Quarter	US dollars
1999-09-30	1359
1999-12-31	2697
2000-03-31	988
2000-06-30	6022
2000-09-30	6451
2000-12-31	5117
2001-03-31	5657
2001-06-30	5683
2001-09-30	5117
2001-12-31	3096
2002-03-31	3687
2002-06-30	4608
2002-09-30	3297
2002-12-31	1810
2003-03-31	2764
2003-06-30	2794
2003-09-30	3025
2003-12-31	3435
2004-03-31	4574
2004-06-30	6276
2004-09-30	6029
2004-12-31	4862
2005-03-31	6452
2005-06-30	6168
2005-09-30	4805
2005-12-31	4826
2006-03-31	5674
2006-06-30	4460
2006-09-30	6686
2006-12-31	8143
2007-03-31	8271
2007-06-30	8837
2007-09-30	6482
2007-12-31	3616
2008-03-31	2763
2008-06-30	4005
2008-09-30	3062
2008-12-31	-3615
2009-03-31	-3780
2009-06-30	-1857
2009-09-30	-2223
2009-12-31	-691
2010-03-31	2091
2010-06-30	900
2010-09-30	1398
2010-12-31	794
2011-03-31	2064
2011-06-30	2183
2011-09-30	5902
2011-12-31	5485
2012-03-31	6688
2012-06-30	7477
2012-09-30	5405
2012-12-31	5263
2013-03-31	2757
2013-06-30	3776
2013-09-30	5239
2013-12-31	7325
2014-03-31	6845
2014-06-30	6331
2014-09-30	7514
2014-12-31	3549
2015-03-31	4850
2015-06-30	5615
2015-09-30	1291
2015-12-31	665
2016-03-31	177
2016-06-30	1090
2016-09-30	677
2016-12-31	831
2017-03-31	786
2017-06-30	2462
2017-09-30	3513
2017-12-31	6015
2018-03-31	4748
2018-06-30	5411
2018-09-30	5586
2018-12-31	2051
2019-03-31	4349
2019-06-30	5540
2019-09-30	2111
2019-12-31	7331
2020-03-31	3107
2020-06-30	1984
2020-09-30	1791
2020-12-31	3538
2021-03-31	3871
2021-06-30	5194
2021-09-30	4966
2021-12-31	5767
2022-03-31	6122
2022-06-30	6655
2022-09-30	8040
2022-12-31	5360
2023-03-31	8965
2023-06-30	7013
2023-09-30	7254
2023-12-31	8259