Quarter	US dollars
1999-09-30	10
1999-12-31	24
2000-03-31	37
2000-06-30	32
2000-09-30	21
2000-12-31	97
2001-03-31	102
2001-06-30	105
2001-09-30	122
2001-12-31	100
2002-03-31	68
2002-06-30	139
2002-09-30	267
2002-12-31	301
2003-03-31	286
2003-06-30	327
2003-09-30	311
2003-12-31	306
2004-03-31	323
2004-06-30	221
2004-09-30	291
2004-12-31	351
2005-03-31	325
2005-06-30	333
2005-09-30	322
2005-12-31	448
2006-03-31	609
2006-06-30	618
2006-09-30	519
2006-12-31	552
2007-03-31	632
2007-06-30	758
2007-09-30	943
2007-12-31	1133
2008-03-31	1725
2008-06-30	1540
2008-09-30	1217
2008-12-31	966
2009-03-31	851
2009-06-30	619
2009-09-30	750
2009-12-31	610
2010-03-31	595
2010-06-30	622
2010-09-30	767
2010-12-31	709
2011-03-31	553
2011-06-30	568
2011-09-30	724
2011-12-31	623
2012-03-31	767
2012-06-30	731
2012-09-30	749
2012-12-31	585
2013-03-31	556
2013-06-30	400
2013-09-30	457
2013-12-31	428
2014-03-31	428
2014-06-30	448
2014-09-30	470
2014-12-31	573
2015-03-31	733
2015-06-30	499
2015-09-30	539
2015-12-31	446
2016-03-31	556
2016-06-30	584
2016-09-30	509
2016-12-31	357
2017-03-31	345
2017-06-30	375
2017-09-30	321
2017-12-31	288
2018-03-31	321
2018-06-30	218
2018-09-30	226
2018-12-31	250
2019-03-31	465
2019-06-30	781
2019-09-30	1019
2019-12-31	785
2020-03-31	1967
2020-06-30	2027
2020-09-30	2011
2020-12-31	1897
2021-03-31	1171
2021-06-30	1267
2021-09-30	1041
2021-12-31	806
2022-03-31	161
2022-06-30	98
2022-09-30	131
2022-12-31	41
2023-03-31	53
2023-06-30	49
2023-09-30	55