Quarter	US dollars
1999-03-31	97
1999-06-30	92
1999-09-30	96
1999-12-31	124
2000-03-31	187
2000-06-30	291
2000-09-30	213
2000-12-31	178
2001-03-31	175
2001-06-30	159
2001-09-30	147
2001-12-31	162
2002-03-31	242
2002-06-30	244
2002-09-30	437
2002-12-31	376
2003-03-31	509
2003-06-30	493
2003-09-30	420
2003-12-31	328
2004-03-31	430
2004-06-30	388
2004-09-30	583
2004-12-31	498
2005-03-31	671
2005-06-30	402
2005-09-30	407
2005-12-31	305
2006-03-31	431
2006-06-30	444
2006-09-30	303
2006-12-31	379
2007-03-31	602
2007-06-30	333
2007-09-30	427
2007-12-31	848
2008-03-31	716
2008-06-30	503
2008-09-30	349
2008-12-31	164
2009-03-31	219
2009-06-30	186
2009-09-30	539
2009-12-31	352
2010-03-31	439
2010-06-30	501
2010-09-30	479
2010-12-31	523
2011-03-31	751
2011-06-30	570
2011-09-30	834
2011-12-31	362
2012-03-31	714
2012-06-30	860
2012-09-30	376
2012-12-31	463
2013-03-31	296
2013-06-30	380
2013-09-30	445
2013-12-31	566
2014-03-31	611
2014-06-30	473
2014-09-30	481
2014-12-31	567
2015-03-31	362
2015-06-30	295
2015-09-30	443
2015-12-31	442
2016-03-31	327
2016-06-30	235
2016-09-30	822
2016-12-31	198
2017-03-31	122
2017-06-30	146
2017-09-30	53
2017-12-31	133
2018-03-31	70
2018-06-30	36
2018-09-30	43
2018-12-31	44
2019-03-31	39
2019-06-30	55
2019-09-30	50
2019-12-31	35
2020-03-31	77
2020-06-30	99
2020-09-30	105
2020-12-31	74
2021-03-31	59
2021-06-30	89
2021-09-30	77
2021-12-31	37
2022-03-31	72
2022-06-30	56
2022-09-30	219
2022-12-31	30
2023-03-31	30
2023-06-30	27
2023-09-30	30