Quarter	US dollars
1999-03-31	2
1999-06-30	2
1999-09-30	1
1999-12-31	1
2000-03-31	0
2000-06-30	0
2000-09-30	0
2000-12-31	0
2001-03-31	0
2001-06-30	7
2001-09-30	7
2001-12-31	7
2002-03-31	39
2002-06-30	7
2002-09-30	9
2002-12-31	8
2003-03-31	8
2003-06-30	0
2003-09-30	0
2003-12-31	0
2004-03-31	0
2004-06-30	0
2004-09-30	0
2004-12-31	0
2005-03-31	1
2005-06-30	3
2005-09-30	13
2005-12-31	12
2006-03-31	1
2006-06-30	19
2006-09-30	27
2006-12-31	26
2007-03-31	3
2007-06-30	3
2007-09-30	3
2007-12-31	25
2008-03-31	16
2008-06-30	163
2008-09-30	194
2008-12-31	474
2009-03-31	309
2009-06-30	436
2009-09-30	548
2009-12-31	541
2010-03-31	523
2010-06-30	500
2010-09-30	528
2010-12-31	343
2011-03-31	361
2011-06-30	354
2011-09-30	311
2011-12-31	318
2012-03-31	341
2012-06-30	321
2012-09-30	299
2012-12-31	300
2013-03-31	293
2013-06-30	318
2013-09-30	381
2013-12-31	441
2014-03-31	448
2014-06-30	422
2014-09-30	385
2014-12-31	364
2015-03-31	332
2015-06-30	319
2015-09-30	322
2015-12-31	319
2016-03-31	328
2016-06-30	296
2016-09-30	299
2016-12-31	279
2017-03-31	289
2017-06-30	281
2017-09-30	230
2017-12-31	235
2018-03-31	232
2018-06-30	147
2018-09-30	146
2018-12-31	141
2019-03-31	138
2019-06-30	133
2019-09-30	129
2019-12-31	133
2020-03-31	130
2020-06-30	108
2020-09-30	123
2020-12-31	59
2021-03-31	51
2021-06-30	27
2021-09-30	39
2021-12-31	1
2022-03-31	13
2022-06-30	1
2022-09-30	2
2022-12-31	7
2023-03-31	8
2023-06-30	24
2023-09-30	16