Quarter	US dollars
1999-03-31	1155
1999-06-30	1272
1999-09-30	1171
1999-12-31	1915
2000-03-31	1945
2000-06-30	2414
2000-09-30	3465
2000-12-31	2222
2001-03-31	4134
2001-06-30	3955
2001-09-30	2609
2001-12-31	2233
2002-03-31	1668
2002-06-30	1518
2002-09-30	1680
2002-12-31	1848
2003-03-31	2144
2003-06-30	3105
2003-09-30	3744
2003-12-31	7545
2004-03-31	8858
2004-06-30	5003
2004-09-30	5232
2004-12-31	5214
2005-03-31	5492
2005-06-30	5006
2005-09-30	4758
2005-12-31	6535
2006-03-31	4850
2006-06-30	8017
2006-09-30	10318
2006-12-31	11352
2007-03-31	14457
2007-06-30	13013
2007-09-30	19168
2007-12-31	11726
2008-03-31	16624
2008-06-30	9392
2008-09-30	6945
2008-12-31	4481
2009-03-31	3247
2009-06-30	3332
2009-09-30	4530
2009-12-31	3993
2010-03-31	4470
2010-06-30	5429
2010-09-30	5349
2010-12-31	4488
2011-03-31	11290
2011-06-30	7683
2011-09-30	7785
2011-12-31	6099
2012-03-31	6941
2012-06-30	5681
2012-09-30	5760
2012-12-31	5382
2013-03-31	5011
2013-06-30	4839
2013-09-30	5637
2013-12-31	6203
2014-03-31	6468
2014-06-30	6482
2014-09-30	6607
2014-12-31	6206
2015-03-31	5676
2015-06-30	6452
2015-09-30	5694
2015-12-31	5037
2016-03-31	6230
2016-06-30	5522
2016-09-30	6579
2016-12-31	6121
2017-03-31	6613
2017-06-30	7948
2017-09-30	7945
2017-12-31	7692
2018-03-31	8820
2018-06-30	7395
2018-09-30	7783
2018-12-31	7035
2019-03-31	5845
2019-06-30	7905
2019-09-30	5979
2019-12-31	4381
2020-03-31	5460
2020-06-30	5846
2020-09-30	5995
2020-12-31	5752
2021-03-31	7000
2021-06-30	6350
2021-09-30	6406
2021-12-31	6689
2022-03-31	5615
2022-06-30	5358
2022-09-30	6626
2022-12-31	6079
2023-03-31	4410
2023-06-30	5854
2023-09-30	6097