Quarter	US dollars
1999-03-31	25
1999-06-30	15
1999-09-30	23
1999-12-31	22
2000-03-31	22
2000-06-30	25
2000-09-30	13
2000-12-31	12
2001-03-31	12
2001-06-30	11
2001-09-30	10
2001-12-31	10
2002-03-31	9
2002-06-30	9
2002-09-30	10
2002-12-31	9
2003-03-31	8
2003-06-30	11
2003-09-30	26
2003-12-31	20
2004-03-31	21
2004-06-30	21
2004-09-30	28
2004-12-31	33
2005-03-31	24
2005-06-30	23
2005-09-30	24
2005-12-31	23
2006-03-31	106
2006-06-30	122
2006-09-30	133
2006-12-31	173
2007-03-31	195
2007-06-30	306
2007-09-30	307
2007-12-31	320
2008-03-31	470
2008-06-30	349
2008-09-30	370
2008-12-31	387
2009-03-31	331
2009-06-30	313
2009-09-30	324
2009-12-31	399
2010-03-31	391
2010-06-30	431
2010-09-30	456
2010-12-31	559
2011-03-31	328
2011-06-30	350
2011-09-30	375
2011-12-31	389
2012-03-31	480
2012-06-30	477
2012-09-30	656
2012-12-31	696
2013-03-31	731
2013-06-30	682
2013-09-30	835
2013-12-31	766
2014-03-31	775
2014-06-30	706
2014-09-30	606
2014-12-31	562
2015-03-31	469
2015-06-30	433
2015-09-30	0
2015-12-31	0
2016-03-31	0
2016-06-30	0
2016-09-30	0
2016-12-31	0
2017-03-31	0
2017-06-30	0
2017-09-30	0
2017-12-31	0
2018-03-31	0
2018-06-30	0
2018-09-30	0
2018-12-31	0
2019-03-31	0
2019-06-30	0
2019-09-30	0
2019-12-31	0
2020-03-31	0
2020-06-30	0
2020-09-30	0
2020-12-31	0
2021-03-31	0
2021-06-30	0
2021-09-30	0
2021-12-31	0
2022-03-31	0
2022-06-30	0
2022-09-30	0
2022-12-31	0
2023-03-31	0
2023-06-30	0
2023-09-30	0