Quarter	US dollars
1986-09-30	0
1986-12-31	0
1987-03-31	0
1987-06-30	0
1987-09-30	0
1987-12-31	0
1988-03-31	0
1988-06-30	0
1988-09-30	2
1988-12-31	0
1989-03-31	12
1989-06-30	10
1989-09-30	36
1989-12-31	40
1990-03-31	62
1990-06-30	56
1990-09-30	148
1990-12-31	171
1991-03-31	5
1991-06-30	5
1991-09-30	5
1991-12-31	0
1992-03-31	0
1992-06-30	1
1992-09-30	1
1992-12-31	0
1993-03-31	0
1993-06-30	0
1993-09-30	0
1993-12-31	0
1994-03-31	0
1994-06-30	0
1994-09-30	0
1994-12-31	0
1995-03-31	0
1995-06-30	3
1995-09-30	5
1995-12-31	4
1996-03-31	4
1996-06-30	6
1996-09-30	1
1996-12-31	1
1997-03-31	1
1997-06-30	1
1997-09-30	0
1997-12-31	1
1998-03-31	1
1998-06-30	0
1998-09-30	0
1998-12-31	8
1999-03-31	2
1999-06-30	2
1999-09-30	1
1999-12-31	1
2000-03-31	0
2000-06-30	0
2000-09-30	0
2000-12-31	0
2001-03-31	0
2001-06-30	8
2001-09-30	7
2001-12-31	7
2002-03-31	44
2002-06-30	7
2002-09-30	9
2002-12-31	9
2003-03-31	9
2003-06-30	1
2003-09-30	1
2003-12-31	1
2004-03-31	1
2004-06-30	14
2004-09-30	14
2004-12-31	15
2005-03-31	16
2005-06-30	16
2005-09-30	26
2005-12-31	29
2006-03-31	22
2006-06-30	24
2006-09-30	32
2006-12-31	27
2007-03-31	22
2007-06-30	37
2007-09-30	121
2007-12-31	142
2008-03-31	71
2008-06-30	196
2008-09-30	224
2008-12-31	501
2009-03-31	315
2009-06-30	444
2009-09-30	555
2009-12-31	548
2010-03-31	530
2010-06-30	506
2010-09-30	556
2010-12-31	344
2011-03-31	362
2011-06-30	355
2011-09-30	312
2011-12-31	319
2012-03-31	342
2012-06-30	321
2012-09-30	300
2012-12-31	310
2013-03-31	294
2013-06-30	325
2013-09-30	388
2013-12-31	442
2014-03-31	467
2014-06-30	471
2014-09-30	426
2014-12-31	411
2015-03-31	384
2015-06-30	367
2015-09-30	361
2015-12-31	320
2016-03-31	328
2016-06-30	297
2016-09-30	339
2016-12-31	323
2017-03-31	331
2017-06-30	324
2017-09-30	272
2017-12-31	277
2018-03-31	273
2018-06-30	188
2018-09-30	179
2018-12-31	179
2019-03-31	177
2019-06-30	172
2019-09-30	129
2019-12-31	133
2020-03-31	130
2020-06-30	108
2020-09-30	123
2020-12-31	59
2021-03-31	51
2021-06-30	27
2021-09-30	39
2021-12-31	1
2022-03-31	13
2022-06-30	1
2022-09-30	2
2022-12-31	7
2023-03-31	8
2023-06-30	24
2023-09-30	16