Quarter	US dollars
1999-03-31	3
1999-06-30	2
1999-09-30	14
1999-12-31	15
2000-03-31	27
2000-06-30	31
2000-09-30	28
2000-12-31	24
2001-03-31	34
2001-06-30	45
2001-09-30	41
2001-12-31	36
2002-03-31	40
2002-06-30	25
2002-09-30	30
2002-12-31	41
2003-03-31	31
2003-06-30	28
2003-09-30	28
2003-12-31	38
2004-03-31	40
2004-06-30	52
2004-09-30	60
2004-12-31	71
2005-03-31	99
2005-06-30	179
2005-09-30	208
2005-12-31	188
2006-03-31	236
2006-06-30	239
2006-09-30	247
2006-12-31	195
2007-03-31	174
2007-06-30	168
2007-09-30	194
2007-12-31	203
2008-03-31	166
2008-06-30	201
2008-09-30	217
2008-12-31	145
2009-03-31	152
2009-06-30	163
2009-09-30	187
2009-12-31	175
2010-03-31	145
2010-06-30	132
2010-09-30	154
2010-12-31	174
2011-03-31	183
2011-06-30	192
2011-09-30	162
2011-12-31	67
2012-03-31	131
2012-06-30	136
2012-09-30	79
2012-12-31	35
2013-03-31	38
2013-06-30	21
2013-09-30	40
2013-12-31	35
2014-03-31	24
2014-06-30	5
2014-09-30	14
2014-12-31	15
2015-03-31	11
2015-06-30	9
2015-09-30	17
2015-12-31	7
2016-03-31	18
2016-06-30	22
2016-09-30	22
2016-12-31	22
2017-03-31	31
2017-06-30	26
2017-09-30	32
2017-12-31	35
2018-03-31	4
2018-06-30	16
2018-09-30	50
2018-12-31	30
2019-03-31	1
2019-06-30	26
2019-09-30	25
2019-12-31	11
2020-03-31	35
2020-06-30	14
2020-09-30	28
2020-12-31	22
2021-03-31	20
2021-06-30	27
2021-09-30	15
2021-12-31	29
2022-03-31	-32
2022-06-30	-17
2022-09-30	-9
2022-12-31	-24
2023-03-31	-42
2023-06-30	-27
2023-09-30	-18