Quarter	US dollars
1999-09-30	25
1999-12-31	24
2000-03-31	26
2000-06-30	30
2000-09-30	33
2000-12-31	33
2001-03-31	30
2001-06-30	34
2001-09-30	35
2001-12-31	39
2002-03-31	37
2002-06-30	27
2002-09-30	20
2002-12-31	18
2003-03-31	17
2003-06-30	3
2003-09-30	7
2003-12-31	13
2004-03-31	31
2004-06-30	36
2004-09-30	42
2004-12-31	42
2005-03-31	47
2005-06-30	56
2005-09-30	53
2005-12-31	51
2006-03-31	75
2006-06-30	85
2006-09-30	92
2006-12-31	86
2007-03-31	82
2007-06-30	76
2007-09-30	69
2007-12-31	68
2008-03-31	85
2008-06-30	72
2008-09-30	75
2008-12-31	59
2009-03-31	53
2009-06-30	43
2009-09-30	46
2009-12-31	42
2010-03-31	540
2010-06-30	531
2010-09-30	1571
2010-12-31	241
2011-03-31	665
2011-06-30	835
2011-09-30	707
2011-12-31	515
2012-03-31	478
2012-06-30	383
2012-09-30	182
2012-12-31	131
2013-03-31	185
2013-06-30	114
2013-09-30	133
2013-12-31	187
2014-03-31	160
2014-06-30	121
2014-09-30	125
2014-12-31	94
2015-03-31	74
2015-06-30	80
2015-09-30	98
2015-12-31	253
2016-03-31	181
2016-06-30	153
2016-09-30	203
2016-12-31	225
2017-03-31	218
2017-06-30	257
2017-09-30	231
2017-12-31	216
2018-03-31	232
2018-06-30	242
2018-09-30	205
2018-12-31	202
2019-03-31	206
2019-06-30	211
2019-09-30	184
2019-12-31	188
2020-03-31	162
2020-06-30	150
2020-09-30	142
2020-12-31	143
2021-03-31	134
2021-06-30	145
2021-09-30	135
2021-12-31	96
2022-03-31	118
2022-06-30	109
2022-09-30	102
2022-12-31	107
2023-03-31	94
2023-06-30	85
2023-09-30	94