Quarter	US dollars
1999-03-31	1033
1999-06-30	1028
1999-09-30	1419
1999-12-31	1248
2000-03-31	1216
2000-06-30	871
2000-09-30	791
2000-12-31	798
2001-03-31	809
2001-06-30	680
2001-09-30	744
2001-12-31	640
2002-03-31	665
2002-06-30	665
2002-09-30	784
2002-12-31	743
2003-03-31	638
2003-06-30	533
2003-09-30	508
2003-12-31	513
2004-03-31	465
2004-06-30	565
2004-09-30	624
2004-12-31	387
2005-03-31	636
2005-06-30	413
2005-09-30	354
2005-12-31	372
2006-03-31	435
2006-06-30	772
2006-09-30	1273
2006-12-31	962
2007-03-31	1338
2007-06-30	1797
2007-09-30	2777
2007-12-31	3247
2008-03-31	3278
2008-06-30	4167
2008-09-30	5170
2008-12-31	5352
2009-03-31	4297
2009-06-30	4645
2009-09-30	5892
2009-12-31	5839
2010-03-31	5637
2010-06-30	6542
2010-09-30	8737
2010-12-31	3459
2011-03-31	6565
2011-06-30	6645
2011-09-30	5150
2011-12-31	3346
2012-03-31	4102
2012-06-30	3965
2012-09-30	3578
2012-12-31	2966
2013-03-31	3920
2013-06-30	4142
2013-09-30	3856
2013-12-31	6163
2014-03-31	4883
2014-06-30	5380
2014-09-30	5658
2014-12-31	5013
2015-03-31	4605
2015-06-30	5981
2015-09-30	4981
2015-12-31	3399
2016-03-31	2761
2016-06-30	8031
2016-09-30	7792
2016-12-31	7236
2017-03-31	8988
2017-06-30	4556
2017-09-30	3255
2017-12-31	4860
2018-03-31	5656
2018-06-30	1520
2018-09-30	2233
2018-12-31	2220
2019-03-31	2563
2019-06-30	2183
2019-09-30	1571
2019-12-31	1161
2020-03-31	978
2020-06-30	2311
2020-09-30	2212
2020-12-31	4261
2021-03-31	-343
2021-06-30	-415
2021-09-30	-432
2021-12-31	-630
2022-03-31	226
2022-06-30	-430
2022-09-30	-65
2022-12-31	-323
2023-03-31	264
2023-06-30	-43
2023-09-30	3248