Quarter	US dollars
1999-03-31	118
1999-06-30	115
1999-09-30	110
1999-12-31	119
2000-03-31	103
2000-06-30	123
2000-09-30	152
2000-12-31	164
2001-03-31	153
2001-06-30	146
2001-09-30	151
2001-12-31	149
2002-03-31	140
2002-06-30	180
2002-09-30	135
2002-12-31	156
2003-03-31	146
2003-06-30	164
2003-09-30	158
2003-12-31	160
2004-03-31	122
2004-06-30	102
2004-09-30	265
2004-12-31	219
2005-03-31	218
2005-06-30	206
2005-09-30	189
2005-12-31	180
2006-03-31	157
2006-06-30	225
2006-09-30	525
2006-12-31	260
2007-03-31	368
2007-06-30	374
2007-09-30	229
2007-12-31	206
2008-03-31	210
2008-06-30	198
2008-09-30	176
2008-12-31	165
2009-03-31	142
2009-06-30	148
2009-09-30	130
2009-12-31	112
2010-03-31	77
2010-06-30	73
2010-09-30	69
2010-12-31	61
2011-03-31	51
2011-06-30	46
2011-09-30	43
2011-12-31	36
2012-03-31	43
2012-06-30	40
2012-09-30	74
2012-12-31	75
2013-03-31	43
2013-06-30	41
2013-09-30	37
2013-12-31	40
2014-03-31	36
2014-06-30	37
2014-09-30	34
2014-12-31	31
2015-03-31	31
2015-06-30	16
2015-09-30	38
2015-12-31	32
2016-03-31	33
2016-06-30	43
2016-09-30	119
2016-12-31	139
2017-03-31	143
2017-06-30	147
2017-09-30	136
2017-12-31	138
2018-03-31	169
2018-06-30	140
2018-09-30	127
2018-12-31	140
2019-03-31	134
2019-06-30	205
2019-09-30	167
2019-12-31	172
2020-03-31	160
2020-06-30	129
2020-09-30	132
2020-12-31	137
2021-03-31	99
2021-06-30	117
2021-09-30	109
2021-12-31	95
2022-03-31	102
2022-06-30	95
2022-09-30	94
2022-12-31	85
2023-03-31	80
2023-06-30	76
2023-09-30	65