Quarter	US dollars
1999-03-31	70
1999-06-30	63
1999-09-30	48
1999-12-31	48
2000-03-31	47
2000-06-30	58
2000-09-30	58
2000-12-31	57
2001-03-31	41
2001-06-30	40
2001-09-30	22
2001-12-31	16
2002-03-31	20
2002-06-30	21
2002-09-30	24
2002-12-31	32
2003-03-31	36
2003-06-30	35
2003-09-30	38
2003-12-31	51
2004-03-31	72
2004-06-30	78
2004-09-30	97
2004-12-31	118
2005-03-31	127
2005-06-30	130
2005-09-30	107
2005-12-31	122
2006-03-31	125
2006-06-30	128
2006-09-30	133
2006-12-31	143
2007-03-31	139
2007-06-30	139
2007-09-30	162
2007-12-31	178
2008-03-31	246
2008-06-30	292
2008-09-30	293
2008-12-31	295
2009-03-31	292
2009-06-30	322
2009-09-30	369
2009-12-31	320
2010-03-31	378
2010-06-30	529
2010-09-30	588
2010-12-31	537
2011-03-31	544
2011-06-30	549
2011-09-30	647
2011-12-31	604
2012-03-31	593
2012-06-30	554
2012-09-30	539
2012-12-31	543
2013-03-31	486
2013-06-30	423
2013-09-30	352
2013-12-31	312
2014-03-31	355
2014-06-30	356
2014-09-30	282
2014-12-31	363
2015-03-31	296
2015-06-30	335
2015-09-30	308
2015-12-31	375
2016-03-31	319
2016-06-30	393
2016-09-30	503
2016-12-31	483
2017-03-31	494
2017-06-30	417
2017-09-30	427
2017-12-31	539
2018-03-31	587
2018-06-30	586
2018-09-30	529
2018-12-31	534
2019-03-31	504
2019-06-30	555
2019-09-30	475
2019-12-31	421
2020-03-31	426
2020-06-30	355
2020-09-30	369
2020-12-31	324
2021-03-31	291
2021-06-30	367
2021-09-30	268
2021-12-31	240
2022-03-31	217
2022-06-30	221
2022-09-30	220
2022-12-31	207
2023-03-31	210
2023-06-30	200
2023-09-30	192