Quarter	US dollars
1999-09-30	1816
1999-12-31	1578
2000-03-31	2460
2000-06-30	2413
2000-09-30	2349
2000-12-31	2527
2001-03-31	3679
2001-06-30	3712
2001-09-30	3485
2001-12-31	3640
2002-03-31	3372
2002-06-30	3854
2002-09-30	4862
2002-12-31	4019
2003-03-31	4353
2003-06-30	3688
2003-09-30	4886
2003-12-31	4535
2004-03-31	6405
2004-06-30	6263
2004-09-30	7084
2004-12-31	8755
2005-03-31	10375
2005-06-30	10346
2005-09-30	11681
2005-12-31	11745
2006-03-31	11963
2006-06-30	12071
2006-09-30	12967
2006-12-31	13268
2007-03-31	13101
2007-06-30	14161
2007-09-30	18076
2007-12-31	19208
2008-03-31	21131
2008-06-30	16854
2008-09-30	18751
2008-12-31	11839
2009-03-31	10310
2009-06-30	9616
2009-09-30	8881
2009-12-31	10010
2010-03-31	9695
2010-06-30	10434
2010-09-30	10269
2010-12-31	8909
2011-03-31	10264
2011-06-30	9513
2011-09-30	9717
2011-12-31	9338
2012-03-31	10418
2012-06-30	10190
2012-09-30	10725
2012-12-31	10157
2013-03-31	9904
2013-06-30	10327
2013-09-30	9896
2013-12-31	7879
2014-03-31	8612
2014-06-30	8229
2014-09-30	8241
2014-12-31	7895
2015-03-31	7905
2015-06-30	8594
2015-09-30	9000
2015-12-31	6248
2016-03-31	6270
2016-06-30	6341
2016-09-30	5307
2016-12-31	5554
2017-03-31	4539
2017-06-30	5692
2017-09-30	5982
2017-12-31	5992
2018-03-31	6684
2018-06-30	6508
2018-09-30	5870
2018-12-31	6798
2019-03-31	6654
2019-06-30	6872
2019-09-30	7163
2019-12-31	7534
2020-03-31	7083
2020-06-30	7387
2020-09-30	7116
2020-12-31	7260
2021-03-31	6942
2021-06-30	6770
2021-09-30	7064
2021-12-31	7641
2022-03-31	7850
2022-06-30	7591
2022-09-30	7074
2022-12-31	7924
2023-03-31	7434
2023-06-30	7680
2023-09-30	7394