Quarter	US dollars
1999-03-31	44
1999-06-30	35
1999-09-30	45
1999-12-31	61
2000-03-31	40
2000-06-30	39
2000-09-30	33
2000-12-31	31
2001-03-31	41
2001-06-30	40
2001-09-30	46
2001-12-31	38
2002-03-31	37
2002-06-30	57
2002-09-30	61
2002-12-31	57
2003-03-31	50
2003-06-30	49
2003-09-30	89
2003-12-31	66
2004-03-31	70
2004-06-30	82
2004-09-30	109
2004-12-31	60
2005-03-31	101
2005-06-30	78
2005-09-30	96
2005-12-31	92
2006-03-31	104
2006-06-30	123
2006-09-30	130
2006-12-31	103
2007-03-31	166
2007-06-30	133
2007-09-30	119
2007-12-31	114
2008-03-31	148
2008-06-30	154
2008-09-30	133
2008-12-31	130
2009-03-31	196
2009-06-30	184
2009-09-30	161
2009-12-31	138
2010-03-31	221
2010-06-30	216
2010-09-30	260
2010-12-31	191
2011-03-31	194
2011-06-30	203
2011-09-30	181
2011-12-31	154
2012-03-31	171
2012-06-30	144
2012-09-30	161
2012-12-31	301
2013-03-31	444
2013-06-30	428
2013-09-30	459
2013-12-31	506
2014-03-31	420
2014-06-30	345
2014-09-30	380
2014-12-31	428
2015-03-31	355
2015-06-30	355
2015-09-30	349
2015-12-31	321
2016-03-31	323
2016-06-30	327
2016-09-30	357
2016-12-31	344
2017-03-31	353
2017-06-30	393
2017-09-30	383
2017-12-31	349
2018-03-31	362
2018-06-30	358
2018-09-30	336
2018-12-31	331
2019-03-31	219
2019-06-30	229
2019-09-30	199
2019-12-31	214
2020-03-31	180
2020-06-30	140
2020-09-30	129
2020-12-31	141
2021-03-31	123
2021-06-30	169
2021-09-30	157
2021-12-31	149
2022-03-31	171
2022-06-30	196
2022-09-30	143
2022-12-31	159
2023-03-31	181
2023-06-30	167
2023-09-30	126