Quarter	US dollars
1999-09-30	2397
1999-12-31	2263
2000-03-31	2875
2000-06-30	2948
2000-09-30	3585
2000-12-31	3352
2001-03-31	3975
2001-06-30	3545
2001-09-30	3432
2001-12-31	3876
2002-03-31	3173
2002-06-30	6997
2002-09-30	5963
2002-12-31	7380
2003-03-31	7814
2003-06-30	9726
2003-09-30	9816
2003-12-31	12286
2004-03-31	9971
2004-06-30	8154
2004-09-30	7730
2004-12-31	10179
2005-03-31	7080
2005-06-30	10291
2005-09-30	9097
2005-12-31	7968
2006-03-31	6848
2006-06-30	9364
2006-09-30	8358
2006-12-31	7288
2007-03-31	7684
2007-06-30	10871
2007-09-30	13842
2007-12-31	12561
2008-03-31	25671
2008-06-30	23654
2008-09-30	26632
2008-12-31	38204
2009-03-31	34318
2009-06-30	22998
2009-09-30	23259
2009-12-31	18199
2010-03-31	19068
2010-06-30	23556
2010-09-30	26500
2010-12-31	26291
2011-03-31	21817
2011-06-30	21645
2011-09-30	30864
2011-12-31	27381
2012-03-31	24050
2012-06-30	17421
2012-09-30	13764
2012-12-31	13639
2013-03-31	12110
2013-06-30	11255
2013-09-30	8670
2013-12-31	7747
2014-03-31	6084
2014-06-30	6639
2014-09-30	12692
2014-12-31	11520
2015-03-31	12746
2015-06-30	7684
2015-09-30	9493
2015-12-31	7300
2016-03-31	7863
2016-06-30	9438
2016-09-30	6666
2016-12-31	7189
2017-03-31	4578
2017-06-30	5405
2017-09-30	6578
2017-12-31	5973
2018-03-31	6374
2018-06-30	3908
2018-09-30	5660
2018-12-31	6466
2019-03-31	5626
2019-06-30	5658
2019-09-30	7635
2019-12-31	8102
2020-03-31	10161
2020-06-30	7962
2020-09-30	7974
2020-12-31	10320
2021-03-31	11496
2021-06-30	6930
2021-09-30	6333
2021-12-31	5706
2022-03-31	6393
2022-06-30	8374
2022-09-30	9520
2022-12-31	8166
2023-03-31	5474
2023-06-30	6069
2023-09-30	7224