Quarter	US dollars
1999-03-31	110
1999-06-30	167
1999-09-30	155
1999-12-31	145
2000-03-31	138
2000-06-30	120
2000-09-30	112
2000-12-31	110
2001-03-31	104
2001-06-30	105
2001-09-30	109
2001-12-31	97
2002-03-31	77
2002-06-30	60
2002-09-30	59
2002-12-31	62
2003-03-31	57
2003-06-30	59
2003-09-30	56
2003-12-31	51
2004-03-31	52
2004-06-30	47
2004-09-30	62
2004-12-31	66
2005-03-31	70
2005-06-30	82
2005-09-30	99
2005-12-31	84
2006-03-31	84
2006-06-30	98
2006-09-30	163
2006-12-31	184
2007-03-31	176
2007-06-30	161
2007-09-30	196
2007-12-31	111
2008-03-31	182
2008-06-30	229
2008-09-30	220
2008-12-31	325
2009-03-31	327
2009-06-30	312
2009-09-30	171
2009-12-31	574
2010-03-31	332
2010-06-30	209
2010-09-30	195
2010-12-31	202
2011-03-31	210
2011-06-30	205
2011-09-30	208
2011-12-31	197
2012-03-31	217
2012-06-30	211
2012-09-30	227
2012-12-31	221
2013-03-31	213
2013-06-30	175
2013-09-30	177
2013-12-31	175
2014-03-31	176
2014-06-30	181
2014-09-30	179
2014-12-31	171
2015-03-31	167
2015-06-30	169
2015-09-30	169
2015-12-31	173
2016-03-31	171
2016-06-30	170
2016-09-30	167
2016-12-31	166
2017-03-31	180
2017-06-30	200
2017-09-30	212
2017-12-31	204
2018-03-31	201
2018-06-30	198
2018-09-30	198
2018-12-31	192
2019-03-31	198
2019-06-30	201
2019-09-30	193
2019-12-31	202
2020-03-31	190
2020-06-30	184
2020-09-30	202
2020-12-31	202
2021-03-31	202
2021-06-30	205
2021-09-30	211
2021-12-31	76
2022-03-31	75
2022-06-30	71
2022-09-30	58
2022-12-31	59
2023-03-31	61
2023-06-30	62
2023-09-30	60