Quarter	US dollars
1999-03-31	39
1999-06-30	34
1999-09-30	47
1999-12-31	57
2000-03-31	64
2000-06-30	64
2000-09-30	69
2000-12-31	59
2001-03-31	67
2001-06-30	46
2001-09-30	60
2001-12-31	63
2002-03-31	50
2002-06-30	53
2002-09-30	48
2002-12-31	35
2003-03-31	38
2003-06-30	42
2003-09-30	45
2003-12-31	44
2004-03-31	47
2004-06-30	47
2004-09-30	53
2004-12-31	63
2005-03-31	59
2005-06-30	34
2005-09-30	41
2005-12-31	55
2006-03-31	69
2006-06-30	76
2006-09-30	68
2006-12-31	85
2007-03-31	83
2007-06-30	102
2007-09-30	99
2007-12-31	102
2008-03-31	101
2008-06-30	155
2008-09-30	115
2008-12-31	125
2009-03-31	126
2009-06-30	135
2009-09-30	138
2009-12-31	151
2010-03-31	153
2010-06-30	147
2010-09-30	144
2010-12-31	142
2011-03-31	141
2011-06-30	134
2011-09-30	137
2011-12-31	151
2012-03-31	130
2012-06-30	150
2012-09-30	145
2012-12-31	123
2013-03-31	124
2013-06-30	123
2013-09-30	122
2013-12-31	117
2014-03-31	117
2014-06-30	103
2014-09-30	103
2014-12-31	96
2015-03-31	95
2015-06-30	83
2015-09-30	81
2015-12-31	80
2016-03-31	79
2016-06-30	79
2016-09-30	77
2016-12-31	76
2017-03-31	76
2017-06-30	77
2017-09-30	76
2017-12-31	77
2018-03-31	104
2018-06-30	105
2018-09-30	104
2018-12-31	104
2019-03-31	104
2019-06-30	97
2019-09-30	96
2019-12-31	96
2020-03-31	96
2020-06-30	96
2020-09-30	96
2020-12-31	97
2021-03-31	96
2021-06-30	96
2021-09-30	89
2021-12-31	87
2022-03-31	87
2022-06-30	87
2022-09-30	87
2022-12-31	86
2023-03-31	59
2023-06-30	58
2023-09-30	58