Quarter	US dollars
1999-03-31	164
1999-06-30	150
1999-09-30	250
1999-12-31	144
2000-03-31	139
2000-06-30	131
2000-09-30	161
2000-12-31	126
2001-03-31	137
2001-06-30	109
2001-09-30	112
2001-12-31	62
2002-03-31	138
2002-06-30	151
2002-09-30	208
2002-12-31	112
2003-03-31	158
2003-06-30	228
2003-09-30	184
2003-12-31	207
2004-03-31	238
2004-06-30	215
2004-09-30	245
2004-12-31	191
2005-03-31	232
2005-06-30	515
2005-09-30	478
2005-12-31	229
2006-03-31	319
2006-06-30	265
2006-09-30	244
2006-12-31	110
2007-03-31	189
2007-06-30	195
2007-09-30	255
2007-12-31	114
2008-03-31	194
2008-06-30	185
2008-09-30	262
2008-12-31	232
2009-03-31	295
2009-06-30	265
2009-09-30	249
2009-12-31	101
2010-03-31	226
2010-06-30	216
2010-09-30	287
2010-12-31	176
2011-03-31	281
2011-06-30	201
2011-09-30	205
2011-12-31	265
2012-03-31	260
2012-06-30	245
2012-09-30	265
2012-12-31	549
2013-03-31	455
2013-06-30	422
2013-09-30	542
2013-12-31	493
2014-03-31	240
2014-06-30	212
2014-09-30	258
2014-12-31	471
2015-03-31	420
2015-06-30	999
2015-09-30	1338
2015-12-31	1652
2016-03-31	815
2016-06-30	836
2016-09-30	824
2016-12-31	626
2017-03-31	623
2017-06-30	853
2017-09-30	677
2017-12-31	540
2018-03-31	451
2018-06-30	602
2018-09-30	468
2018-12-31	292
2019-03-31	380
2019-06-30	633
2019-09-30	723
2019-12-31	435
2020-03-31	489
2020-06-30	380
2020-09-30	443
2020-12-31	575
2021-03-31	327
2021-06-30	380
2021-09-30	378
2021-12-31	512
2022-03-31	733
2022-06-30	1226
2022-09-30	1379
2022-12-31	368
2023-03-31	298
2023-06-30	401
2023-09-30	319