Quarter	US dollars
1999-03-31	229
1999-06-30	307
1999-09-30	236
1999-12-31	272
2000-03-31	291
2000-06-30	275
2000-09-30	227
2000-12-31	354
2001-03-31	275
2001-06-30	258
2001-09-30	189
2001-12-31	143
2002-03-31	95
2002-06-30	149
2002-09-30	156
2002-12-31	237
2003-03-31	174
2003-06-30	198
2003-09-30	191
2003-12-31	207
2004-03-31	173
2004-06-30	163
2004-09-30	240
2004-12-31	316
2005-03-31	277
2005-06-30	223
2005-09-30	194
2005-12-31	193
2006-03-31	162
2006-06-30	160
2006-09-30	147
2006-12-31	265
2007-03-31	349
2007-06-30	219
2007-09-30	187
2007-12-31	193
2008-03-31	158
2008-06-30	95
2008-09-30	120
2008-12-31	478
2009-03-31	537
2009-06-30	128
2009-09-30	190
2009-12-31	68
2010-03-31	60
2010-06-30	40
2010-09-30	30
2010-12-31	112
2011-03-31	575
2011-06-30	524
2011-09-30	467
2011-12-31	604
2012-03-31	725
2012-06-30	601
2012-09-30	645
2012-12-31	518
2013-03-31	493
2013-06-30	407
2013-09-30	480
2013-12-31	570
2014-03-31	477
2014-06-30	549
2014-09-30	548
2014-12-31	668
2015-03-31	1381
2015-06-30	1208
2015-09-30	1233
2015-12-31	1501
2016-03-31	1073
2016-06-30	1200
2016-09-30	918
2016-12-31	941
2017-03-31	606
2017-06-30	678
2017-09-30	530
2017-12-31	386
2018-03-31	144
2018-06-30	244
2018-09-30	327
2018-12-31	217
2019-03-31	91
2019-06-30	167
2019-09-30	146
2019-12-31	116
2020-03-31	143
2020-06-30	105
2020-09-30	75
2020-12-31	12
2021-03-31	16
2021-06-30	37
2021-09-30	32
2021-12-31	32
2022-03-31	105
2022-06-30	75
2022-09-30	109
2022-12-31	68
2023-03-31	57
2023-06-30	119
2023-09-30	115