Quarter	US dollars
1999-03-31	62
1999-06-30	36
1999-09-30	16
1999-12-31	18
2000-03-31	62
2000-06-30	20
2000-09-30	29
2000-12-31	28
2001-03-31	33
2001-06-30	19
2001-09-30	21
2001-12-31	34
2002-03-31	46
2002-06-30	57
2002-09-30	60
2002-12-31	75
2003-03-31	39
2003-06-30	58
2003-09-30	127
2003-12-31	90
2004-03-31	169
2004-06-30	390
2004-09-30	525
2004-12-31	920
2005-03-31	1050
2005-06-30	1324
2005-09-30	1832
2005-12-31	2908
2006-03-31	3044
2006-06-30	2722
2006-09-30	3023
2006-12-31	3708
2007-03-31	3904
2007-06-30	4096
2007-09-30	4125
2007-12-31	4362
2008-03-31	4377
2008-06-30	4453
2008-09-30	4062
2008-12-31	3382
2009-03-31	2973
2009-06-30	3418
2009-09-30	3449
2009-12-31	2771
2010-03-31	2809
2010-06-30	2912
2010-09-30	3323
2010-12-31	3049
2011-03-31	2835
2011-06-30	2762
2011-09-30	2179
2011-12-31	1833
2012-03-31	1816
2012-06-30	1663
2012-09-30	1707
2012-12-31	1805
2013-03-31	1783
2013-06-30	1497
2013-09-30	1111
2013-12-31	1215
2014-03-31	1181
2014-06-30	962
2014-09-30	479
2014-12-31	340
2015-03-31	270
2015-06-30	197
2015-09-30	225
2015-12-31	152
2016-03-31	161
2016-06-30	146
2016-09-30	135
2016-12-31	79
2017-03-31	194
2017-06-30	392
2017-09-30	744
2017-12-31	512
2018-03-31	547
2018-06-30	520
2018-09-30	736
2018-12-31	651
2019-03-31	373
2019-06-30	442
2019-09-30	710
2019-12-31	1147
2020-03-31	652
2020-06-30	739
2020-09-30	1002
2020-12-31	1193
2021-03-31	1043
2021-06-30	1078
2021-09-30	1055
2021-12-31	691
2022-03-31	604
2022-06-30	591
2022-09-30	566
2022-12-31	522
2023-03-31	554
2023-06-30	563
2023-09-30	602