Quarter	US dollars
1999-03-31	13
1999-06-30	12
1999-09-30	12
1999-12-31	10
2000-03-31	10
2000-06-30	9
2000-09-30	9
2000-12-31	8
2001-03-31	19
2001-06-30	17
2001-09-30	11
2001-12-31	10
2002-03-31	13
2002-06-30	14
2002-09-30	12
2002-12-31	8
2003-03-31	5
2003-06-30	4
2003-09-30	4
2003-12-31	11
2004-03-31	17
2004-06-30	13
2004-09-30	19
2004-12-31	30
2005-03-31	4
2005-06-30	3
2005-09-30	11
2005-12-31	33
2006-03-31	15
2006-06-30	20
2006-09-30	14
2006-12-31	118
2007-03-31	100
2007-06-30	108
2007-09-30	106
2007-12-31	312
2008-03-31	302
2008-06-30	299
2008-09-30	287
2008-12-31	255
2009-03-31	225
2009-06-30	185
2009-09-30	183
2009-12-31	147
2010-03-31	273
2010-06-30	259
2010-09-30	312
2010-12-31	321
2011-03-31	353
2011-06-30	346
2011-09-30	423
2011-12-31	371
2012-03-31	339
2012-06-30	275
2012-09-30	442
2012-12-31	435
2013-03-31	397
2013-06-30	490
2013-09-30	568
2013-12-31	572
2014-03-31	568
2014-06-30	674
2014-09-30	836
2014-12-31	963
2015-03-31	733
2015-06-30	795
2015-09-30	613
2015-12-31	510
2016-03-31	404
2016-06-30	426
2016-09-30	294
2016-12-31	360
2017-03-31	374
2017-06-30	315
2017-09-30	30
2017-12-31	32
2018-03-31	160
2018-06-30	145
2018-09-30	4
2018-12-31	4
2019-03-31	4
2019-06-30	4
2019-09-30	4
2019-12-31	0
2020-03-31	2
2020-06-30	4
2020-09-30	0
2020-12-31	2
2021-03-31	0
2021-06-30	1
2021-09-30	1
2021-12-31	2
2022-03-31	1
2022-06-30	1
2022-09-30	8
2022-12-31	11
2023-03-31	7
2023-06-30	4
2023-09-30	10