Quarter	US dollars
1999-03-31	1801
1999-06-30	-3199
1999-09-30	-3222
1999-12-31	-3948
2000-03-31	2885
2000-06-30	-4165
2000-09-30	890
2000-12-31	-1930
2001-03-31	-1594
2001-06-30	-505
2001-09-30	-2622
2001-12-31	-2241
2002-03-31	6766
2002-06-30	937
2002-09-30	-657
2002-12-31	1068
2003-03-31	5227
2003-06-30	-2958
2003-09-30	11081
2003-12-31	2310
2004-03-31	24355
2004-06-30	-2630
2004-09-30	10338
2004-12-31	9412
2005-03-31	10138
2005-06-30	-4878
2005-09-30	22975
2005-12-31	3881
2006-03-31	43886
2006-06-30	-8708
2006-09-30	29507
2006-12-31	-12026
2007-03-31	39805
2007-06-30	40741
2007-09-30	13042
2007-12-31	26240
2008-03-31	34874
2008-06-30	-19727
2008-09-30	-4844
2008-12-31	-54447
2009-03-31	-18856
2009-06-30	5004
2009-09-30	-5449
2009-12-31	4608
2010-03-31	20516
2010-06-30	12504
2010-09-30	17619
2010-12-31	-1189
2011-03-31	32182
2011-06-30	15322
2011-09-30	-31411
2011-12-31	3589
2012-03-31	8724
2012-06-30	-9759
2012-09-30	8815
2012-12-31	10416
2013-03-31	39436
2013-06-30	-7338
2013-09-30	5249
2013-12-31	-8772
2014-03-31	17864
2014-06-30	-6920
2014-09-30	-6575
2014-12-31	-21541
2015-03-31	-2161
2015-06-30	4762
2015-09-30	-7225
2015-12-31	-67
2016-03-31	-28961
2016-06-30	7771
2016-09-30	-5395
2016-12-31	-8742
2017-03-31	12367
2017-06-30	-830
2017-09-30	16928
2017-12-31	20526
2018-03-31	13207
2018-06-30	-22344
2018-09-30	8459
2018-12-31	14254
2019-03-31	17580
2019-06-30	-1364
2019-09-30	-12553
2019-12-31	15301
2020-03-31	-3593
2020-06-30	-32483
2020-09-30	4611
2020-12-31	28630
2021-03-31	-4148
2021-06-30	-8966
2021-09-30	-404
2021-12-31	35310
2022-03-31	-7317
2022-06-30	-6695
2022-09-30	27799
2022-12-31	-13754
2023-03-31	-8462
2023-06-30	-2070
2023-09-30	-3375