Quarter	US dollars
1999-03-31	36
1999-06-30	29
1999-09-30	32
1999-12-31	35
2000-03-31	29
2000-06-30	18
2000-09-30	19
2000-12-31	18
2001-03-31	15
2001-06-30	12
2001-09-30	13
2001-12-31	12
2002-03-31	13
2002-06-30	27
2002-09-30	38
2002-12-31	35
2003-03-31	34
2003-06-30	36
2003-09-30	41
2003-12-31	49
2004-03-31	52
2004-06-30	52
2004-09-30	46
2004-12-31	46
2005-03-31	46
2005-06-30	58
2005-09-30	60
2005-12-31	65
2006-03-31	55
2006-06-30	61
2006-09-30	73
2006-12-31	62
2007-03-31	91
2007-06-30	118
2007-09-30	124
2007-12-31	86
2008-03-31	95
2008-06-30	90
2008-09-30	78
2008-12-31	63
2009-03-31	58
2009-06-30	66
2009-09-30	77
2009-12-31	71
2010-03-31	70
2010-06-30	78
2010-09-30	86
2010-12-31	115
2011-03-31	111
2011-06-30	119
2011-09-30	108
2011-12-31	106
2012-03-31	113
2012-06-30	110
2012-09-30	114
2012-12-31	117
2013-03-31	128
2013-06-30	137
2013-09-30	145
2013-12-31	136
2014-03-31	201
2014-06-30	207
2014-09-30	200
2014-12-31	195
2015-03-31	198
2015-06-30	185
2015-09-30	115
2015-12-31	152
2016-03-31	151
2016-06-30	140
2016-09-30	174
2016-12-31	143
2017-03-31	156
2017-06-30	162
2017-09-30	168
2017-12-31	173
2018-03-31	170
2018-06-30	154
2018-09-30	189
2018-12-31	153
2019-03-31	156
2019-06-30	151
2019-09-30	148
2019-12-31	160
2020-03-31	152
2020-06-30	156
2020-09-30	178
2020-12-31	172
2021-03-31	203
2021-06-30	201
2021-09-30	180
2021-12-31	177
2022-03-31	163
2022-06-30	146
2022-09-30	130
2022-12-31	129
2023-03-31	129
2023-06-30	135
2023-09-30	124