Quarter	US dollars
1999-03-31	370
1999-06-30	149
1999-09-30	134
1999-12-31	275
2000-03-31	427
2000-06-30	244
2000-09-30	365
2000-12-31	442
2001-03-31	454
2001-06-30	781
2001-09-30	805
2001-12-31	897
2002-03-31	806
2002-06-30	288
2002-09-30	569
2002-12-31	346
2003-03-31	459
2003-06-30	326
2003-09-30	354
2003-12-31	696
2004-03-31	268
2004-06-30	272
2004-09-30	500
2004-12-31	848
2005-03-31	1090
2005-06-30	459
2005-09-30	244
2005-12-31	690
2006-03-31	494
2006-06-30	352
2006-09-30	1537
2006-12-31	1800
2007-03-31	1526
2007-06-30	1843
2007-09-30	1359
2007-12-31	955
2008-03-31	1018
2008-06-30	1153
2008-09-30	919
2008-12-31	741
2009-03-31	568
2009-06-30	519
2009-09-30	439
2009-12-31	341
2010-03-31	345
2010-06-30	349
2010-09-30	338
2010-12-31	442
2011-03-31	433
2011-06-30	303
2011-09-30	376
2011-12-31	232
2012-03-31	201
2012-06-30	303
2012-09-30	303
2012-12-31	412
2013-03-31	416
2013-06-30	223
2013-09-30	342
2013-12-31	247
2014-03-31	269
2014-06-30	228
2014-09-30	297
2014-12-31	218
2015-03-31	391
2015-06-30	436
2015-09-30	1184
2015-12-31	811
2016-03-31	894
2016-06-30	956
2016-09-30	534
2016-12-31	793
2017-03-31	615
2017-06-30	616
2017-09-30	590
2017-12-31	588
2018-03-31	220
2018-06-30	373
2018-09-30	136
2018-12-31	431
2019-03-31	885
2019-06-30	916
2019-09-30	429
2019-12-31	504
2020-03-31	838
2020-06-30	143
2020-09-30	157
2020-12-31	565
2021-03-31	318
2021-06-30	757
2021-09-30	851
2021-12-31	461
2022-03-31	560
2022-06-30	692
2022-09-30	637
2022-12-31	583
2023-03-31	537
2023-06-30	723
2023-09-30	548