Quarter	US dollars
1999-03-31	282
1999-06-30	254
1999-09-30	238
1999-12-31	249
2000-03-31	162
2000-06-30	226
2000-09-30	199
2000-12-31	262
2001-03-31	68
2001-06-30	131
2001-09-30	159
2001-12-31	163
2002-03-31	127
2002-06-30	218
2002-09-30	177
2002-12-31	151
2003-03-31	204
2003-06-30	274
2003-09-30	232
2003-12-31	379
2004-03-31	393
2004-06-30	681
2004-09-30	581
2004-12-31	587
2005-03-31	490
2005-06-30	742
2005-09-30	529
2005-12-31	1594
2006-03-31	1712
2006-06-30	1793
2006-09-30	2115
2006-12-31	2318
2007-03-31	2798
2007-06-30	3145
2007-09-30	3755
2007-12-31	4048
2008-03-31	4515
2008-06-30	4563
2008-09-30	5115
2008-12-31	4925
2009-03-31	5015
2009-06-30	4901
2009-09-30	4837
2009-12-31	4805
2010-03-31	4838
2010-06-30	4677
2010-09-30	3876
2010-12-31	4179
2011-03-31	4356
2011-06-30	4776
2011-09-30	4809
2011-12-31	4879
2012-03-31	4998
2012-06-30	5013
2012-09-30	4824
2012-12-31	4776
2013-03-31	4485
2013-06-30	4098
2013-09-30	3676
2013-12-31	3694
2014-03-31	3946
2014-06-30	3182
2014-09-30	2996
2014-12-31	3013
2015-03-31	3037
2015-06-30	4590
2015-09-30	23
2015-12-31	19
2016-03-31	20
2016-06-30	10
2016-09-30	9
2016-12-31	67
2017-03-31	36
2017-06-30	39
2017-09-30	45
2017-12-31	28
2018-03-31	28
2018-06-30	-2
2018-09-30	5
2018-12-31	102
2019-03-31	101
2019-06-30	75
2019-09-30	46
2019-12-31	22
2020-03-31	7
2020-06-30	6
2020-09-30	7
2020-12-31	6
2021-03-31	6
2021-06-30	7
2021-09-30	41
2021-12-31	35
2022-03-31	35
2022-06-30	23
2022-09-30	24
2022-12-31	27
2023-03-31	25
2023-06-30	4
2023-09-30	4