Quarter	US dollars
1999-03-31	3673
1999-06-30	3353
1999-09-30	2596
1999-12-31	2122
2000-03-31	2564
2000-06-30	1882
2000-09-30	1985
2000-12-31	1446
2001-03-31	789
2001-06-30	1203
2001-09-30	1659
2001-12-31	1488
2002-03-31	943
2002-06-30	1244
2002-09-30	1862
2002-12-31	1723
2003-03-31	1423
2003-06-30	1894
2003-09-30	3661
2003-12-31	5530
2004-03-31	3810
2004-06-30	3875
2004-09-30	4039
2004-12-31	4013
2005-03-31	4832
2005-06-30	3739
2005-09-30	3489
2005-12-31	4551
2006-03-31	4189
2006-06-30	3432
2006-09-30	3744
2006-12-31	4608
2007-03-31	3874
2007-06-30	5361
2007-09-30	4111
2007-12-31	5380
2008-03-31	6763
2008-06-30	7065
2008-09-30	5747
2008-12-31	10503
2009-03-31	8838
2009-06-30	8204
2009-09-30	6506
2009-12-31	5058
2010-03-31	5046
2010-06-30	5243
2010-09-30	5455
2010-12-31	3421
2011-03-31	5446
2011-06-30	5337
2011-09-30	4786
2011-12-31	3991
2012-03-31	5446
2012-06-30	7325
2012-09-30	5917
2012-12-31	5990
2013-03-31	5435
2013-06-30	4987
2013-09-30	5175
2013-12-31	4432
2014-03-31	6394
2014-06-30	5742
2014-09-30	5592
2014-12-31	5640
2015-03-31	5852
2015-06-30	5247
2015-09-30	6157
2015-12-31	5976
2016-03-31	6459
2016-06-30	5718
2016-09-30	4178
2016-12-31	2830
2017-03-31	2156
2017-06-30	2949
2017-09-30	2638
2017-12-31	2864
2018-03-31	2762
2018-06-30	3143
2018-09-30	4198
2018-12-31	5968
2019-03-31	5519
2019-06-30	5585
2019-09-30	3785
2019-12-31	3879
2020-03-31	3231
2020-06-30	4246
2020-09-30	2923
2020-12-31	3086
2021-03-31	2706
2021-06-30	2499
2021-09-30	2501
2021-12-31	2405
2022-03-31	2216
2022-06-30	1406
2022-09-30	1627
2022-12-31	1659
2023-03-31	1513
2023-06-30	1419
2023-09-30	1461