Quarter	US dollars
1999-03-31	-6186
1999-06-30	2087
1999-09-30	-3768
1999-12-31	-2385
2000-03-31	5005
2000-06-30	4702
2000-09-30	-3092
2000-12-31	-1057
2001-03-31	7424
2001-06-30	2616
2001-09-30	-5078
2001-12-31	-3981
2002-03-31	-2499
2002-06-30	-3400
2002-09-30	-5943
2002-12-31	-4349
2003-03-31	-2891
2003-06-30	2926
2003-09-30	-4493
2003-12-31	-1371
2004-03-31	-932
2004-06-30	1628
2004-09-30	-4778
2004-12-31	3685
2005-03-31	-491
2005-06-30	-2905
2005-09-30	1149
2005-12-31	5416
2006-03-31	-1604
2006-06-30	2635
2006-09-30	4476
2006-12-31	1207
2007-03-31	5642
2007-06-30	-1941
2007-09-30	-4036
2007-12-31	-9361
2008-03-31	10497
2008-06-30	3778
2008-09-30	1938
2008-12-31	-22
2009-03-31	-6705
2009-06-30	-3397
2009-09-30	-14291
2009-12-31	7124
2010-03-31	6244
2010-06-30	288
2010-09-30	-4563
2010-12-31	3822
2011-03-31	-4937
2011-06-30	-5143
2011-09-30	-9572
2011-12-31	-6305
2012-03-31	7902
2012-06-30	-9865
2012-09-30	-1463
2012-12-31	4541
2013-03-31	-2794
2013-06-30	-5702
2013-09-30	903
2013-12-31	-4401
2014-03-31	263
2014-06-30	-389
2014-09-30	-3029
2014-12-31	-2727
2015-03-31	-1890
2015-06-30	-554
2015-09-30	-1479
2015-12-31	1161
2016-03-31	-184
2016-06-30	881
2016-09-30	-1840
2016-12-31	2065
2017-03-31	4384
2017-06-30	-1467
2017-09-30	724
2017-12-31	777
2018-03-31	-3190
2018-06-30	-82
2018-09-30	-5088
2018-12-31	-1754
2019-03-31	1408
2019-06-30	1815
2019-09-30	948
2019-12-31	1842
2020-03-31	366
2020-06-30	-1195
2020-09-30	-3405
2020-12-31	-3657
2021-03-31	-1143
2021-06-30	-1928
2021-09-30	-2499
2021-12-31	-507
2022-03-31	-427
2022-06-30	-1763
2022-09-30	-2543
2022-12-31	-3420
2023-03-31	110
2023-06-30	-71
2023-09-30	-36