Quarter	US dollars
1999-03-31	20
1999-06-30	23
1999-09-30	7
1999-12-31	11
2000-03-31	5
2000-06-30	5
2000-09-30	5
2000-12-31	29
2001-03-31	10
2001-06-30	15
2001-09-30	12
2001-12-31	8
2002-03-31	9
2002-06-30	6
2002-09-30	7
2002-12-31	5
2003-03-31	5
2003-06-30	4
2003-09-30	5
2003-12-31	15
2004-03-31	13
2004-06-30	16
2004-09-30	10
2004-12-31	6
2005-03-31	6
2005-06-30	4
2005-09-30	2
2005-12-31	50
2006-03-31	21
2006-06-30	20
2006-09-30	24
2006-12-31	44
2007-03-31	39
2007-06-30	58
2007-09-30	78
2007-12-31	118
2008-03-31	220
2008-06-30	274
2008-09-30	273
2008-12-31	243
2009-03-31	244
2009-06-30	213
2009-09-30	222
2009-12-31	247
2010-03-31	174
2010-06-30	133
2010-09-30	154
2010-12-31	195
2011-03-31	259
2011-06-30	268
2011-09-30	165
2011-12-31	135
2012-03-31	146
2012-06-30	156
2012-09-30	238
2012-12-31	237
2013-03-31	258
2013-06-30	180
2013-09-30	191
2013-12-31	164
2014-03-31	197
2014-06-30	138
2014-09-30	203
2014-12-31	105
2015-03-31	71
2015-06-30	149
2015-09-30	126
2015-12-31	112
2016-03-31	72
2016-06-30	72
2016-09-30	73
2016-12-31	71
2017-03-31	83
2017-06-30	76
2017-09-30	53
2017-12-31	70
2018-03-31	60
2018-06-30	44
2018-09-30	33
2018-12-31	93
2019-03-31	32
2019-06-30	33
2019-09-30	58
2019-12-31	21
2020-03-31	13
2020-06-30	16
2020-09-30	21
2020-12-31	21
2021-03-31	16
2021-06-30	86
2021-09-30	69
2021-12-31	35
2022-03-31	25
2022-06-30	26
2022-09-30	32
2022-12-31	27
2023-03-31	39
2023-06-30	32
2023-09-30	28