Quarter	US dollars
1999-03-31	19
1999-06-30	16
1999-09-30	22
1999-12-31	16
2000-03-31	14
2000-06-30	13
2000-09-30	12
2000-12-31	11
2001-03-31	10
2001-06-30	23
2001-09-30	30
2001-12-31	55
2002-03-31	99
2002-06-30	141
2002-09-30	140
2002-12-31	219
2003-03-31	192
2003-06-30	257
2003-09-30	270
2003-12-31	266
2004-03-31	245
2004-06-30	239
2004-09-30	254
2004-12-31	230
2005-03-31	233
2005-06-30	187
2005-09-30	195
2005-12-31	138
2006-03-31	136
2006-06-30	117
2006-09-30	107
2006-12-31	97
2007-03-31	102
2007-06-30	160
2007-09-30	105
2007-12-31	86
2008-03-31	139
2008-06-30	112
2008-09-30	99
2008-12-31	89
2009-03-31	102
2009-06-30	94
2009-09-30	82
2009-12-31	80
2010-03-31	140
2010-06-30	181
2010-09-30	205
2010-12-31	151
2011-03-31	145
2011-06-30	198
2011-09-30	102
2011-12-31	124
2012-03-31	92
2012-06-30	37
2012-09-30	250
2012-12-31	169
2013-03-31	193
2013-06-30	144
2013-09-30	172
2013-12-31	114
2014-03-31	197
2014-06-30	115
2014-09-30	149
2014-12-31	206
2015-03-31	144
2015-06-30	169
2015-09-30	109
2015-12-31	189
2016-03-31	128
2016-06-30	145
2016-09-30	169
2016-12-31	164
2017-03-31	108
2017-06-30	128
2017-09-30	159
2017-12-31	177
2018-03-31	199
2018-06-30	136
2018-09-30	173
2018-12-31	145
2019-03-31	157
2019-06-30	168
2019-09-30	129
2019-12-31	105
2020-03-31	109
2020-06-30	96
2020-09-30	79
2020-12-31	98
2021-03-31	83
2021-06-30	117
2021-09-30	112
2021-12-31	118
2022-03-31	103
2022-06-30	114
2022-09-30	133
2022-12-31	99
2023-03-31	195
2023-06-30	106
2023-09-30	104