Quarter	US dollars
2004-12-31	3669
2005-03-31	5074
2005-06-30	4906
2005-09-30	3651
2005-12-31	2590
2006-03-31	2711
2006-06-30	3921
2006-09-30	3678
2006-12-31	5368
2007-03-31	6100
2007-06-30	5674
2007-09-30	6047
2007-12-31	6586
2008-03-31	7155
2008-06-30	7417
2008-09-30	7718
2008-12-31	5736
2009-03-31	6102
2009-06-30	7389
2009-09-30	7131
2009-12-31	6454
2010-03-31	6508
2010-06-30	6030
2010-09-30	6212
2010-12-31	6282
2011-03-31	7072
2011-06-30	5913
2011-09-30	3910
2011-12-31	4277
2012-03-31	3803
2012-06-30	4391
2012-09-30	5281
2012-12-31	5507
2013-03-31	5122
2013-06-30	4964
2013-09-30	5260
2013-12-31	5790
2014-03-31	5772
2014-06-30	5493
2014-09-30	4397
2014-12-31	4842
2015-03-31	4586
2015-06-30	5629
2015-09-30	6030
2015-12-31	5645
2016-03-31	6710
2016-06-30	7542
2016-09-30	5810
2016-12-31	4246
2017-03-31	4130
2017-06-30	3844
2017-09-30	4205
2017-12-31	4249
2018-03-31	4013
2018-06-30	3743
2018-09-30	3508
2018-12-31	3252
2019-03-31	3295
2019-06-30	3312
2019-09-30	3418
2019-12-31	3597
2020-03-31	3768
2020-06-30	3653
2020-09-30	5025
2020-12-31	3445
2021-03-31	3576
2021-06-30	3590
2021-09-30	3403
2021-12-31	3260
2022-03-31	3108
2022-06-30	2741
2022-09-30	2306
2022-12-31	2688
2023-03-31	2903
2023-06-30	3268
2023-09-30	2882