Quarter	US dollars
1999-03-31	20
1999-06-30	19
1999-09-30	17
1999-12-31	16
2000-03-31	16
2000-06-30	15
2000-09-30	15
2000-12-31	18
2001-03-31	15
2001-06-30	15
2001-09-30	132
2001-12-31	80
2002-03-31	85
2002-06-30	86
2002-09-30	86
2002-12-31	166
2003-03-31	31
2003-06-30	21
2003-09-30	130
2003-12-31	235
2004-03-31	27
2004-06-30	103
2004-09-30	103
2004-12-31	414
2005-03-31	282
2005-06-30	328
2005-09-30	369
2005-12-31	377
2006-03-31	266
2006-06-30	108
2006-09-30	315
2006-12-31	243
2007-03-31	251
2007-06-30	359
2007-09-30	426
2007-12-31	421
2008-03-31	357
2008-06-30	529
2008-09-30	375
2008-12-31	297
2009-03-31	35
2009-06-30	45
2009-09-30	63
2009-12-31	31
2010-03-31	53
2010-06-30	53
2010-09-30	57
2010-12-31	165
2011-03-31	396
2011-06-30	509
2011-09-30	309
2011-12-31	75
2012-03-31	81
2012-06-30	797
2012-09-30	86
2012-12-31	62
2013-03-31	101
2013-06-30	100
2013-09-30	286
2013-12-31	225
2014-03-31	136
2014-06-30	430
2014-09-30	695
2014-12-31	491
2015-03-31	409
2015-06-30	690
2015-09-30	626
2015-12-31	381
2016-03-31	398
2016-06-30	309
2016-09-30	357
2016-12-31	216
2017-03-31	431
2017-06-30	311
2017-09-30	475
2017-12-31	230
2018-03-31	201
2018-06-30	250
2018-09-30	366
2018-12-31	325
2019-03-31	556
2019-06-30	423
2019-09-30	603
2019-12-31	245
2020-03-31	580
2020-06-30	498
2020-09-30	446
2020-12-31	313
2021-03-31	309
2021-06-30	575
2021-09-30	477
2021-12-31	508
2022-03-31	701
2022-06-30	1202
2022-09-30	964
2022-12-31	685
2023-03-31	698
2023-06-30	369
2023-09-30	361