Quarter	US dollars
1999-03-31	447
1999-06-30	470
1999-09-30	482
1999-12-31	425
2000-03-31	493
2000-06-30	462
2000-09-30	491
2000-12-31	627
2001-03-31	509
2001-06-30	217
2001-09-30	667
2001-12-31	590
2002-03-31	230
2002-06-30	419
2002-09-30	417
2002-12-31	685
2003-03-31	866
2003-06-30	960
2003-09-30	656
2003-12-31	793
2004-03-31	450
2004-06-30	512
2004-09-30	334
2004-12-31	102
2005-03-31	300
2005-06-30	407
2005-09-30	345
2005-12-31	282
2006-03-31	421
2006-06-30	322
2006-09-30	314
2006-12-31	333
2007-03-31	344
2007-06-30	342
2007-09-30	396
2007-12-31	432
2008-03-31	484
2008-06-30	481
2008-09-30	522
2008-12-31	840
2009-03-31	769
2009-06-30	543
2009-09-30	879
2009-12-31	385
2010-03-31	686
2010-06-30	433
2010-09-30	298
2010-12-31	185
2011-03-31	240
2011-06-30	571
2011-09-30	1126
2011-12-31	1024
2012-03-31	787
2012-06-30	543
2012-09-30	478
2012-12-31	434
2013-03-31	396
2013-06-30	386
2013-09-30	411
2013-12-31	410
2014-03-31	8
2014-06-30	27
2014-09-30	9
2014-12-31	23
2015-03-31	8
2015-06-30	19
2015-09-30	17
2015-12-31	37
2016-03-31	30
2016-06-30	27
2016-09-30	39
2016-12-31	95
2017-03-31	79
2017-06-30	151
2017-09-30	203
2017-12-31	275
2018-03-31	181
2018-06-30	132
2018-09-30	144
2018-12-31	169
2019-03-31	174
2019-06-30	146
2019-09-30	134
2019-12-31	167
2020-03-31	51
2020-06-30	36
2020-09-30	120
2020-12-31	188
2021-03-31	99
2021-06-30	139
2021-09-30	278
2021-12-31	248
2022-03-31	187
2022-06-30	264
2022-09-30	351
2022-12-31	209
2023-03-31	346
2023-06-30	129
2023-09-30	288