Quarter	US dollars
1999-03-31	33
1999-06-30	33
1999-09-30	36
1999-12-31	31
2000-03-31	32
2000-06-30	30
2000-09-30	31
2000-12-31	31
2001-03-31	29
2001-06-30	26
2001-09-30	26
2001-12-31	31
2002-03-31	27
2002-06-30	29
2002-09-30	29
2002-12-31	25
2003-03-31	25
2003-06-30	26
2003-09-30	26
2003-12-31	26
2004-03-31	27
2004-06-30	26
2004-09-30	26
2004-12-31	26
2005-03-31	26
2005-06-30	25
2005-09-30	25
2005-12-31	59
2006-03-31	43
2006-06-30	51
2006-09-30	142
2006-12-31	493
2007-03-31	362
2007-06-30	361
2007-09-30	351
2007-12-31	271
2008-03-31	267
2008-06-30	228
2008-09-30	128
2008-12-31	64
2009-03-31	73
2009-06-30	70
2009-09-30	62
2009-12-31	78
2010-03-31	89
2010-06-30	54
2010-09-30	48
2010-12-31	41
2011-03-31	41
2011-06-30	40
2011-09-30	43
2011-12-31	45
2012-03-31	43
2012-06-30	80
2012-09-30	38
2012-12-31	38
2013-03-31	37
2013-06-30	41
2013-09-30	40
2013-12-31	35
2014-03-31	34
2014-06-30	36
2014-09-30	27
2014-12-31	29
2015-03-31	25
2015-06-30	30
2015-09-30	28
2015-12-31	30
2016-03-31	31
2016-06-30	36
2016-09-30	64
2016-12-31	68
2017-03-31	28
2017-06-30	26
2017-09-30	37
2017-12-31	34
2018-03-31	33
2018-06-30	39
2018-09-30	35
2018-12-31	30
2019-03-31	43
2019-06-30	46
2019-09-30	34
2019-12-31	33
2020-03-31	36
2020-06-30	35
2020-09-30	46
2020-12-31	30
2021-03-31	36
2021-06-30	62
2021-09-30	58
2021-12-31	29
2022-03-31	31
2022-06-30	32
2022-09-30	27
2022-12-31	27
2023-03-31	27
2023-06-30	31
2023-09-30	28