Quarter	US dollars
1999-03-31	8
1999-06-30	6
1999-09-30	6
1999-12-31	5
2000-03-31	5
2000-06-30	5
2000-09-30	34
2000-12-31	5
2001-03-31	5
2001-06-30	6
2001-09-30	6
2001-12-31	6
2002-03-31	6
2002-06-30	15
2002-09-30	25
2002-12-31	17
2003-03-31	5
2003-06-30	20
2003-09-30	10
2003-12-31	23
2004-03-31	12
2004-06-30	6
2004-09-30	7
2004-12-31	17
2005-03-31	16
2005-06-30	13
2005-09-30	17
2005-12-31	43
2006-03-31	33
2006-06-30	79
2006-09-30	240
2006-12-31	319
2007-03-31	222
2007-06-30	156
2007-09-30	53
2007-12-31	35
2008-03-31	43
2008-06-30	85
2008-09-30	44
2008-12-31	36
2009-03-31	59
2009-06-30	86
2009-09-30	254
2009-12-31	644
2010-03-31	562
2010-06-30	478
2010-09-30	228
2010-12-31	428
2011-03-31	793
2011-06-30	58
2011-09-30	76
2011-12-31	72
2012-03-31	98
2012-06-30	112
2012-09-30	150
2012-12-31	211
2013-03-31	231
2013-06-30	239
2013-09-30	279
2013-12-31	412
2014-03-31	407
2014-06-30	421
2014-09-30	723
2014-12-31	315
2015-03-31	530
2015-06-30	584
2015-09-30	994
2015-12-31	886
2016-03-31	842
2016-06-30	943
2016-09-30	990
2016-12-31	981
2017-03-31	1356
2017-06-30	817
2017-09-30	1328
2017-12-31	1232
2018-03-31	965
2018-06-30	881
2018-09-30	1389
2018-12-31	1249
2019-03-31	1327
2019-06-30	713
2019-09-30	995
2019-12-31	784
2020-03-31	1482
2020-06-30	2007
2020-09-30	2063
2020-12-31	944
2021-03-31	892
2021-06-30	342
2021-09-30	215
2021-12-31	190
2022-03-31	193
2022-06-30	217
2022-09-30	212
2022-12-31	201
2023-03-31	199
2023-06-30	167
2023-09-30	151