Quarter	US dollars
1999-03-31	7299
1999-06-30	6560
1999-09-30	6174
1999-12-31	6147
2000-03-31	11233
2000-06-30	6820
2000-09-30	11655
2000-12-31	7486
2001-03-31	9675
2001-06-30	10520
2001-09-30	10655
2001-12-31	7944
2002-03-31	8082
2002-06-30	7784
2002-09-30	8960
2002-12-31	8226
2003-03-31	7047
2003-06-30	10767
2003-09-30	11031
2003-12-31	14995
2004-03-31	10162
2004-06-30	8911
2004-09-30	8371
2004-12-31	10693
2005-03-31	7949
2005-06-30	10974
2005-09-30	10153
2005-12-31	9546
2006-03-31	10632
2006-06-30	10346
2006-09-30	11448
2006-12-31	12575
2007-03-31	12363
2007-06-30	16170
2007-09-30	16162
2007-12-31	19807
2008-03-31	19244
2008-06-30	21356
2008-09-30	22248
2008-12-31	19486
2009-03-31	18992
2009-06-30	18502
2009-09-30	19474
2009-12-31	18245
2010-03-31	18413
2010-06-30	20557
2010-09-30	26954
2010-12-31	25695
2011-03-31	24287
2011-06-30	20636
2011-09-30	22367
2011-12-31	21104
2012-03-31	18707
2012-06-30	20312
2012-09-30	17244
2012-12-31	15152
2013-03-31	14686
2013-06-30	18714
2013-09-30	16028
2013-12-31	14859
2014-03-31	13434
2014-06-30	16980
2014-09-30	16612
2014-12-31	18371
2015-03-31	21398
2015-06-30	22242
2015-09-30	25508
2015-12-31	19160
2016-03-31	21929
2016-06-30	25511
2016-09-30	24229
2016-12-31	21055
2017-03-31	19177
2017-06-30	24102
2017-09-30	26735
2017-12-31	28141
2018-03-31	26442
2018-06-30	26857
2018-09-30	25428
2018-12-31	36867
2019-03-31	31880
2019-06-30	34905
2019-09-30	35050
2019-12-31	40168
2020-03-31	43519
2020-06-30	41524
2020-09-30	40170
2020-12-31	44956
2021-03-31	51379
2021-06-30	63145
2021-09-30	63635
2021-12-31	67244
2022-03-31	64067
2022-06-30	66687
2022-09-30	61865
2022-12-31	64005
2023-03-31	74526
2023-06-30	63417
2023-09-30	67706