Quarter	US dollars
1999-03-31	455
1999-06-30	439
1999-09-30	521
1999-12-31	489
2000-03-31	412
2000-06-30	331
2000-09-30	365
2000-12-31	291
2001-03-31	371
2001-06-30	340
2001-09-30	478
2001-12-31	465
2002-03-31	418
2002-06-30	487
2002-09-30	320
2002-12-31	268
2003-03-31	207
2003-06-30	251
2003-09-30	282
2003-12-31	518
2004-03-31	380
2004-06-30	341
2004-09-30	511
2004-12-31	645
2005-03-31	585
2005-06-30	555
2005-09-30	509
2005-12-31	1515
2006-03-31	1641
2006-06-30	1222
2006-09-30	1381
2006-12-31	1253
2007-03-31	1691
2007-06-30	1385
2007-09-30	1612
2007-12-31	1220
2008-03-31	1154
2008-06-30	1342
2008-09-30	1454
2008-12-31	1364
2009-03-31	1366
2009-06-30	1345
2009-09-30	1417
2009-12-31	1335
2010-03-31	1437
2010-06-30	1531
2010-09-30	1450
2010-12-31	1408
2011-03-31	1219
2011-06-30	1924
2011-09-30	1690
2011-12-31	1434
2012-03-31	2020
2012-06-30	2906
2012-09-30	2117
2012-12-31	1423
2013-03-31	1297
2013-06-30	2161
2013-09-30	2875
2013-12-31	1328
2014-03-31	1742
2014-06-30	2587
2014-09-30	1504
2014-12-31	1928
2015-03-31	1952
2015-06-30	2201
2015-09-30	2389
2015-12-31	2173
2016-03-31	1510
2016-06-30	1470
2016-09-30	1588
2016-12-31	1496
2017-03-31	1036
2017-06-30	848
2017-09-30	818
2017-12-31	666
2018-03-31	848
2018-06-30	789
2018-09-30	581
2018-12-31	594
2019-03-31	688
2019-06-30	812
2019-09-30	807
2019-12-31	907
2020-03-31	800
2020-06-30	679
2020-09-30	657
2020-12-31	590
2021-03-31	985
2021-06-30	1138
2021-09-30	616
2021-12-31	654
2022-03-31	528
2022-06-30	579
2022-09-30	765
2022-12-31	859
2023-03-31	980
2023-06-30	801
2023-09-30	853