Quarter	US dollars
1999-03-31	75
1999-06-30	74
1999-09-30	75
1999-12-31	71
2000-03-31	70
2000-06-30	58
2000-09-30	55
2000-12-31	57
2001-03-31	53
2001-06-30	53
2001-09-30	55
2001-12-31	55
2002-03-31	53
2002-06-30	69
2002-09-30	72
2002-12-31	89
2003-03-31	72
2003-06-30	74
2003-09-30	87
2003-12-31	81
2004-03-31	82
2004-06-30	83
2004-09-30	80
2004-12-31	84
2005-03-31	87
2005-06-30	80
2005-09-30	78
2005-12-31	77
2006-03-31	66
2006-06-30	169
2006-09-30	70
2006-12-31	80
2007-03-31	79
2007-06-30	80
2007-09-30	83
2007-12-31	236
2008-03-31	314
2008-06-30	321
2008-09-30	233
2008-12-31	264
2009-03-31	242
2009-06-30	132
2009-09-30	149
2009-12-31	201
2010-03-31	279
2010-06-30	300
2010-09-30	209
2010-12-31	172
2011-03-31	212
2011-06-30	229
2011-09-30	207
2011-12-31	159
2012-03-31	152
2012-06-30	151
2012-09-30	150
2012-12-31	148
2013-03-31	137
2013-06-30	131
2013-09-30	162
2013-12-31	134
2014-03-31	106
2014-06-30	137
2014-09-30	128
2014-12-31	121
2015-03-31	98
2015-06-30	102
2015-09-30	103
2015-12-31	143
2016-03-31	100
2016-06-30	94
2016-09-30	129
2016-12-31	124
2017-03-31	128
2017-06-30	90
2017-09-30	93
2017-12-31	104
2018-03-31	95
2018-06-30	96
2018-09-30	135
2018-12-31	127
2019-03-31	134
2019-06-30	88
2019-09-30	107
2019-12-31	150
2020-03-31	177
2020-06-30	118
2020-09-30	148
2020-12-31	164
2021-03-31	129
2021-06-30	183
2021-09-30	118
2021-12-31	98
2022-03-31	95
2022-06-30	89
2022-09-30	85
2022-12-31	88
2023-03-31	93
2023-06-30	92
2023-09-30	91