Quarter	US dollars
1999-03-31	-1018
1999-06-30	2927
1999-09-30	-430
1999-12-31	198
2000-03-31	4837
2000-06-30	-2528
2000-09-30	-224
2000-12-31	-1395
2001-03-31	1490
2001-06-30	717
2001-09-30	1166
2001-12-31	-2413
2002-03-31	5905
2002-06-30	-3522
2002-09-30	2786
2002-12-31	-6884
2003-03-31	7723
2003-06-30	-891
2003-09-30	2144
2003-12-31	-2364
2004-03-31	2648
2004-06-30	6051
2004-09-30	-759
2004-12-31	-6648
2005-03-31	5271
2005-06-30	-260
2005-09-30	3654
2005-12-31	-7097
2006-03-31	2069
2006-06-30	-2245
2006-09-30	-2781
2006-12-31	2753
2007-03-31	-691
2007-06-30	1229
2007-09-30	4462
2007-12-31	-5126
2008-03-31	597
2008-06-30	-1950
2008-09-30	6347
2008-12-31	-6167
2009-03-31	3344
2009-06-30	-2309
2009-09-30	-3029
2009-12-31	1127
2010-03-31	1390
2010-06-30	1141
2010-09-30	-3375
2010-12-31	-1315
2011-03-31	3105
2011-06-30	-3578
2011-09-30	11034
2011-12-31	-5984
2012-03-31	4282
2012-06-30	-1631
2012-09-30	1504
2012-12-31	-956
2013-03-31	-1225
2013-06-30	2497
2013-09-30	-1586
2013-12-31	-3283
2014-03-31	8293
2014-06-30	-2391
2014-09-30	-3066
2014-12-31	-3771
2015-03-31	1976
2015-06-30	-686
2015-09-30	-1130
2015-12-31	-1643
2016-03-31	8656
2016-06-30	-812
2016-09-30	5025
2016-12-31	-3237
2017-03-31	4393
2017-06-30	-929
2017-09-30	20
2017-12-31	2083
2018-03-31	2654
2018-06-30	6438
2018-09-30	682
2018-12-31	-7206
2019-03-31	7069
2019-06-30	1683
2019-09-30	-8761
2019-12-31	3051
2020-03-31	1613
2020-06-30	3
2020-09-30	7043
2020-12-31	-6292
2021-03-31	4448
2021-06-30	-281
2021-09-30	-2685
2021-12-31	-1306
2022-03-31	8802
2022-06-30	-6058
2022-09-30	1509
2022-12-31	-5158
2023-03-31	4709
2023-06-30	5151
2023-09-30	-3085