Quarter	US dollars
1999-03-31	100
1999-06-30	64
1999-09-30	102
1999-12-31	90
2000-03-31	110
2000-06-30	49
2000-09-30	74
2000-12-31	38
2001-03-31	75
2001-06-30	43
2001-09-30	70
2001-12-31	42
2002-03-31	47
2002-06-30	26
2002-09-30	18
2002-12-31	18
2003-03-31	28
2003-06-30	20
2003-09-30	30
2003-12-31	37
2004-03-31	30
2004-06-30	30
2004-09-30	31
2004-12-31	14
2005-03-31	24
2005-06-30	18
2005-09-30	13
2005-12-31	13
2006-03-31	37
2006-06-30	19
2006-09-30	29
2006-12-31	65
2007-03-31	42
2007-06-30	19
2007-09-30	29
2007-12-31	63
2008-03-31	49
2008-06-30	41
2008-09-30	48
2008-12-31	59
2009-03-31	92
2009-06-30	51
2009-09-30	52
2009-12-31	67
2010-03-31	101
2010-06-30	51
2010-09-30	35
2010-12-31	17
2011-03-31	67
2011-06-30	51
2011-09-30	39
2011-12-31	24
2012-03-31	48
2012-06-30	30
2012-09-30	41
2012-12-31	46
2013-03-31	24
2013-06-30	7
2013-09-30	4
2013-12-31	7
2014-03-31	27
2014-06-30	37
2014-09-30	48
2014-12-31	35
2015-03-31	45
2015-06-30	45
2015-09-30	59
2015-12-31	45
2016-03-31	53
2016-06-30	71
2016-09-30	55
2016-12-31	68
2017-03-31	167
2017-06-30	166
2017-09-30	143
2017-12-31	190
2018-03-31	78
2018-06-30	101
2018-09-30	127
2018-12-31	114
2019-03-31	153
2019-06-30	136
2019-09-30	162
2019-12-31	156
2020-03-31	251
2020-06-30	166
2020-09-30	134
2020-12-31	107
2021-03-31	130
2021-06-30	43
2021-09-30	74
2021-12-31	48
2022-03-31	105
2022-06-30	105
2022-09-30	101
2022-12-31	15
2023-03-31	9
2023-06-30	5
2023-09-30	5