03-31	-20203
2011-06-30	-7773
2011-09-30	10561
2011-12-31	-9791
2012-03-31	-49070
2012-06-30	-185135
2012-09-30	-6322
2012-12-31	-15765
2013-03-31	-7422
2013-06-30	-21274
2013-09-30	-14565
2013-12-31	1263
2014-03-31	-30669
2014-06-30	36747
2014-09-30	26851
2014-12-31	20340
2015-03-31	14033
2015-06-30	-54329
2015-09-30	-6035
2015-12-31	-16444
2016-03-31	1071
2016-06-30	13434
2016-09-30	44674
2016-12-31	7730
2017-03-31	-43339
2017-06-30	-45447
2017-09-30	61364
2017-12-31	34523
2018-03-31	-40739
2018-06-30	-18773
2018-09-30	-54502
2018-12-31	36078
2019-03-31	-38464
2019-06-30	9686
2019-09-30	-18396
2019-12-31	57743
2020-03-31	-9278
2020-06-30	-38252
2020-09-30	-6022
2020-12-31	6368
2021-03-31	7427
2021-06-30	28666
2021-09-30	17994
2021-12-31	50104
2022-03-31	34641
2022-06-30	34676
2022-09-30	11164
2022-12-31	-73796
2023-03-31	-9278
2023-06-30	9085
2023-09-30	10713