Quarter	US dollars
1999-03-31	4402
1999-06-30	5075
1999-09-30	4509
1999-12-31	3990
2000-03-31	3171
2000-06-30	4391
2000-09-30	3589
2000-12-31	3616
2001-03-31	3628
2001-06-30	3326
2001-09-30	3672
2001-12-31	3883
2002-03-31	3832
2002-06-30	3299
2002-09-30	3865
2002-12-31	4393
2003-03-31	3755
2003-06-30	3650
2003-09-30	4441
2003-12-31	4279
2004-03-31	5349
2004-06-30	5723
2004-09-30	7636
2004-12-31	6834
2005-03-31	7340
2005-06-30	7303
2005-09-30	5570
2005-12-31	4353
2006-03-31	4962
2006-06-30	6203
2006-09-30	6287
2006-12-31	7484
2007-03-31	7019
2007-06-30	6485
2007-09-30	9548
2007-12-31	9579
2008-03-31	9874
2008-06-30	11173
2008-09-30	11171
2008-12-31	12354
2009-03-31	12461
2009-06-30	14625
2009-09-30	18541
2009-12-31	16211
2010-03-31	17073
2010-06-30	16944
2010-09-30	20193
2010-12-31	20523
2011-03-31	19067
2011-06-30	19463
2011-09-30	17478
2011-12-31	15875
2012-03-31	17333
2012-06-30	16835
2012-09-30	15745
2012-12-31	13764
2013-03-31	14658
2013-06-30	16046
2013-09-30	15358
2013-12-31	14052
2014-03-31	13520
2014-06-30	12164
2014-09-30	12535
2014-12-31	12659
2015-03-31	11538
2015-06-30	10401
2015-09-30	7960
2015-12-31	6942
2016-03-31	7184
2016-06-30	6455
2016-09-30	7430
2016-12-31	7080
2017-03-31	6380
2017-06-30	10401
2017-09-30	6573
2017-12-31	7230
2018-03-31	6790
2018-06-30	7752
2018-09-30	7827
2018-12-31	6098
2019-03-31	5903
2019-06-30	5983
2019-09-30	6098
2019-12-31	7483
2020-03-31	7613
2020-06-30	7968
2020-09-30	7319
2020-12-31	6160
2021-03-31	6909
2021-06-30	7705
2021-09-30	7851
2021-12-31	7587
2022-03-31	7664
2022-06-30	9686
2022-09-30	7019
2022-12-31	8809
2023-03-31	6341
2023-06-30	9543
2023-09-30	10288