Quarter	US dollars
1999-09-30	9709
1999-12-31	8970
2000-03-31	9503
2000-06-30	9652
2000-09-30	9282
2000-12-31	10380
2001-03-31	10492
2001-06-30	9465
2001-09-30	9202
2001-12-31	9901
2002-03-31	10150
2002-06-30	10442
2002-09-30	10236
2002-12-31	11009
2003-03-31	11743
2003-06-30	12081
2003-09-30	13007
2003-12-31	14711
2004-03-31	14788
2004-06-30	15643
2004-09-30	16735
2004-12-31	12055
2005-03-31	13567
2005-06-30	14087
2005-09-30	15813
2005-12-31	16467
2006-03-31	20542
2006-06-30	22165
2006-09-30	24410
2006-12-31	25848
2007-03-31	29690
2007-06-30	32345
2007-09-30	37058
2007-12-31	39681
2008-03-31	43409
2008-06-30	43114
2008-09-30	44351
2008-12-31	33292
2009-03-31	32392
2009-06-30	35727
2009-09-30	38142
2009-12-31	34539
2010-03-31	37443
2010-06-30	47700
2010-09-30	54005
2010-12-31	54116
2011-03-31	61656
2011-06-30	63002
2011-09-30	54160
2011-12-31	58422
2012-03-31	65866
2012-06-30	64968
2012-09-30	71803
2012-12-31	69013
2013-03-31	75025
2013-06-30	68937
2013-09-30	65882
2013-12-31	68477
2014-03-31	63146
2014-06-30	64953
2014-09-30	61690
2014-12-31	57189
2015-03-31	51476
2015-06-30	50621
2015-09-30	47472
2015-12-31	40131
2016-03-31	39627
2016-06-30	42758
2016-09-30	43600
2016-12-31	36833
2017-03-31	38981
2017-06-30	39518
2017-09-30	37758
2017-12-31	37315
2018-03-31	38560
2018-06-30	29917
2018-09-30	27630
2018-12-31	25556
2019-03-31	26245
2019-06-30	27288
2019-09-30	24846
2019-12-31	25491
2020-03-31	21370
2020-06-30	20743
2020-09-30	23036
2020-12-31	26258
2021-03-31	23670
2021-06-30	22062
2021-09-30	21208
2021-12-31	21552
2022-03-31	24044
2022-06-30	24752
2022-09-30	25742
2022-12-31	21567
2023-03-31	20907
2023-06-30	21714
2023-09-30	23464