Quarter	US dollars
1999-09-30	506
1999-12-31	535
2000-03-31	455
2000-06-30	775
2000-09-30	792
2000-12-31	707
2001-03-31	1146
2001-06-30	1054
2001-09-30	825
2001-12-31	1189
2002-03-31	1595
2002-06-30	1024
2002-09-30	1302
2002-12-31	1424
2003-03-31	1584
2003-06-30	1640
2003-09-30	1728
2003-12-31	1970
2004-03-31	1825
2004-06-30	1957
2004-09-30	1905
2004-12-31	2064
2005-03-31	1871
2005-06-30	1416
2005-09-30	1465
2005-12-31	1493
2006-03-31	1254
2006-06-30	1787
2006-09-30	282
2006-12-31	1372
2007-03-31	2432
2007-06-30	3313
2007-09-30	5330
2007-12-31	6170
2008-03-31	8071
2008-06-30	8770
2008-09-30	6296
2008-12-31	8433
2009-03-31	5119
2009-06-30	5910
2009-09-30	3686
2009-12-31	8135
2010-03-31	6115
2010-06-30	14767
2010-09-30	9261
2010-12-31	7959
2011-03-31	9063
2011-06-30	8503
2011-09-30	7537
2011-12-31	7718
2012-03-31	7482
2012-06-30	7871
2012-09-30	7856
2012-12-31	7035
2013-03-31	6180
2013-06-30	5829
2013-09-30	7117
2013-12-31	6786
2014-03-31	6554
2014-06-30	6528
2014-09-30	6660
2014-12-31	7250
2015-03-31	10001
2015-06-30	9087
2015-09-30	9140
2015-12-31	9025
2016-03-31	10057
2016-06-30	10467
2016-09-30	9702
2016-12-31	8120
2017-03-31	9211
2017-06-30	8816
2017-09-30	7655
2017-12-31	8709
2018-03-31	8901
2018-06-30	7689
2018-09-30	8252
2018-12-31	8015
2019-03-31	7668
2019-06-30	8236
2019-09-30	11150
2019-12-31	9309
2020-03-31	11653
2020-06-30	12156
2020-09-30	12182
2020-12-31	12520
2021-03-31	8025
2021-06-30	6144
2021-09-30	4447
2021-12-31	4531
2022-03-31	4912
2022-06-30	4650
2022-09-30	5160
2022-12-31	6197
2023-03-31	4924
2023-06-30	4535
2023-09-30	4404