Quarter	US dollars
1999-03-31	974
1999-06-30	727
1999-09-30	761
1999-12-31	740
2000-03-31	862
2000-06-30	942
2000-09-30	852
2000-12-31	536
2001-03-31	513
2001-06-30	494
2001-09-30	494
2001-12-31	483
2002-03-31	478
2002-06-30	496
2002-09-30	466
2002-12-31	467
2003-03-31	395
2003-06-30	453
2003-09-30	391
2003-12-31	298
2004-03-31	310
2004-06-30	330
2004-09-30	313
2004-12-31	192
2005-03-31	133
2005-06-30	378
2005-09-30	396
2005-12-31	442
2006-03-31	425
2006-06-30	426
2006-09-30	473
2006-12-31	393
2007-03-31	378
2007-06-30	457
2007-09-30	593
2007-12-31	1221
2008-03-31	1475
2008-06-30	1417
2008-09-30	1518
2008-12-31	1229
2009-03-31	484
2009-06-30	921
2009-09-30	833
2009-12-31	889
2010-03-31	753
2010-06-30	711
2010-09-30	789
2010-12-31	906
2011-03-31	919
2011-06-30	764
2011-09-30	347
2011-12-31	357
2012-03-31	439
2012-06-30	419
2012-09-30	377
2012-12-31	340
2013-03-31	331
2013-06-30	474
2013-09-30	319
2013-12-31	531
2014-03-31	739
2014-06-30	786
2014-09-30	662
2014-12-31	468
2015-03-31	548
2015-06-30	490
2015-09-30	468
2015-12-31	455
2016-03-31	601
2016-06-30	627
2016-09-30	446
2016-12-31	443
2017-03-31	357
2017-06-30	308
2017-09-30	253
2017-12-31	326
2018-03-31	387
2018-06-30	418
2018-09-30	394
2018-12-31	242
2019-03-31	305
2019-06-30	349
2019-09-30	384
2019-12-31	325
2020-03-31	286
2020-06-30	438
2020-09-30	311
2020-12-31	283
2021-03-31	237
2021-06-30	187
2021-09-30	249
2021-12-31	278
2022-03-31	231
2022-06-30	130
2022-09-30	156
2022-12-31	234
2023-03-31	196
2023-06-30	180
2023-09-30	128