Quarter	US dollars
1999-03-31	5
1999-06-30	3
1999-09-30	1
1999-12-31	11
2000-03-31	11
2000-06-30	16
2000-09-30	17
2000-12-31	4
2001-03-31	4
2001-06-30	35
2001-09-30	38
2001-12-31	45
2002-03-31	26
2002-06-30	155
2002-09-30	273
2002-12-31	44
2003-03-31	46
2003-06-30	48
2003-09-30	54
2003-12-31	93
2004-03-31	123
2004-06-30	67
2004-09-30	107
2004-12-31	117
2005-03-31	130
2005-06-30	106
2005-09-30	90
2005-12-31	105
2006-03-31	131
2006-06-30	108
2006-09-30	158
2006-12-31	106
2007-03-31	250
2007-06-30	181
2007-09-30	197
2007-12-31	174
2008-03-31	1373
2008-06-30	1365
2008-09-30	1316
2008-12-31	1294
2009-03-31	1298
2009-06-30	1276
2009-09-30	51
2009-12-31	60
2010-03-31	50
2010-06-30	48
2010-09-30	49
2010-12-31	75
2011-03-31	60
2011-06-30	60
2011-09-30	54
2011-12-31	47
2012-03-31	35
2012-06-30	39
2012-09-30	59
2012-12-31	39
2013-03-31	34
2013-06-30	34
2013-09-30	64
2013-12-31	41
2014-03-31	42
2014-06-30	40
2014-09-30	39
2014-12-31	30
2015-03-31	27
2015-06-30	121
2015-09-30	0
2015-12-31	0
2016-03-31	0
2016-06-30	0
2016-09-30	0
2016-12-31	0
2017-03-31	0
2017-06-30	0
2017-09-30	0
2017-12-31	0
2018-03-31	0
2018-06-30	0
2018-09-30	0
2018-12-31	0
2019-03-31	0
2019-06-30	0
2019-09-30	0
2019-12-31	0