Quarter	US dollars
1999-03-31	118
1999-06-30	40
1999-09-30	17
1999-12-31	20
2000-03-31	74
2000-06-30	21
2000-09-30	38
2000-12-31	38
2001-03-31	58
2001-06-30	57
2001-09-30	75
2001-12-31	84
2002-03-31	95
2002-06-30	94
2002-09-30	84
2002-12-31	156
2003-03-31	88
2003-06-30	132
2003-09-30	230
2003-12-31	195
2004-03-31	295
2004-06-30	518
2004-09-30	676
2004-12-31	1065
2005-03-31	1482
2005-06-30	1588
2005-09-30	2197
2005-12-31	3810
2006-03-31	3988
2006-06-30	3828
2006-09-30	4403
2006-12-31	5659
2007-03-31	5928
2007-06-30	7402
2007-09-30	7838
2007-12-31	9289
2008-03-31	8876
2008-06-30	8771
2008-09-30	7894
2008-12-31	6394
2009-03-31	5797
2009-06-30	5823
2009-09-30	5750
2009-12-31	4977
2010-03-31	4703
2010-06-30	4687
2010-09-30	5019
2010-12-31	5035
2011-03-31	5288
2011-06-30	4477
2011-09-30	3307
2011-12-31	2833
2012-03-31	2882
2012-06-30	2482
2012-09-30	2393
2012-12-31	2212
2013-03-31	2417
2013-06-30	2020
2013-09-30	1818
2013-12-31	1730
2014-03-31	1592
2014-06-30	1368
2014-09-30	943
2014-12-31	728
2015-03-31	473
2015-06-30	327
2015-09-30	480
2015-12-31	362
2016-03-31	438
2016-06-30	436
2016-09-30	371
2016-12-31	170
2017-03-31	389
2017-06-30	584
2017-09-30	833
2017-12-31	513
2018-03-31	553
2018-06-30	527
2018-09-30	737
2018-12-31	651
2019-03-31	509
2019-06-30	594
2019-09-30	850
2019-12-31	1353
2020-03-31	947
2020-06-30	873
2020-09-30	1130
2020-12-31	1212
2021-03-31	1053
2021-06-30	1098
2021-09-30	1078
2021-12-31	723
2022-03-31	632
2022-06-30	608
2022-09-30	675
2022-12-31	534
2023-03-31	556
2023-06-30	559
2023-09-30	608