Quarter	US dollars
1999-03-31	1433
1999-06-30	1442
1999-09-30	1468
1999-12-31	1307
2000-03-31	1163
2000-06-30	2886
2000-09-30	3579
2000-12-31	4228
2001-03-31	4382
2001-06-30	4142
2001-09-30	3415
2001-12-31	3436
2002-03-31	3267
2002-06-30	2818
2002-09-30	4149
2002-12-31	3064
2003-03-31	3644
2003-06-30	4411
2003-09-30	4215
2003-12-31	5555
2004-03-31	5048
2004-06-30	4484
2004-09-30	4290
2004-12-31	4043
2005-03-31	5115
2005-06-30	5954
2005-09-30	5158
2005-12-31	6035
2006-03-31	6638
2006-06-30	5578
2006-09-30	6250
2006-12-31	5992
2007-03-31	8041
2007-06-30	8599
2007-09-30	6157
2007-12-31	6097
2008-03-31	6892
2008-06-30	4288
2008-09-30	3102
2008-12-31	2410
2009-03-31	4740
2009-06-30	6188
2009-09-30	4496
2009-12-31	5980
2010-03-31	5141
2010-06-30	3783
2010-09-30	5154
2010-12-31	4502
2011-03-31	2961
2011-06-30	3959
2011-09-30	4430
2011-12-31	4930
2012-03-31	3961
2012-06-30	2537
2012-09-30	4437
2012-12-31	3289
2013-03-31	4045
2013-06-30	3273
2013-09-30	4121
2013-12-31	4506
2014-03-31	4034
2014-06-30	3680
2014-09-30	2905
2014-12-31	3360
2015-03-31	3828
2015-06-30	3720
2015-09-30	5799
2015-12-31	4064
2016-03-31	3858
2016-06-30	3674
2016-09-30	2148
2016-12-31	1605
2017-03-31	3021
2017-06-30	1896
2017-09-30	2216
2017-12-31	2393
2018-03-31	3045
2018-06-30	2519
2018-09-30	1631
2018-12-31	1866
2019-03-31	1758
2019-06-30	2019
2019-09-30	1886
2019-12-31	2582
2020-03-31	2269
2020-06-30	1885
2020-09-30	1878
2020-12-31	1589
2021-03-31	1820
2021-06-30	1045
2021-09-30	995
2021-12-31	955
2022-03-31	882
2022-06-30	892
2022-09-30	1022
2022-12-31	746
2023-03-31	853
2023-06-30	806
2023-09-30	859