Quarter	US dollars
1999-03-31	201
1999-06-30	462
1999-09-30	600
1999-12-31	289
2000-03-31	293
2000-06-30	347
2000-09-30	332
2000-12-31	435
2001-03-31	419
2001-06-30	451
2001-09-30	502
2001-12-31	388
2002-03-31	429
2002-06-30	469
2002-09-30	549
2002-12-31	655
2003-03-31	633
2003-06-30	673
2003-09-30	627
2003-12-31	624
2004-03-31	791
2004-06-30	819
2004-09-30	831
2004-12-31	806
2005-03-31	835
2005-06-30	721
2005-09-30	643
2005-12-31	678
2006-03-31	695
2006-06-30	682
2006-09-30	684
2006-12-31	817
2007-03-31	1090
2007-06-30	1221
2007-09-30	1275
2007-12-31	1104
2008-03-31	1431
2008-06-30	1460
2008-09-30	1413
2008-12-31	1176
2009-03-31	1127
2009-06-30	1192
2009-09-30	1309
2009-12-31	1144
2010-03-31	1103
2010-06-30	1173
2010-09-30	1654
2010-12-31	1646
2011-03-31	1709
2011-06-30	2240
2011-09-30	1823
2011-12-31	1698
2012-03-31	1806
2012-06-30	1674
2012-09-30	1851
2012-12-31	1681
2013-03-31	1755
2013-06-30	1632
2013-09-30	1741
2013-12-31	1670
2014-03-31	1765
2014-06-30	2065
2014-09-30	2071
2014-12-31	1984
2015-03-31	2088
2015-06-30	1661
2015-09-30	2076
2015-12-31	2260
2016-03-31	2187
2016-06-30	1982
2016-09-30	1899
2016-12-31	1567
2017-03-31	1435
2017-06-30	1017
2017-09-30	883
2017-12-31	692
2018-03-31	614
2018-06-30	726
2018-09-30	578
2018-12-31	525
2019-03-31	453
2019-06-30	527
2019-09-30	539
2019-12-31	477
2020-03-31	313
2020-06-30	322
2020-09-30	253
2020-12-31	94
2021-03-31	128
2021-06-30	180
2021-09-30	70
2021-12-31	58
2022-03-31	2
2022-06-30	-41
2022-09-30	16
2022-12-31	43
2023-03-31	9
2023-06-30	89
2023-09-30	138