Quarter	US dollars
2004-12-31	8532
2005-03-31	8851
2005-06-30	8615
2005-09-30	7769
2005-12-31	10847
2006-03-31	9942
2006-06-30	9682
2006-09-30	7357
2006-12-31	21196
2007-03-31	12580
2007-06-30	13499
2007-09-30	12931
2007-12-31	14386
2008-03-31	16653
2008-06-30	13835
2008-09-30	17183
2008-12-31	13571
2009-03-31	6320
2009-06-30	6959
2009-09-30	6821
2009-12-31	9183
2010-03-31	9667
2010-06-30	9045
2010-09-30	9713
2010-12-31	8112
2011-03-31	8922
2011-06-30	8834
2011-09-30	8283
2011-12-31	8709
2012-03-31	7578
2012-06-30	6974
2012-09-30	6408
2012-12-31	6553
2013-03-31	6810
2013-06-30	6865
2013-09-30	6683
2013-12-31	8166
2014-03-31	8238
2014-06-30	9114
2014-09-30	8314
2014-12-31	7635
2015-03-31	6795
2015-06-30	7100
2015-09-30	6583
2015-12-31	6591
2016-03-31	6236
2016-06-30	5317
2016-09-30	6175
2016-12-31	5383
2017-03-31	5622
2017-06-30	6187
2017-09-30	7318
2017-12-31	7745
2018-03-31	7881
2018-06-30	8595
2018-09-30	8132
2018-12-31	11470
2019-03-31	13392
2019-06-30	13518
2019-09-30	16301
2019-12-31	11559
2020-03-31	12641
2020-06-30	11438
2020-09-30	11060
2020-12-31	12079
2021-03-31	14057
2021-06-30	13049
2021-09-30	11394
2021-12-31	8782
2022-03-31	12000
2022-06-30	7401
2022-09-30	8469
2022-12-31	10629
2023-03-31	13609
2023-06-30	13627
2023-09-30	16906