Quarter	US dollars
1999-03-31	91
1999-06-30	58
1999-09-30	130
1999-12-31	200
2000-03-31	120
2000-06-30	193
2000-09-30	96
2000-12-31	93
2001-03-31	129
2001-06-30	184
2001-09-30	314
2001-12-31	288
2002-03-31	273
2002-06-30	316
2002-09-30	890
2002-12-31	248
2003-03-31	550
2003-06-30	545
2003-09-30	331
2003-12-31	355
2004-03-31	803
2004-06-30	1353
2004-09-30	629
2004-12-31	688
2005-03-31	1274
2005-06-30	692
2005-09-30	587
2005-12-31	655
2006-03-31	1166
2006-06-30	1081
2006-09-30	1411
2006-12-31	1089
2007-03-31	2446
2007-06-30	1247
2007-09-30	1066
2007-12-31	2096
2008-03-31	1655
2008-06-30	2364
2008-09-30	2458
2008-12-31	2221
2009-03-31	3077
2009-06-30	2429
2009-09-30	1810
2009-12-31	1378
2010-03-31	1423
2010-06-30	1978
2010-09-30	2094
2010-12-31	3019
2011-03-31	1670
2011-06-30	2582
2011-09-30	4051
2011-12-31	4136
2012-03-31	4737
2012-06-30	2979
2012-09-30	3590
2012-12-31	3298
2013-03-31	7105
2013-06-30	3964
2013-09-30	5562
2013-12-31	6334
2014-03-31	5493
2014-06-30	4393
2014-09-30	4193
2014-12-31	3317
2015-03-31	3335
2015-06-30	2901
2015-09-30	4902
2015-12-31	2337
2016-03-31	3060
2016-06-30	3421
2016-09-30	4092
2016-12-31	4494
2017-03-31	5399
2017-06-30	4914
2017-09-30	5913
2017-12-31	5107
2018-03-31	4705
2018-06-30	4075
2018-09-30	3439
2018-12-31	5512
2019-03-31	6054
2019-06-30	5725
2019-09-30	6233
2019-12-31	6566
2020-03-31	5562
2020-06-30	5021
2020-09-30	4092
2020-12-31	3798
2021-03-31	3982
2021-06-30	4321
2021-09-30	6681
2021-12-31	2472
2022-03-31	2152
2022-06-30	2617
2022-09-30	2369
2022-12-31	1855
2023-03-31	2047
2023-06-30	1499
2023-09-30	3073