Quarter	US dollars
1999-03-31	209
1999-06-30	9
1999-09-30	165
1999-12-31	8
2000-03-31	4
2000-06-30	3
2000-09-30	6
2000-12-31	6
2001-03-31	4
2001-06-30	16
2001-09-30	10
2001-12-31	11
2002-03-31	9
2002-06-30	11
2002-09-30	371
2002-12-31	493
2003-03-31	389
2003-06-30	343
2003-09-30	51
2003-12-31	54
2004-03-31	39
2004-06-30	55
2004-09-30	76
2004-12-31	97
2005-03-31	157
2005-06-30	99
2005-09-30	81
2005-12-31	81
2006-03-31	51
2006-06-30	25
2006-09-30	56
2006-12-31	79
2007-03-31	55
2007-06-30	12
2007-09-30	35
2007-12-31	39
2008-03-31	42
2008-06-30	60
2008-09-30	50
2008-12-31	43
2009-03-31	80
2009-06-30	76
2009-09-30	80
2009-12-31	124
2010-03-31	129
2010-06-30	130
2010-09-30	137
2010-12-31	139
2011-03-31	144
2011-06-30	210
2011-09-30	153
2011-12-31	148
2012-03-31	290
2012-06-30	277
2012-09-30	216
2012-12-31	180
2013-03-31	178
2013-06-30	176
2013-09-30	51
2013-12-31	49
2014-03-31	131
2014-06-30	249
2014-09-30	206
2014-12-31	245
2015-03-31	261
2015-06-30	236
2015-09-30	268
2015-12-31	93
2016-03-31	87
2016-06-30	118
2016-09-30	61
2016-12-31	62
2017-03-31	38
2017-06-30	38
2017-09-30	38
2017-12-31	-1
2018-03-31	6
2018-06-30	20
2018-09-30	8
2018-12-31	6
2019-03-31	20
2019-06-30	5
2019-09-30	5
2019-12-31	24
2020-03-31	113
2020-06-30	201
2020-09-30	209
2020-12-31	465
2021-03-31	235
2021-06-30	241
2021-09-30	290
2021-12-31	130
2022-03-31	54
2022-06-30	51
2022-09-30	49
2022-12-31	86
2023-03-31	54
2023-06-30	53
2023-09-30	606