Quarter	US dollars
1999-03-31	-401
1999-06-30	1722
1999-09-30	1053
1999-12-31	-599
2000-03-31	3155
2000-06-30	3046
2000-09-30	4940
2000-12-31	-4114
2001-03-31	2036
2001-06-30	3159
2001-09-30	-3623
2001-12-31	1741
2002-03-31	-56
2002-06-30	2320
2002-09-30	859
2002-12-31	2330
2003-03-31	-147
2003-06-30	-450
2003-09-30	530
2003-12-31	5781
2004-03-31	4365
2004-06-30	7093
2004-09-30	4092
2004-12-31	2097
2005-03-31	17367
2005-06-30	13918
2005-09-30	3274
2005-12-31	15163
2006-03-31	15741
2006-06-30	12047
2006-09-30	10736
2006-12-31	-8436
2007-03-31	22027
2007-06-30	-21049
2007-09-30	26841
2007-12-31	-11265
2008-03-31	-23885
2008-06-30	10410
2008-09-30	22318
2008-12-31	-105446
2009-03-31	7014
2009-06-30	-10633
2009-09-30	1771
2009-12-31	-9772
2010-03-31	10533
2010-06-30	-10006
2010-09-30	7015
2010-12-31	-1134
2011-03-31	14153
2011-06-30	-8234
2011-09-30	-2180
2011-12-31	-414
2012-03-31	874
2012-06-30	2237
2012-09-30	4877
2012-12-31	-13762
2013-03-31	17085
2013-06-30	-2822
2013-09-30	-9131
2013-12-31	1027
2014-03-31	1974
2014-06-30	-4578
2014-09-30	-5785
2014-12-31	-8166
2015-03-31	11120
2015-06-30	-1087
2015-09-30	5754
2015-12-31	-9429
2016-03-31	-5200
2016-06-30	12198
2016-09-30	-1555
2016-12-31	-3122
2017-03-31	6519
2017-06-30	-5418
2017-09-30	-7384
2017-12-31	-1268
2018-03-31	7569
2018-06-30	-6992
2018-09-30	7545
2018-12-31	3965
2019-03-31	6128
2019-06-30	565
2019-09-30	-6723
2019-12-31	3265
2020-03-31	552
2020-06-30	-11385
2020-09-30	-362
2020-12-31	711
2021-03-31	-10024
2021-06-30	5084
2021-09-30	-1276
2021-12-31	-1920
2022-03-31	-2113
2022-06-30	2632
2022-09-30	3824
2022-12-31	-6567
2023-03-31	22
2023-06-30	3064
2023-09-30	2062