Quarter	US dollars
1999-03-31	33323
1999-06-30	26265
1999-09-30	26157
1999-12-31	31513
2000-03-31	28827
2000-06-30	36775
2000-09-30	39309
2000-12-31	27997
2001-03-31	41012
2001-06-30	37607
2001-09-30	43846
2001-12-31	23769
2002-03-31	24542
2002-06-30	22162
2002-09-30	15520
2002-12-31	25214
2003-03-31	22718
2003-06-30	26791
2003-09-30	25700
2003-12-31	35774
2004-03-31	38038
2004-06-30	31580
2004-09-30	25699
2004-12-31	36972
2005-03-31	33327
2005-06-30	45680
2005-09-30	33386
2005-12-31	45826
2006-03-31	38229
2006-06-30	62465
2006-09-30	53656
2006-12-31	70143
2007-03-31	68715
2007-06-30	76265
2007-09-30	95306
2007-12-31	93961
2008-03-31	102872
2008-06-30	87109
2008-09-30	101022
2008-12-31	69920
2009-03-31	133727
2009-06-30	90976
2009-09-30	116283
2009-12-31	120422
2010-03-31	105272
2010-06-30	96020
2010-09-30	116283
2010-12-31	115804
2011-03-31	122974
2011-06-30	129508
2011-09-30	108612
2011-12-31	134160
2012-03-31	127487
2012-06-30	121421
2012-09-30	111469
2012-12-31	118051
2013-03-31	104547
2013-06-30	109584
2013-09-30	118493
2013-12-31	136550
2014-03-31	143727
2014-06-30	167948
2014-09-30	177703
2014-12-31	136578
2015-03-31	123606
2015-06-30	120713
2015-09-30	107052
2015-12-31	96420
2016-03-31	114325
2016-06-30	147647
2016-09-30	156251
2016-12-31	134565
2017-03-31	154384
2017-06-30	139874
2017-09-30	138473
2017-12-31	134189
2018-03-31	145550
2018-06-30	133993
2018-09-30	131244
2018-12-31	97918
2019-03-31	108507
2019-06-30	104256
2019-09-30	101017
2019-12-31	87854
2020-03-31	109966
2020-06-30	77739
2020-09-30	66765
2020-12-31	72815
2021-03-31	83502
2021-06-30	71415
2021-09-30	92776
2021-12-31	88231
2022-03-31	98351
2022-06-30	76758
2022-09-30	80771
2022-12-31	79972
2023-03-31	94225
2023-06-30	87024
2023-09-30	55567