Quarter	US dollars
1999-03-31	317
1999-06-30	233
1999-09-30	284
1999-12-31	218
2000-03-31	173
2000-06-30	391
2000-09-30	171
2000-12-31	137
2001-03-31	371
2001-06-30	351
2001-09-30	556
2001-12-31	841
2002-03-31	1345
2002-06-30	2018
2002-09-30	2423
2002-12-31	2918
2003-03-31	3523
2003-06-30	3916
2003-09-30	4048
2003-12-31	3887
2004-03-31	3859
2004-06-30	2791
2004-09-30	2812
2004-12-31	2572
2005-03-31	3007
2005-06-30	3045
2005-09-30	2833
2005-12-31	2282
2006-03-31	2739
2006-06-30	3257
2006-09-30	2886
2006-12-31	3340
2007-03-31	3207
2007-06-30	3748
2007-09-30	3874
2007-12-31	3247
2008-03-31	2861
2008-06-30	1505
2008-09-30	1501
2008-12-31	1204
2009-03-31	1193
2009-06-30	1378
2009-09-30	1424
2009-12-31	3153
2010-03-31	1949
2010-06-30	1896
2010-09-30	1224
2010-12-31	2395
2011-03-31	2150
2011-06-30	1436
2011-09-30	1906
2011-12-31	2046
2012-03-31	1389
2012-06-30	969
2012-09-30	667
2012-12-31	362
2013-03-31	403
2013-06-30	137
2013-09-30	45
2013-12-31	107
2014-03-31	181
2014-06-30	509
2014-09-30	953
2014-12-31	555
2015-03-31	1300
2015-06-30	1260
2015-09-30	1157
2015-12-31	1503
2016-03-31	1527
2016-06-30	1454
2016-09-30	1484
2016-12-31	1048
2017-03-31	854
2017-06-30	1677
2017-09-30	809
2017-12-31	146
2018-03-31	81
2018-06-30	123
2018-09-30	354
2018-12-31	233
2019-03-31	180
2019-06-30	249
2019-09-30	42
2019-12-31	51
2020-03-31	60
2020-06-30	53
2020-09-30	86
2020-12-31	245
2021-03-31	56
2021-06-30	312
2021-09-30	297
2021-12-31	94
2022-03-31	126
2022-06-30	70
2022-09-30	83
2022-12-31	146
2023-03-31	55
2023-06-30	54
2023-09-30	50