Quarter	US dollars
1999-09-30	0
1999-12-31	0
2000-03-31	0
2000-06-30	0
2000-09-30	0
2000-12-31	1
2001-03-31	1
2001-06-30	0
2001-09-30	0
2001-12-31	0
2002-03-31	3
2002-06-30	3
2002-09-30	0
2002-12-31	5
2003-03-31	6
2003-06-30	21
2003-09-30	55
2003-12-31	57
2004-03-31	6
2004-06-30	2
2004-09-30	4
2004-12-31	0
2005-03-31	2
2005-06-30	5
2005-09-30	4
2005-12-31	7
2006-03-31	7
2006-06-30	0
2006-09-30	2
2006-12-31	0
2007-03-31	8
2007-06-30	8
2007-09-30	8
2007-12-31	20
2008-03-31	42
2008-06-30	48
2008-09-30	71
2008-12-31	82
2009-03-31	82
2009-06-30	68
2009-09-30	59
2009-12-31	60
2010-03-31	52
2010-06-30	72
2010-09-30	41
2010-12-31	45
2011-03-31	29
2011-06-30	42
2011-09-30	128
2011-12-31	77
2012-03-31	16
2012-06-30	35
2012-09-30	10
2012-12-31	8
2013-03-31	11
2013-06-30	17
2013-09-30	26
2013-12-31	28
2014-03-31	32
2014-06-30	15
2014-09-30	47
2014-12-31	30
2015-03-31	98
2015-06-30	13
2015-09-30	12
2015-12-31	73
2016-03-31	101
2016-06-30	129
2016-09-30	138
2016-12-31	144
2017-03-31	141
2017-06-30	187
2017-09-30	136
2017-12-31	182
2018-03-31	518
2018-06-30	507
2018-09-30	514
2018-12-31	511
2019-03-31	468
2019-06-30	504
2019-09-30	524
2019-12-31	465
2020-03-31	589
2020-06-30	471
2020-09-30	456
2020-12-31	453
2021-03-31	455
2021-06-30	413
2021-09-30	77
2021-12-31	26
2022-03-31	50
2022-06-30	31
2022-09-30	25
2022-12-31	23
2023-03-31	14
2023-06-30	16
2023-09-30	38