Quarter	US dollars
1999-09-30	15
1999-12-31	18
2000-03-31	11
2000-06-30	8
2000-09-30	6
2000-12-31	3
2001-03-31	0
2001-06-30	0
2001-09-30	0
2001-12-31	4
2002-03-31	4
2002-06-30	12
2002-09-30	13
2002-12-31	16
2003-03-31	14
2003-06-30	13
2003-09-30	13
2003-12-31	16
2004-03-31	13
2004-06-30	15
2004-09-30	16
2004-12-31	17
2005-03-31	21
2005-06-30	16
2005-09-30	230
2005-12-31	215
2006-03-31	284
2006-06-30	274
2006-09-30	265
2006-12-31	260
2007-03-31	265
2007-06-30	277
2007-09-30	281
2007-12-31	311
2008-03-31	304
2008-06-30	338
2008-09-30	348
2008-12-31	321
2009-03-31	304
2009-06-30	339
2009-09-30	357
2009-12-31	339
2010-03-31	282
2010-06-30	322
2010-09-30	342
2010-12-31	374
2011-03-31	391
2011-06-30	414
2011-09-30	444
2011-12-31	473
2012-03-31	433
2012-06-30	409
2012-09-30	412
2012-12-31	482
2013-03-31	516
2013-06-30	475
2013-09-30	502
2013-12-31	481
2014-03-31	479
2014-06-30	403
2014-09-30	470
2014-12-31	604
2015-03-31	549
2015-06-30	508
2015-09-30	606
2015-12-31	532
2016-03-31	523
2016-06-30	19
2016-09-30	14
2016-12-31	30
2017-03-31	46
2017-06-30	21
2017-09-30	20
2017-12-31	27
2018-03-31	156
2018-06-30	156
2018-09-30	155
2018-12-31	148
2019-03-31	162
2019-06-30	148
2019-09-30	144
2019-12-31	147
2020-03-31	150
2020-06-30	138
2020-09-30	140
2020-12-31	135
2021-03-31	189
2021-06-30	61
2021-09-30	59
2021-12-31	54
2022-03-31	50
2022-06-30	54
2022-09-30	58
2022-12-31	54
2023-03-31	53
2023-06-30	56
2023-09-30	55