Quarter	US dollars
1999-03-31	328
1999-06-30	445
1999-09-30	582
1999-12-31	622
2000-03-31	813
2000-06-30	1039
2000-09-30	1059
2000-12-31	977
2001-03-31	993
2001-06-30	1022
2001-09-30	1347
2001-12-31	1222
2002-03-31	1090
2002-06-30	1252
2002-09-30	1098
2002-12-31	1150
2003-03-31	1122
2003-06-30	915
2003-09-30	906
2003-12-31	960
2004-03-31	974
2004-06-30	908
2004-09-30	698
2004-12-31	720
2005-03-31	615
2005-06-30	793
2005-09-30	561
2005-12-31	612
2006-03-31	951
2006-06-30	1044
2006-09-30	964
2006-12-31	1902
2007-03-31	2192
2007-06-30	2131
2007-09-30	2088
2007-12-31	2614
2008-03-31	2928
2008-06-30	2870
2008-09-30	1612
2008-12-31	658
2009-03-31	635
2009-06-30	670
2009-09-30	753
2009-12-31	556
2010-03-31	744
2010-06-30	884
2010-09-30	728
2010-12-31	874
2011-03-31	708
2011-06-30	839
2011-09-30	834
2011-12-31	503
2012-03-31	535
2012-06-30	865
2012-09-30	809
2012-12-31	594
2013-03-31	869
2013-06-30	1078
2013-09-30	762
2013-12-31	613
2014-03-31	1003
2014-06-30	979
2014-09-30	972
2014-12-31	741
2015-03-31	871
2015-06-30	759
2015-09-30	679
2015-12-31	694
2016-03-31	653
2016-06-30	754
2016-09-30	756
2016-12-31	708
2017-03-31	569
2017-06-30	744
2017-09-30	720
2017-12-31	712
2018-03-31	718
2018-06-30	709
2018-09-30	624
2018-12-31	632
2019-03-31	624
2019-06-30	637
2019-09-30	702
2019-12-31	632
2020-03-31	438
2020-06-30	342
2020-09-30	362
2020-12-31	298
2021-03-31	316
2021-06-30	218
2021-09-30	203
2021-12-31	213
2022-03-31	183
2022-06-30	193
2022-09-30	273
2022-12-31	261
2023-03-31	303
2023-06-30	298
2023-09-30	325