Quarter	US dollars
1999-03-31	83
1999-06-30	38
1999-09-30	33
1999-12-31	18
2000-03-31	28
2000-06-30	29
2000-09-30	31
2000-12-31	48
2001-03-31	14
2001-06-30	11
2001-09-30	72
2001-12-31	2
2002-03-31	13
2002-06-30	8
2002-09-30	13
2002-12-31	19
2003-03-31	102
2003-06-30	35
2003-09-30	22
2003-12-31	35
2004-03-31	46
2004-06-30	77
2004-09-30	92
2004-12-31	163
2005-03-31	145
2005-06-30	281
2005-09-30	313
2005-12-31	410
2006-03-31	463
2006-06-30	812
2006-09-30	870
2006-12-31	921
2007-03-31	1468
2007-06-30	1850
2007-09-30	2127
2007-12-31	2416
2008-03-31	2775
2008-06-30	3135
2008-09-30	3045
2008-12-31	3266
2009-03-31	3177
2009-06-30	3017
2009-09-30	2997
2009-12-31	2843
2010-03-31	2720
2010-06-30	2407
2010-09-30	2523
2010-12-31	2584
2011-03-31	2666
2011-06-30	2598
2011-09-30	2304
2011-12-31	2373
2012-03-31	2236
2012-06-30	2114
2012-09-30	2146
2012-12-31	2613
2013-03-31	2247
2013-06-30	2018
2013-09-30	2128
2013-12-31	2368
2014-03-31	2021
2014-06-30	2461
2014-09-30	2512
2014-12-31	2412
2015-03-31	2540
2015-06-30	2207
2015-09-30	1859
2015-12-31	1838
2016-03-31	1807
2016-06-30	1820
2016-09-30	1922
2016-12-31	1523
2017-03-31	1319
2017-06-30	1311
2017-09-30	1340
2017-12-31	1095
2018-03-31	1264
2018-06-30	218
2018-09-30	128
2018-12-31	166
2019-03-31	62
2019-06-30	136
2019-09-30	94
2019-12-31	87
2020-03-31	133
2020-06-30	72
2020-09-30	226
2020-12-31	54
2021-03-31	67
2021-06-30	118
2021-09-30	32
2021-12-31	60
2022-03-31	203
2022-06-30	79
2022-09-30	111
2022-12-31	96
2023-03-31	110
2023-06-30	62
2023-09-30	124