Quarter	US dollars
1999-03-31	41
1999-06-30	37
1999-09-30	29
1999-12-31	24
2000-03-31	28
2000-06-30	27
2000-09-30	35
2000-12-31	21
2001-03-31	19
2001-06-30	17
2001-09-30	30
2001-12-31	19
2002-03-31	20
2002-06-30	51
2002-09-30	34
2002-12-31	53
2003-03-31	76
2003-06-30	84
2003-09-30	121
2003-12-31	120
2004-03-31	125
2004-06-30	146
2004-09-30	159
2004-12-31	183
2005-03-31	234
2005-06-30	216
2005-09-30	210
2005-12-31	230
2006-03-31	273
2006-06-30	278
2006-09-30	283
2006-12-31	406
2007-03-31	805
2007-06-30	798
2007-09-30	769
2007-12-31	1095
2008-03-31	1057
2008-06-30	970
2008-09-30	856
2008-12-31	386
2009-03-31	493
2009-06-30	474
2009-09-30	409
2009-12-31	350
2010-03-31	315
2010-06-30	364
2010-09-30	255
2010-12-31	290
2011-03-31	226
2011-06-30	173
2011-09-30	151
2011-12-31	137
2012-03-31	147
2012-06-30	138
2012-09-30	161
2012-12-31	146
2013-03-31	145
2013-06-30	124
2013-09-30	99
2013-12-31	77
2014-03-31	63
2014-06-30	70
2014-09-30	68
2014-12-31	106
2015-03-31	93
2015-06-30	75
2015-09-30	96
2015-12-31	83
2016-03-31	38
2016-06-30	66
2016-09-30	62
2016-12-31	40
2017-03-31	45
2017-06-30	68
2017-09-30	77
2017-12-31	36
2018-03-31	60
2018-06-30	68
2018-09-30	23
2018-12-31	70
2019-03-31	17
2019-06-30	35
2019-09-30	86
2019-12-31	62
2020-03-31	47
2020-06-30	70
2020-09-30	30
2020-12-31	76
2021-03-31	38
2021-06-30	89
2021-09-30	20
2021-12-31	41
2022-03-31	63
2022-06-30	64
2022-09-30	117
2022-12-31	67
2023-03-31	95
2023-06-30	114
2023-09-30	134