Quarter	US dollars
1999-03-31	27
1999-06-30	26
1999-09-30	30
1999-12-31	22
2000-03-31	24
2000-06-30	20
2000-09-30	26
2000-12-31	26
2001-03-31	18
2001-06-30	26
2001-09-30	22
2001-12-31	18
2002-03-31	17
2002-06-30	22
2002-09-30	16
2002-12-31	23
2003-03-31	23
2003-06-30	21
2003-09-30	16
2003-12-31	60
2004-03-31	37
2004-06-30	54
2004-09-30	78
2004-12-31	49
2005-03-31	54
2005-06-30	44
2005-09-30	43
2005-12-31	33
2006-03-31	67
2006-06-30	68
2006-09-30	47
2006-12-31	246
2007-03-31	205
2007-06-30	404
2007-09-30	159
2007-12-31	152
2008-03-31	244
2008-06-30	235
2008-09-30	146
2008-12-31	117
2009-03-31	59
2009-06-30	158
2009-09-30	134
2009-12-31	170
2010-03-31	158
2010-06-30	184
2010-09-30	195
2010-12-31	389
2011-03-31	96
2011-06-30	142
2011-09-30	198
2011-12-31	224
2012-03-31	187
2012-06-30	244
2012-09-30	173
2012-12-31	200
2013-03-31	238
2013-06-30	406
2013-09-30	496
2013-12-31	407
2014-03-31	543
2014-06-30	463
2014-09-30	402
2014-12-31	314
2015-03-31	305
2015-06-30	414
2015-09-30	458
2015-12-31	332
2016-03-31	777
2016-06-30	558
2016-09-30	372
2016-12-31	543
2017-03-31	743
2017-06-30	782
2017-09-30	843
2017-12-31	823
2018-03-31	609
2018-06-30	794
2018-09-30	761
2018-12-31	738
2019-03-31	714
2019-06-30	765
2019-09-30	857
2019-12-31	939
2020-03-31	1134
2020-06-30	1148
2020-09-30	1072
2020-12-31	960
2021-03-31	1200
2021-06-30	1118
2021-09-30	1242
2021-12-31	1293
2022-03-31	1162
2022-06-30	1194
2022-09-30	1308
2022-12-31	860
2023-03-31	864
2023-06-30	887
2023-09-30	903