Quarter	US dollars
1999-03-31	70
1999-06-30	67
1999-09-30	108
1999-12-31	61
2000-03-31	88
2000-06-30	68
2000-09-30	104
2000-12-31	119
2001-03-31	109
2001-06-30	140
2001-09-30	127
2001-12-31	185
2002-03-31	195
2002-06-30	199
2002-09-30	555
2002-12-31	694
2003-03-31	1182
2003-06-30	1367
2003-09-30	1568
2003-12-31	1668
2004-03-31	1953
2004-06-30	2016
2004-09-30	2377
2004-12-31	2276
2005-03-31	2305
2005-06-30	2215
2005-09-30	2234
2005-12-31	2366
2006-03-31	2264
2006-06-30	2139
2006-09-30	2087
2006-12-31	1950
2007-03-31	1876
2007-06-30	1871
2007-09-30	2047
2007-12-31	1823
2008-03-31	1737
2008-06-30	1458
2008-09-30	1259
2008-12-31	1058
2009-03-31	1021
2009-06-30	1072
2009-09-30	1020
2009-12-31	1024
2010-03-31	952
2010-06-30	696
2010-09-30	757
2010-12-31	727
2011-03-31	734
2011-06-30	525
2011-09-30	484
2011-12-31	431
2012-03-31	371
2012-06-30	282
2012-09-30	274
2012-12-31	255
2013-03-31	232
2013-06-30	142
2013-09-30	145
2013-12-31	128
2014-03-31	121
2014-06-30	99
2014-09-30	85
2014-12-31	80
2015-03-31	64
2015-06-30	54
2015-09-30	100
2015-12-31	44
2016-03-31	41
2016-06-30	94
2016-09-30	30
2016-12-31	14
2017-03-31	22
2017-06-30	14
2017-09-30	18
2017-12-31	78
2018-03-31	12
2018-06-30	9
2018-09-30	6
2018-12-31	36
2019-03-31	6
2019-06-30	6
2019-09-30	32
2019-12-31	6
2020-03-31	6
2020-06-30	6
2020-09-30	6
2020-12-31	6
2021-03-31	6
2021-06-30	5
2021-09-30	14
2021-12-31	24
2022-03-31	72
2022-06-30	58
2022-09-30	79
2022-12-31	57
2023-03-31	65
2023-06-30	64
2023-09-30	14