Quarter	US dollars
1999-03-31	642
1999-06-30	654
1999-09-30	692
1999-12-31	667
2000-03-31	788
2000-06-30	770
2000-09-30	777
2000-12-31	697
2001-03-31	673
2001-06-30	684
2001-09-30	763
2001-12-31	762
2002-03-31	655
2002-06-30	715
2002-09-30	631
2002-12-31	595
2003-03-31	627
2003-06-30	625
2003-09-30	523
2003-12-31	742
2004-03-31	957
2004-06-30	1050
2004-09-30	1254
2004-12-31	2164
2005-03-31	2020
2005-06-30	2863
2005-09-30	2862
2005-12-31	2750
2006-03-31	3042
2006-06-30	3397
2006-09-30	4461
2006-12-31	7199
2007-03-31	10392
2007-06-30	15838
2007-09-30	19116
2007-12-31	27013
2008-03-31	27009
2008-06-30	28722
2008-09-30	23236
2008-12-31	8590
2009-03-31	8510
2009-06-30	10085
2009-09-30	9422
2009-12-31	10065
2010-03-31	11166
2010-06-30	10418
2010-09-30	13021
2010-12-31	5073
2011-03-31	2919
2011-06-30	3207
2011-09-30	2997
2011-12-31	2445
2012-03-31	2669
2012-06-30	2340
2012-09-30	2424
2012-12-31	2575
2013-03-31	2893
2013-06-30	2469
2013-09-30	2512
2013-12-31	2822
2014-03-31	3650
2014-06-30	4051
2014-09-30	4114
2014-12-31	4102
2015-03-31	3990
2015-06-30	4036
2015-09-30	4535
2015-12-31	5322
2016-03-31	4733
2016-06-30	4605
2016-09-30	3027
2016-12-31	2867
2017-03-31	2829
2017-06-30	3080
2017-09-30	172
2017-12-31	269
2018-03-31	402
2018-06-30	230
2018-09-30	267
2018-12-31	287
2019-03-31	348
2019-06-30	361
2019-09-30	254
2019-12-31	167
2020-03-31	180
2020-06-30	172
2020-09-30	404
2020-12-31	283
2021-03-31	218
2021-06-30	215
2021-09-30	205
2021-12-31	177
2022-03-31	221
2022-06-30	213
2022-09-30	178
2022-12-31	169
2023-03-31	134
2023-06-30	140
2023-09-30	169