Quarter	US dollars
1999-03-31	81600
1999-06-30	88629
1999-09-30	80327
1999-12-31	74446
2000-03-31	81497
2000-06-30	76280
2000-09-30	82274
2000-12-31	78409
2001-03-31	86440
2001-06-30	88305
2001-09-30	90586
2001-12-31	91812
2002-03-31	98330
2002-06-30	101918
2002-09-30	109625
2002-12-31	117587
2003-03-31	111229
2003-06-30	129463
2003-09-30	156966
2003-12-31	169448
2004-03-31	159013
2004-06-30	175349
2004-09-30	183345
2004-12-31	213601
2005-03-31	232573
2005-06-30	247860
2005-09-30	241967
2005-12-31	258357
2006-03-31	267106
2006-06-30	308937
2006-09-30	283899
2006-12-31	306839
2007-03-31	328350
2007-06-30	349100
2007-09-30	389848
2007-12-31	410536
2008-03-31	435011
2008-06-30	420006
2008-09-30	439863
2008-12-31	346901
2009-03-31	319641
2009-06-30	318085
2009-09-30	297092
2009-12-31	330751
2010-03-31	322781
2010-06-30	290904
2010-09-30	320432
2010-12-31	325822
2011-03-31	326878
2011-06-30	333342
2011-09-30	287159
2011-12-31	267100
2012-03-31	280905
2012-06-30	264384
2012-09-30	262305
2012-12-31	251739
2013-03-31	267147
2013-06-30	268540
2013-09-30	265515
2013-12-31	260318
2014-03-31	245815
2014-06-30	260063
2014-09-30	274665
2014-12-31	271519
2015-03-31	267049
2015-06-30	262052
2015-09-30	268723
2015-12-31	248900
2016-03-31	257475
2016-06-30	270329
2016-09-30	257767
2016-12-31	270526
2017-03-31	260441
2017-06-30	250077
2017-09-30	270188
2017-12-31	299824
2018-03-31	292561
2018-06-30	286606
2018-09-30	272468
2018-12-31	294847
2019-03-31	267829
2019-06-30	269871
2019-09-30	250661
2019-12-31	269435
2020-03-31	278883
2020-06-30	257223
2020-09-30	247642
2020-12-31	260521
2021-03-31	275233
2021-06-30	303556
2021-09-30	309366
2021-12-31	338578
2022-03-31	337457
2022-06-30	339552
2022-09-30	304619
2022-12-31	294478
2023-03-31	301782
2023-06-30	295319
2023-09-30	289667