Quarter	US dollars
1999-03-31	163
1999-06-30	162
1999-09-30	187
1999-12-31	163
2000-03-31	150
2000-06-30	251
2000-09-30	248
2000-12-31	198
2001-03-31	225
2001-06-30	229
2001-09-30	187
2001-12-31	200
2002-03-31	211
2002-06-30	171
2002-09-30	117
2002-12-31	386
2003-03-31	85
2003-06-30	101
2003-09-30	121
2003-12-31	146
2004-03-31	173
2004-06-30	151
2004-09-30	153
2004-12-31	157
2005-03-31	181
2005-06-30	120
2005-09-30	133
2005-12-31	164
2006-03-31	187
2006-06-30	161
2006-09-30	114
2006-12-31	126
2007-03-31	191
2007-06-30	182
2007-09-30	136
2007-12-31	276
2008-03-31	192
2008-06-30	278
2008-09-30	257
2008-12-31	140
2009-03-31	179
2009-06-30	231
2009-09-30	298
2009-12-31	294
2010-03-31	363
2010-06-30	317
2010-09-30	335
2010-12-31	303
2011-03-31	401
2011-06-30	319
2011-09-30	314
2011-12-31	235
2012-03-31	166
2012-06-30	245
2012-09-30	250
2012-12-31	153
2013-03-31	70
2013-06-30	146
2013-09-30	266
2013-12-31	402
2014-03-31	478
2014-06-30	518
2014-09-30	561
2014-12-31	431
2015-03-31	536
2015-06-30	488
2015-09-30	506
2015-12-31	541
2016-03-31	475
2016-06-30	536
2016-09-30	340
2016-12-31	363
2017-03-31	384
2017-06-30	514
2017-09-30	474
2017-12-31	1141
2018-03-31	1060
2018-06-30	875
2018-09-30	864
2018-12-31	569
2019-03-31	704
2019-06-30	524
2019-09-30	538
2019-12-31	1059
2020-03-31	876
2020-06-30	853
2020-09-30	910
2020-12-31	808
2021-03-31	826
2021-06-30	725
2021-09-30	305
2021-12-31	330
2022-03-31	276
2022-06-30	275
2022-09-30	307
2022-12-31	255
2023-03-31	309
2023-06-30	275
2023-09-30	504