Quarter	US dollars
1999-09-30	1759
1999-12-31	2866
2000-03-31	2985
2000-06-30	2865
2000-09-30	2952
2000-12-31	3142
2001-03-31	3264
2001-06-30	3421
2001-09-30	3450
2001-12-31	2163
2002-03-31	2105
2002-06-30	2687
2002-09-30	2868
2002-12-31	3084
2003-03-31	2815
2003-06-30	3309
2003-09-30	3690
2003-12-31	3934
2004-03-31	4211
2004-06-30	3818
2004-09-30	4031
2004-12-31	6044
2005-03-31	7501
2005-06-30	6768
2005-09-30	5538
2005-12-31	4489
2006-03-31	5975
2006-06-30	8002
2006-09-30	7889
2006-12-31	9317
2007-03-31	10462
2007-06-30	11047
2007-09-30	12210
2007-12-31	12893
2008-03-31	14378
2008-06-30	13883
2008-09-30	13485
2008-12-31	10703
2009-03-31	16125
2009-06-30	18250
2009-09-30	18323
2009-12-31	18475
2010-03-31	12206
2010-06-30	11340
2010-09-30	11722
2010-12-31	11633
2011-03-31	12173
2011-06-30	10982
2011-09-30	8754
2011-12-31	8745
2012-03-31	8847
2012-06-30	9239
2012-09-30	10250
2012-12-31	10042
2013-03-31	8893
2013-06-30	8334
2013-09-30	8764
2013-12-31	9808
2014-03-31	9877
2014-06-30	9761
2014-09-30	8106
2014-12-31	8488
2015-03-31	8204
2015-06-30	9752
2015-09-30	9476
2015-12-31	8976
2016-03-31	8858
2016-06-30	8678
2016-09-30	7974
2016-12-31	6190
2017-03-31	5552
2017-06-30	5360
2017-09-30	5754
2017-12-31	5851
2018-03-31	5568
2018-06-30	5091
2018-09-30	4823
2018-12-31	4357
2019-03-31	4352
2019-06-30	4144
2019-09-30	4173
2019-12-31	4396
2020-03-31	4399
2020-06-30	4380
2020-09-30	5786
2020-12-31	4429
2021-03-31	4597
2021-06-30	4653
2021-09-30	4413
2021-12-31	4349
2022-03-31	4092
2022-06-30	3705
2022-09-30	3338
2022-12-31	3699
2023-03-31	3932
2023-06-30	4263
2023-09-30	4049