Quarter	US dollars
1999-09-30	18742
1999-12-31	19028
2000-03-31	20138
2000-06-30	26220
2000-09-30	29102
2000-12-31	33196
2001-03-31	42174
2001-06-30	35019
2001-09-30	49475
2001-12-31	52428
2002-03-31	40000
2002-06-30	65847
2002-09-30	105490
2002-12-31	111441
2003-03-31	114878
2003-06-30	136629
2003-09-30	120384
2003-12-31	112827
2004-03-31	126354
2004-06-30	93578
2004-09-30	113377
2004-12-31	98376
2005-03-31	100615
2005-06-30	130241
2005-09-30	127186
2005-12-31	115101
2006-03-31	132778
2006-06-30	165174
2006-09-30	124658
2006-12-31	112113
2007-03-31	148253
2007-06-30	203485
2007-09-30	233107
2007-12-31	338634
2008-03-31	558229
2008-06-30	579911
2008-09-30	541001
2008-12-31	1068646
2009-03-31	727909
2009-06-30	444104
2009-09-30	428208
2009-12-31	333237
2010-03-31	329846
2010-06-30	349439
2010-09-30	394694
2010-12-31	340196
2011-03-31	259667
2011-06-30	279370
2011-09-30	407087
2011-12-31	366774
2012-03-31	335558
2012-06-30	320714
2012-09-30	256827
2012-12-31	247658
2013-03-31	224413
2013-06-30	190601
2013-09-30	161014
2013-12-31	146788
2014-03-31	40084
2014-06-30	191686
2014-09-30	188623
2014-12-31	254863
2015-03-31	275504
2015-06-30	207873
2015-09-30	226346
2015-12-31	194127
2016-03-31	243772
2016-06-30	262822
2016-09-30	229589
2016-12-31	168482
2017-03-31	122065
2017-06-30	119878
2017-09-30	119357
2017-12-31	115878
2018-03-31	108046
2018-06-30	101882
2018-09-30	100124
2018-12-31	96669
2019-03-31	98186
2019-06-30	113544
2019-09-30	126411
2019-12-31	110747
2020-03-31	172714
2020-06-30	141891
2020-09-30	144287
2020-12-31	158136
2021-03-31	141056
2021-06-30	127918
2021-09-30	125907
2021-12-31	132914
2022-03-31	144991
2022-06-30	159813
2022-09-30	176230
2022-12-31	130044
2023-03-31	115465
2023-06-30	119473
2023-09-30	122594