Quarter	US dollars
1999-03-31	457
1999-06-30	530
1999-09-30	695
1999-12-31	670
2000-03-31	640
2000-06-30	670
2000-09-30	635
2000-12-31	514
2001-03-31	502
2001-06-30	484
2001-09-30	526
2001-12-31	545
2002-03-31	534
2002-06-30	575
2002-09-30	469
2002-12-31	459
2003-03-31	450
2003-06-30	465
2003-09-30	495
2003-12-31	557
2004-03-31	560
2004-06-30	588
2004-09-30	547
2004-12-31	643
2005-03-31	653
2005-06-30	620
2005-09-30	609
2005-12-31	657
2006-03-31	682
2006-06-30	595
2006-09-30	564
2006-12-31	547
2007-03-31	520
2007-06-30	598
2007-09-30	454
2007-12-31	456
2008-03-31	448
2008-06-30	356
2008-09-30	253
2008-12-31	213
2009-03-31	153
2009-06-30	151
2009-09-30	177
2009-12-31	191
2010-03-31	174
2010-06-30	150
2010-09-30	200
2010-12-31	189
2011-03-31	199
2011-06-30	258
2011-09-30	172
2011-12-31	691
2012-03-31	154
2012-06-30	232
2012-09-30	328
2012-12-31	478
2013-03-31	237
2013-06-30	316
2013-09-30	317
2013-12-31	306
2014-03-31	422
2014-06-30	388
2014-09-30	529
2014-12-31	546
2015-03-31	484
2015-06-30	409
2015-09-30	408
2015-12-31	392
2016-03-31	434
2016-06-30	409
2016-09-30	400
2016-12-31	486
2017-03-31	354
2017-06-30	368
2017-09-30	436
2017-12-31	400
2018-03-31	275
2018-06-30	236
2018-09-30	230
2018-12-31	195
2019-03-31	199
2019-06-30	196
2019-09-30	171
2019-12-31	193
2020-03-31	141
2020-06-30	164
2020-09-30	199
2020-12-31	304
2021-03-31	288
2021-06-30	263
2021-09-30	326
2021-12-31	314
2022-03-31	216
2022-06-30	263
2022-09-30	224
2022-12-31	228
2023-03-31	334
2023-06-30	261
2023-09-30	232