Quarter	US dollars
1999-03-31	3136
1999-06-30	13506
1999-09-30	5638
1999-12-31	18435
2000-03-31	17349
2000-06-30	9098
2000-09-30	7956
2000-12-31	8677
2001-03-31	49550
2001-06-30	-12851
2001-09-30	25652
2001-12-31	33167
2002-03-31	45394
2002-06-30	-3434
2002-09-30	34744
2002-12-31	31058
2003-03-31	36802
2003-06-30	19326
2003-09-30	8821
2003-12-31	-4859
2004-03-31	117568
2004-06-30	-23632
2004-09-30	101077
2004-12-31	-2996
2005-03-31	109049
2005-06-30	-30566
2005-09-30	129492
2005-12-31	-64723
2006-03-31	145274
2006-06-30	-40740
2006-09-30	96628
2006-12-31	-6550
2007-03-31	209386
2007-06-30	6421
2007-09-30	281350
2007-12-31	-280891
2008-03-31	240644
2008-06-30	-208117
2008-09-30	332147
2008-12-31	-415374
2009-03-31	-74884
2009-06-30	-24891
2009-09-30	-1769
2009-12-31	-3738
2010-03-31	91593
2010-06-30	-32979
2010-09-30	5596
2010-12-31	-311
2011-03-31	95533
2011-06-30	-56877
2011-09-30	64773
2011-12-31	-45123
2012-03-31	104723
2012-06-30	21296
2012-09-30	35038
2012-12-31	-27357
2013-03-31	-9299
2013-06-30	470
2013-09-30	-182864
2013-12-31	-83300
2014-03-31	-8475
2014-06-30	-32393
2014-09-30	14211
2014-12-31	-87905
2015-03-31	18139
2015-06-30	-75029
2015-09-30	-37466
2015-12-31	-46423
2016-03-31	31018
2016-06-30	21883
2016-09-30	-42038
2016-12-31	-45861
2017-03-31	57677
2017-06-30	-13433
2017-09-30	-3282
2017-12-31	75691
2018-03-31	28824
2018-06-30	-96041
2018-09-30	-13639
2018-12-31	-6124
2019-03-31	34702
2019-06-30	-6968
2019-09-30	48046
2019-12-31	-33103
2020-03-31	181549
2020-06-30	-147124
2020-09-30	40996
2020-12-31	83974
2021-03-31	-22194
2021-06-30	6622
2021-09-30	-2918
2021-12-31	54753
2022-03-31	63231
2022-06-30	53620
2022-09-30	-18329
2022-12-31	-47323
2023-03-31	69595
2023-06-30	91903
2023-09-30	9654