Quarter	US dollars
1999-03-31	154
1999-06-30	141
1999-09-30	119
1999-12-31	223
2000-03-31	284
2000-06-30	272
2000-09-30	237
2000-12-31	221
2001-03-31	135
2001-06-30	219
2001-09-30	203
2001-12-31	188
2002-03-31	221
2002-06-30	241
2002-09-30	193
2002-12-31	176
2003-03-31	193
2003-06-30	151
2003-09-30	142
2003-12-31	145
2004-03-31	79
2004-06-30	69
2004-09-30	71
2004-12-31	82
2005-03-31	43
2005-06-30	2
2005-09-30	10
2005-12-31	18
2006-03-31	21
2006-06-30	15
2006-09-30	12
2006-12-31	25
2007-03-31	25
2007-06-30	15
2007-09-30	65
2007-12-31	52
2008-03-31	27
2008-06-30	39
2008-09-30	27
2008-12-31	152
2009-03-31	228
2009-06-30	253
2009-09-30	281
2009-12-31	268
2010-03-31	276
2010-06-30	274
2010-09-30	425
2010-12-31	334
2011-03-31	267
2011-06-30	258
2011-09-30	370
2011-12-31	236
2012-03-31	232
2012-06-30	250
2012-09-30	246
2012-12-31	265
2013-03-31	352
2013-06-30	353
2013-09-30	262
2013-12-31	289
2014-03-31	334
2014-06-30	314
2014-09-30	328
2014-12-31	223
2015-03-31	92
2015-06-30	77
2015-09-30	59
2015-12-31	97
2016-03-31	119
2016-06-30	149
2016-09-30	66
2016-12-31	67
2017-03-31	76
2017-06-30	139
2017-09-30	-6
2017-12-31	117
2018-03-31	46
2018-06-30	46
2018-09-30	40
2018-12-31	28
2019-03-31	38
2019-06-30	55
2019-09-30	86
2019-12-31	81
2020-03-31	117
2020-06-30	102
2020-09-30	109
2020-12-31	89
2021-03-31	37
2021-06-30	15
2021-09-30	58
2021-12-31	40
2022-03-31	7
2022-06-30	15
2022-09-30	23
2022-12-31	47
2023-03-31	57
2023-06-30	165
2023-09-30	149