Quarter	US dollars
1999-03-31	184
1999-06-30	288
1999-09-30	296
1999-12-31	283
2000-03-31	242
2000-06-30	188
2000-09-30	139
2000-12-31	135
2001-03-31	133
2001-06-30	133
2001-09-30	188
2001-12-31	169
2002-03-31	233
2002-06-30	228
2002-09-30	378
2002-12-31	544
2003-03-31	567
2003-06-30	656
2003-09-30	845
2003-12-31	828
2004-03-31	514
2004-06-30	483
2004-09-30	523
2004-12-31	556
2005-03-31	519
2005-06-30	483
2005-09-30	503
2005-12-31	531
2006-03-31	549
2006-06-30	870
2006-09-30	434
2006-12-31	634
2007-03-31	571
2007-06-30	418
2007-09-30	435
2007-12-31	481
2008-03-31	540
2008-06-30	583
2008-09-30	456
2008-12-31	488
2009-03-31	400
2009-06-30	345
2009-09-30	423
2009-12-31	339
2010-03-31	296
2010-06-30	193
2010-09-30	65
2010-12-31	94
2011-03-31	105
2011-06-30	135
2011-09-30	94
2011-12-31	83
2012-03-31	64
2012-06-30	76
2012-09-30	53
2012-12-31	251
2013-03-31	110
2013-06-30	55
2013-09-30	73
2013-12-31	71
2014-03-31	113
2014-06-30	62
2014-09-30	59
2014-12-31	79
2015-03-31	53
2015-06-30	54
2015-09-30	103
2015-12-31	433
2016-03-31	651
2016-06-30	207
2016-09-30	671
2016-12-31	589
2017-03-31	1035
2017-06-30	468
2017-09-30	776
2017-12-31	658
2018-03-31	858
2018-06-30	482
2018-09-30	808
2018-12-31	532
2019-03-31	962
2019-06-30	875
2019-09-30	606
2019-12-31	451
2020-03-31	73
2020-06-30	28
2020-09-30	981
2020-12-31	37
2021-03-31	31
2021-06-30	53
2021-09-30	57
2021-12-31	44
2022-03-31	36
2022-06-30	31
2022-09-30	42
2022-12-31	52
2023-03-31	3
2023-06-30	46
2023-09-30	42