Quarter	US dollars
1999-03-31	291
1999-06-30	402
1999-09-30	472
1999-12-31	302
2000-03-31	544
2000-06-30	181
2000-09-30	165
2000-12-31	84
2001-03-31	76
2001-06-30	79
2001-09-30	116
2001-12-31	19
2002-03-31	55
2002-06-30	12
2002-09-30	26
2002-12-31	5
2003-03-31	5
2003-06-30	60
2003-09-30	88
2003-12-31	341
2004-03-31	284
2004-06-30	122
2004-09-30	131
2004-12-31	64
2005-03-31	423
2005-06-30	413
2005-09-30	307
2005-12-31	246
2006-03-31	149
2006-06-30	140
2006-09-30	149
2006-12-31	277
2007-03-31	435
2007-06-30	142
2007-09-30	239
2007-12-31	155
2008-03-31	235
2008-06-30	210
2008-09-30	420
2008-12-31	707
2009-03-31	190
2009-06-30	234
2009-09-30	1331
2009-12-31	140
2010-03-31	338
2010-06-30	453
2010-09-30	415
2010-12-31	300
2011-03-31	343
2011-06-30	562
2011-09-30	3072
2011-12-31	615
2012-03-31	566
2012-06-30	529
2012-09-30	398
2012-12-31	363
2013-03-31	594
2013-06-30	589
2013-09-30	686
2013-12-31	251
2014-03-31	361
2014-06-30	341
2014-09-30	295
2014-12-31	247
2015-03-31	206
2015-06-30	269
2015-09-30	6
2015-12-31	94
2016-03-31	77
2016-06-30	42
2016-09-30	23
2016-12-31	24
2017-03-31	44
2017-06-30	113
2017-09-30	667
2017-12-31	1262
2018-03-31	1894
2018-06-30	1937
2018-09-30	1450
2018-12-31	1506
2019-03-31	1163
2019-06-30	1552
2019-09-30	1102
2019-12-31	457
2020-03-31	233
2020-06-30	414
2020-09-30	481
2020-12-31	12
2021-03-31	10
2021-06-30	6
2021-09-30	8
2021-12-31	15
2022-03-31	6
2022-06-30	73
2022-09-30	433
2022-12-31	272
2023-03-31	415
2023-06-30	402
2023-09-30	422