Quarter	US dollars
1999-03-31	66
1999-06-30	57
1999-09-30	56
1999-12-31	60
2000-03-31	59
2000-06-30	59
2000-09-30	60
2000-12-31	69
2001-03-31	78
2001-06-30	78
2001-09-30	82
2001-12-31	78
2002-03-31	70
2002-06-30	72
2002-09-30	71
2002-12-31	71
2003-03-31	72
2003-06-30	68
2003-09-30	68
2003-12-31	70
2004-03-31	69
2004-06-30	65
2004-09-30	69
2004-12-31	64
2005-03-31	66
2005-06-30	70
2005-09-30	68
2005-12-31	68
2006-03-31	70
2006-06-30	75
2006-09-30	88
2006-12-31	92
2007-03-31	96
2007-06-30	94
2007-09-30	95
2007-12-31	95
2008-03-31	103
2008-06-30	103
2008-09-30	95
2008-12-31	94
2009-03-31	90
2009-06-30	92
2009-09-30	104
2009-12-31	116
2010-03-31	101
2010-06-30	85
2010-09-30	86
2010-12-31	91
2011-03-31	108
2011-06-30	119
2011-09-30	115
2011-12-31	119
2012-03-31	126
2012-06-30	121
2012-09-30	136
2012-12-31	135
2013-03-31	145
2013-06-30	117
2013-09-30	165
2013-12-31	151
2014-03-31	131
2014-06-30	118
2014-09-30	106
2014-12-31	100
2015-03-31	91
2015-06-30	88
2015-09-30	90
2015-12-31	85
2016-03-31	86
2016-06-30	85
2016-09-30	64
2016-12-31	76
2017-03-31	67
2017-06-30	68
2017-09-30	60
2017-12-31	67
2018-03-31	47
2018-06-30	39
2018-09-30	29
2018-12-31	27
2019-03-31	28
2019-06-30	20
2019-09-30	22
2019-12-31	22
2020-03-31	20
2020-06-30	22
2020-09-30	22
2020-12-31	23
2021-03-31	75
2021-06-30	42
2021-09-30	24
2021-12-31	25
2022-03-31	24
2022-06-30	23
2022-09-30	20
2022-12-31	21
2023-03-31	21
2023-06-30	22
2023-09-30	24