Quarter	US dollars
1997-09-30	1
1997-12-31	3
1998-03-31	2
1998-06-30	1
1998-09-30	34
1998-12-31	0
1999-03-31	133
1999-06-30	4
1999-09-30	5
1999-12-31	73
2000-03-31	73
2000-06-30	4
2000-09-30	4
2000-12-31	4
2001-03-31	4
2001-06-30	86
2001-09-30	127
2001-12-31	54
2002-03-31	509
2002-06-30	533
2002-09-30	1
2002-12-31	1
2003-03-31	1
2003-06-30	31
2003-09-30	35
2003-12-31	70
2004-03-31	219
2004-06-30	529
2004-09-30	1012
2004-12-31	1298
2005-03-31	1276
2005-06-30	1670
2005-09-30	1418
2005-12-31	1189
2006-03-31	1243
2006-06-30	935
2006-09-30	784
2006-12-31	822
2007-03-31	922
2007-06-30	1185
2007-09-30	1511
2007-12-31	1412
2008-03-31	445
2008-06-30	310
2008-09-30	4
2008-12-31	11
2009-03-31	2
2009-06-30	2
2009-09-30	3
2009-12-31	6
2010-03-31	6
2010-06-30	7
2010-09-30	5
2010-12-31	4
2011-03-31	6
2011-06-30	2
2011-09-30	6
2011-12-31	6
2012-03-31	8
2012-06-30	10
2012-09-30	9
2012-12-31	7
2013-03-31	11
2013-06-30	11
2013-09-30	7
2013-12-31	4
2014-03-31	35
2014-06-30	3527
2014-09-30	485
2014-12-31	503
2015-03-31	1577
2015-06-30	796
2015-09-30	1738
2015-12-31	804
2016-03-31	367
2016-06-30	2
2016-09-30	388
2016-12-31	4293
2017-03-31	3038
2017-06-30	3119
2017-09-30	984
2017-12-31	3423
2018-03-31	1379
2018-06-30	1187
2018-09-30	1243
2018-12-31	332
2019-03-31	3588
2019-06-30	3244
2019-09-30	2058
2019-12-31	2395
2020-03-31	312
2020-06-30	4053
2020-09-30	9529
2020-12-31	12218
2021-03-31	8182
2021-06-30	11728
2021-09-30	10695
2021-12-31	14170
2022-03-31	5574
2022-06-30	1649
2022-09-30	1760
2022-12-31	2317
2023-03-31	2520
2023-06-30	3259
2023-09-30	769
2023-12-31	2234