Quarter	US dollars
1999-03-31	263
1999-06-30	282
1999-09-30	339
1999-12-31	369
2000-03-31	351
2000-06-30	371
2000-09-30	527
2000-12-31	434
2001-03-31	406
2001-06-30	449
2001-09-30	531
2001-12-31	768
2002-03-31	910
2002-06-30	2009
2002-09-30	1179
2002-12-31	1108
2003-03-31	3588
2003-06-30	1310
2003-09-30	1999
2003-12-31	1328
2004-03-31	3533
2004-06-30	1640
2004-09-30	3093
2004-12-31	2467
2005-03-31	3249
2005-06-30	3075
2005-09-30	1976
2005-12-31	2192
2006-03-31	1152
2006-06-30	1597
2006-09-30	3696
2006-12-31	3876
2007-03-31	3858
2007-06-30	5286
2007-09-30	6458
2007-12-31	8109
2008-03-31	6159
2008-06-30	4745
2008-09-30	11660
2008-12-31	5352
2009-03-31	1821
2009-06-30	6766
2009-09-30	3516
2009-12-31	2222
2010-03-31	3887
2010-06-30	7269
2010-09-30	7707
2010-12-31	3548
2011-03-31	7713
2011-06-30	4655
2011-09-30	5905
2011-12-31	17133
2012-03-31	5470
2012-06-30	7967
2012-09-30	5814
2012-12-31	5393
2013-03-31	4539
2013-06-30	4102
2013-09-30	4893
2013-12-31	4667
2014-03-31	4254
2014-06-30	4122
2014-09-30	4626
2014-12-31	5946
2015-03-31	5896
2015-06-30	4760
2015-09-30	8091
2015-12-31	7361
2016-03-31	5426
2016-06-30	5727
2016-09-30	6672
2016-12-31	6696
2017-03-31	6497
2017-06-30	5827
2017-09-30	6999
2017-12-31	5280
2018-03-31	5372
2018-06-30	4226
2018-09-30	4392
2018-12-31	5245
2019-03-31	6107
2019-06-30	6310
2019-09-30	6464
2019-12-31	5796
2020-03-31	7519
2020-06-30	7253
2020-09-30	6501
2020-12-31	7207
2021-03-31	7803
2021-06-30	6529
2021-09-30	6573
2021-12-31	6681
2022-03-31	7343
2022-06-30	6983
2022-09-30	7263
2022-12-31	5974
2023-03-31	6828
2023-06-30	8071
2023-09-30	5756