Quarter	US dollars
1999-03-31	15
1999-06-30	14
1999-09-30	19
1999-12-31	12
2000-03-31	11
2000-06-30	10
2000-09-30	9
2000-12-31	9
2001-03-31	8
2001-06-30	21
2001-09-30	28
2001-12-31	53
2002-03-31	89
2002-06-30	133
2002-09-30	133
2002-12-31	211
2003-03-31	188
2003-06-30	254
2003-09-30	260
2003-12-31	252
2004-03-31	243
2004-06-30	237
2004-09-30	254
2004-12-31	227
2005-03-31	225
2005-06-30	186
2005-09-30	187
2005-12-31	134
2006-03-31	127
2006-06-30	112
2006-09-30	105
2006-12-31	89
2007-03-31	90
2007-06-30	140
2007-09-30	85
2007-12-31	79
2008-03-31	108
2008-06-30	103
2008-09-30	90
2008-12-31	86
2009-03-31	87
2009-06-30	78
2009-09-30	75
2009-12-31	67
2010-03-31	136
2010-06-30	172
2010-09-30	168
2010-12-31	142
2011-03-31	139
2011-06-30	161
2011-09-30	93
2011-12-31	119
2012-03-31	83
2012-06-30	8
2012-09-30	244
2012-12-31	158
2013-03-31	179
2013-06-30	117
2013-09-30	93
2013-12-31	105
2014-03-31	103
2014-06-30	101
2014-09-30	96
2014-12-31	93
2015-03-31	59
2015-06-30	56
2015-09-30	96
2015-12-31	111
2016-03-31	102
2016-06-30	135
2016-09-30	114
2016-12-31	144
2017-03-31	81
2017-06-30	98
2017-09-30	75
2017-12-31	77
2018-03-31	94
2018-06-30	72
2018-09-30	93
2018-12-31	95
2019-03-31	104
2019-06-30	90
2019-09-30	62
2019-12-31	69
2020-03-31	74
2020-06-30	77
2020-09-30	74
2020-12-31	80
2021-03-31	68
2021-06-30	93
2021-09-30	85
2021-12-31	86
2022-03-31	80
2022-06-30	76
2022-09-30	69
2022-12-31	62
2023-03-31	70
2023-06-30	60
2023-09-30	54