Quarter	US dollars
1999-03-31	1195
1999-06-30	1419
1999-09-30	1438
1999-12-31	1592
2000-03-31	2217
2000-06-30	2786
2000-09-30	3038
2000-12-31	3010
2001-03-31	3095
2001-06-30	2907
2001-09-30	2982
2001-12-31	3430
2002-03-31	3608
2002-06-30	3956
2002-09-30	4947
2002-12-31	4420
2003-03-31	5418
2003-06-30	3430
2003-09-30	3444
2003-12-31	3631
2004-03-31	3598
2004-06-30	3620
2004-09-30	3430
2004-12-31	3697
2005-03-31	4257
2005-06-30	4300
2005-09-30	4250
2005-12-31	4665
2006-03-31	5827
2006-06-30	6557
2006-09-30	7053
2006-12-31	9362
2007-03-31	8363
2007-06-30	8930
2007-09-30	10718
2007-12-31	12232
2008-03-31	12708
2008-06-30	13466
2008-09-30	12907
2008-12-31	8711
2009-03-31	7447
2009-06-30	7452
2009-09-30	7576
2009-12-31	9054
2010-03-31	10441
2010-06-30	9743
2010-09-30	9835
2010-12-31	8506
2011-03-31	7063
2011-06-30	6055
2011-09-30	6238
2011-12-31	6467
2012-03-31	8557
2012-06-30	7947
2012-09-30	8522
2012-12-31	9944
2013-03-31	9521
2013-06-30	9523
2013-09-30	9410
2013-12-31	10085
2014-03-31	9066
2014-06-30	9390
2014-09-30	8999
2014-12-31	9859
2015-03-31	7512
2015-06-30	8430
2015-09-30	6997
2015-12-31	5931
2016-03-31	5798
2016-06-30	7405
2016-09-30	7490
2016-12-31	7563
2017-03-31	10479
2017-06-30	11045
2017-09-30	12044
2017-12-31	14338
2018-03-31	19071
2018-06-30	18700
2018-09-30	18697
2018-12-31	18574
2019-03-31	19208
2019-06-30	19399
2019-09-30	14598
2019-12-31	9072
2020-03-31	8486
2020-06-30	8702
2020-09-30	8115
2020-12-31	9341
2021-03-31	10799
2021-06-30	11196
2021-09-30	13035
2021-12-31	13558
2022-03-31	13681
2022-06-30	15460
2022-09-30	14526
2022-12-31	13907
2023-03-31	11867
2023-06-30	10082
2023-09-30	10520