Quarter	US dollars
1999-03-31	31
1999-06-30	43
1999-09-30	1
1999-12-31	1
2000-03-31	1
2000-06-30	1
2000-09-30	1
2000-12-31	1
2001-03-31	1
2001-06-30	4
2001-09-30	3
2001-12-31	3
2002-03-31	1
2002-06-30	3
2002-09-30	1
2002-12-31	1
2003-03-31	1
2003-06-30	13
2003-09-30	2
2003-12-31	1
2004-03-31	4
2004-06-30	1
2004-09-30	3
2004-12-31	3
2005-03-31	3
2005-06-30	3
2005-09-30	4
2005-12-31	4
2006-03-31	6
2006-06-30	18
2006-09-30	146
2006-12-31	21
2007-03-31	21
2007-06-30	28
2007-09-30	114
2007-12-31	71
2008-03-31	81
2008-06-30	65
2008-09-30	103
2008-12-31	124
2009-03-31	158
2009-06-30	156
2009-09-30	154
2009-12-31	195
2010-03-31	179
2010-06-30	191
2010-09-30	189
2010-12-31	227
2011-03-31	121
2011-06-30	17
2011-09-30	15
2011-12-31	19
2012-03-31	14
2012-06-30	14
2012-09-30	9
2012-12-31	12
2013-03-31	11
2013-06-30	11
2013-09-30	8
2013-12-31	8
2014-03-31	203
2014-06-30	7
2014-09-30	9
2014-12-31	37
2015-03-31	19
2015-06-30	7
2015-09-30	6
2015-12-31	17
2016-03-31	9
2016-06-30	7
2016-09-30	18
2016-12-31	24
2017-03-31	10
2017-06-30	-2
2017-09-30	14
2017-12-31	20
2018-03-31	18
2018-06-30	16
2018-09-30	5
2018-12-31	27
2019-03-31	16
2019-06-30	66
2019-09-30	51
2019-12-31	54
2020-03-31	137
2020-06-30	234
2020-09-30	96
2020-12-31	41
2021-03-31	11
2021-06-30	25
2021-09-30	105
2021-12-31	-5
2022-03-31	-4
2022-06-30	17
2022-09-30	36
2022-12-31	-18
2023-03-31	-30
2023-06-30	1
2023-09-30	4