Quarter	US dollars
1999-03-31	345
1999-06-30	281
1999-09-30	281
1999-12-31	337
2000-03-31	338
2000-06-30	293
2000-09-30	298
2000-12-31	299
2001-03-31	330
2001-06-30	323
2001-09-30	294
2001-12-31	366
2002-03-31	407
2002-06-30	346
2002-09-30	323
2002-12-31	383
2003-03-31	387
2003-06-30	334
2003-09-30	303
2003-12-31	462
2004-03-31	501
2004-06-30	446
2004-09-30	392
2004-12-31	500
2005-03-31	581
2005-06-30	437
2005-09-30	426
2005-12-31	422
2006-03-31	429
2006-06-30	456
2006-09-30	467
2006-12-31	579
2007-03-31	575
2007-06-30	479
2007-09-30	331
2007-12-31	352
2008-03-31	496
2008-06-30	400
2008-09-30	352
2008-12-31	436
2009-03-31	508
2009-06-30	452
2009-09-30	309
2009-12-31	388
2010-03-31	617
2010-06-30	502
2010-09-30	479
2010-12-31	484
2011-03-31	574
2011-06-30	381
2011-09-30	323
2011-12-31	390
2012-03-31	1236
2012-06-30	1128
2012-09-30	679
2012-12-31	960
2013-03-31	975
2013-06-30	1285
2013-09-30	816
2013-12-31	1013
2014-03-31	1152
2014-06-30	1306
2014-09-30	870
2014-12-31	1017
2015-03-31	1246
2015-06-30	950
2015-09-30	669
2015-12-31	961
2016-03-31	1496
2016-06-30	1224
2016-09-30	970
2016-12-31	1284
2017-03-31	1528
2017-06-30	1014
2017-09-30	1020
2017-12-31	1125
2018-03-31	1658
2018-06-30	1399
2018-09-30	1232
2018-12-31	1284
2019-03-31	1494
2019-06-30	1528
2019-09-30	1430
2019-12-31	1633
2020-03-31	2006
2020-06-30	1465
2020-09-30	1559
2020-12-31	1744
2021-03-31	2060
2021-06-30	1439
2021-09-30	1496
2021-12-31	1619
2022-03-31	1835
2022-06-30	1212
2022-09-30	1249
2022-12-31	1391
2023-03-31	1526
2023-06-30	1232
2023-09-30	1116