Quarter	US dollars
1999-03-31	-71
1999-06-30	-785
1999-09-30	-1719
1999-12-31	-3450
2000-03-31	3171
2000-06-30	-1912
2000-09-30	474
2000-12-31	-3826
2001-03-31	195
2001-06-30	1788
2001-09-30	-2518
2001-12-31	-2004
2002-03-31	5788
2002-06-30	-254
2002-09-30	2681
2002-12-31	-2733
2003-03-31	7830
2003-06-30	-1218
2003-09-30	4225
2003-12-31	604
2004-03-31	12490
2004-06-30	-1333
2004-09-30	9221
2004-12-31	-1406
2005-03-31	8499
2005-06-30	-11047
2005-09-30	14430
2005-12-31	-15004
2006-03-31	16947
2006-06-30	-1709
2006-09-30	12903
2006-12-31	-13839
2007-03-31	22262
2007-06-30	9184
2007-09-30	-5417
2007-12-31	5533
2008-03-31	23909
2008-06-30	-22581
2008-09-30	-8402
2008-12-31	-20863
2009-03-31	-3191
2009-06-30	2059
2009-09-30	4451
2009-12-31	8832
2010-03-31	12597
2010-06-30	6706
2010-09-30	2140
2010-12-31	1004
2011-03-31	18002
2011-06-30	9424
2011-09-30	-4722
2011-12-31	-9510
2012-03-31	-2766
2012-06-30	-3450
2012-09-30	-2764
2012-12-31	3913
2013-03-31	25891
2013-06-30	9473
2013-09-30	-6214
2013-12-31	4223
2014-03-31	16452
2014-06-30	-4762
2014-09-30	-11732
2014-12-31	-16731
2015-03-31	526
2015-06-30	-3193
2015-09-30	-3614
2015-12-31	-10210
2016-03-31	-5772
2016-06-30	-9
2016-09-30	-5837
2016-12-31	1092
2017-03-31	4635
2017-06-30	10875
2017-09-30	9219
2017-12-31	6199
2018-03-31	-3066
2018-06-30	-7803
2018-09-30	12133
2018-12-31	5508
2019-03-31	3584
2019-06-30	-3938
2019-09-30	-11144
2019-12-31	3111
2020-03-31	9607
2020-06-30	-17561
2020-09-30	-73
2020-12-31	7499
2021-03-31	2872
2021-06-30	-3448
2021-09-30	5390
2021-12-31	7749
2022-03-31	-5453
2022-06-30	3008
2022-09-30	9630
2022-12-31	-6371
2023-03-31	-3218
2023-06-30	-10108
2023-09-30	16594