Quarter	US dollars
1999-03-31	17
1999-06-30	19
1999-09-30	26
1999-12-31	14
2000-03-31	29
2000-06-30	11
2000-09-30	13
2000-12-31	11
2001-03-31	9
2001-06-30	18
2001-09-30	15
2001-12-31	15
2002-03-31	14
2002-06-30	17
2002-09-30	18
2002-12-31	18
2003-03-31	11
2003-06-30	10
2003-09-30	90
2003-12-31	13
2004-03-31	11
2004-06-30	13
2004-09-30	11
2004-12-31	13
2005-03-31	14
2005-06-30	13
2005-09-30	13
2005-12-31	14
2006-03-31	14
2006-06-30	17
2006-09-30	21
2006-12-31	25
2007-03-31	28
2007-06-30	22
2007-09-30	50
2007-12-31	36
2008-03-31	34
2008-06-30	69
2008-09-30	84
2008-12-31	73
2009-03-31	94
2009-06-30	98
2009-09-30	30
2009-12-31	35
2010-03-31	33
2010-06-30	23
2010-09-30	34
2010-12-31	25
2011-03-31	26
2011-06-30	32
2011-09-30	34
2011-12-31	75
2012-03-31	75
2012-06-30	91
2012-09-30	112
2012-12-31	143
2013-03-31	145
2013-06-30	118
2013-09-30	126
2013-12-31	65
2014-03-31	59
2014-06-30	151
2014-09-30	166
2014-12-31	59
2015-03-31	58
2015-06-30	39
2015-09-30	35
2015-12-31	54
2016-03-31	48
2016-06-30	40
2016-09-30	49
2016-12-31	43
2017-03-31	60
2017-06-30	192
2017-09-30	183
2017-12-31	179
2018-03-31	312
2018-06-30	296
2018-09-30	236
2018-12-31	218
2019-03-31	197
2019-06-30	191
2019-09-30	154
2019-12-31	189
2020-03-31	161
2020-06-30	243
2020-09-30	255
2020-12-31	242
2021-03-31	221
2021-06-30	294
2021-09-30	351
2021-12-31	339
2022-03-31	349
2022-06-30	522
2022-09-30	676
2022-12-31	629
2023-03-31	513
2023-06-30	827
2023-09-30	855