Quarter	US dollars
1999-03-31	567
1999-06-30	473
1999-09-30	485
1999-12-31	358
2000-03-31	322
2000-06-30	388
2000-09-30	533
2000-12-31	600
2001-03-31	591
2001-06-30	686
2001-09-30	655
2001-12-31	668
2002-03-31	526
2002-06-30	495
2002-09-30	395
2002-12-31	305
2003-03-31	323
2003-06-30	276
2003-09-30	239
2003-12-31	285
2004-03-31	81
2004-06-30	48
2004-09-30	76
2004-12-31	133
2005-03-31	84
2005-06-30	59
2005-09-30	185
2005-12-31	309
2006-03-31	226
2006-06-30	260
2006-09-30	197
2006-12-31	166
2007-03-31	256
2007-06-30	140
2007-09-30	159
2007-12-31	198
2008-03-31	89
2008-06-30	91
2008-09-30	376
2008-12-31	386
2009-03-31	211
2009-06-30	141
2009-09-30	74
2009-12-31	44
2010-03-31	116
2010-06-30	292
2010-09-30	528
2010-12-31	499
2011-03-31	500
2011-06-30	589
2011-09-30	755
2011-12-31	825
2012-03-31	581
2012-06-30	586
2012-09-30	285
2012-12-31	401
2013-03-31	543
2013-06-30	511
2013-09-30	492
2013-12-31	579
2014-03-31	606
2014-06-30	736
2014-09-30	665
2014-12-31	941
2015-03-31	897
2015-06-30	701
2015-09-30	727
2015-12-31	726
2016-03-31	671
2016-06-30	602
2016-09-30	579
2016-12-31	555
2017-03-31	482
2017-06-30	233
2017-09-30	375
2017-12-31	755
2018-03-31	438
2018-06-30	326
2018-09-30	403
2018-12-31	381
2019-03-31	113
2019-06-30	112
2019-09-30	110
2019-12-31	122
2020-03-31	363
2020-06-30	450
2020-09-30	250
2020-12-31	179
2021-03-31	276
2021-06-30	498
2021-09-30	293
2021-12-31	738
2022-03-31	424
2022-06-30	432
2022-09-30	824
2022-12-31	818
2023-03-31	435
2023-06-30	334
2023-09-30	605