Quarter	US dollars
1999-03-31	55
1999-06-30	4
1999-09-30	1
1999-12-31	2
2000-03-31	12
2000-06-30	1
2000-09-30	9
2000-12-31	10
2001-03-31	25
2001-06-30	38
2001-09-30	54
2001-12-31	51
2002-03-31	48
2002-06-30	36
2002-09-30	24
2002-12-31	82
2003-03-31	49
2003-06-30	74
2003-09-30	103
2003-12-31	105
2004-03-31	126
2004-06-30	128
2004-09-30	151
2004-12-31	145
2005-03-31	433
2005-06-30	264
2005-09-30	364
2005-12-31	901
2006-03-31	944
2006-06-30	1106
2006-09-30	1380
2006-12-31	1951
2007-03-31	2024
2007-06-30	3306
2007-09-30	3713
2007-12-31	4927
2008-03-31	4499
2008-06-30	4318
2008-09-30	3832
2008-12-31	3013
2009-03-31	2824
2009-06-30	2405
2009-09-30	2302
2009-12-31	2206
2010-03-31	1894
2010-06-30	1776
2010-09-30	1696
2010-12-31	1987
2011-03-31	2453
2011-06-30	1715
2011-09-30	1128
2011-12-31	1000
2012-03-31	1066
2012-06-30	819
2012-09-30	686
2012-12-31	407
2013-03-31	634
2013-06-30	522
2013-09-30	707
2013-12-31	515
2014-03-31	411
2014-06-30	406
2014-09-30	464
2014-12-31	388
2015-03-31	203
2015-06-30	130
2015-09-30	255
2015-12-31	210
2016-03-31	278
2016-06-30	289
2016-09-30	236
2016-12-31	91
2017-03-31	195
2017-06-30	192
2017-09-30	89
2017-12-31	2
2018-03-31	6
2018-06-30	7
2018-09-30	1
2018-12-31	1
2019-03-31	136
2019-06-30	152
2019-09-30	140
2019-12-31	206
2020-03-31	294
2020-06-30	134
2020-09-30	129
2020-12-31	18
2021-03-31	10
2021-06-30	20
2021-09-30	22
2021-12-31	32
2022-03-31	28
2022-06-30	16
2022-09-30	109
2022-12-31	11
2023-03-31	2
2023-06-30	-3
2023-09-30	6