Quarter	US dollars
2004-12-31	7388
2005-03-31	8032
2005-06-30	7806
2005-09-30	8359
2005-12-31	7403
2006-03-31	8031
2006-06-30	8073
2006-09-30	8347
2006-12-31	11026
2007-03-31	11589
2007-06-30	12514
2007-09-30	18190
2007-12-31	19477
2008-03-31	21244
2008-06-30	22068
2008-09-30	21054
2008-12-31	23056
2009-03-31	22488
2009-06-30	23213
2009-09-30	24834
2009-12-31	22783
2010-03-31	23659
2010-06-30	26269
2010-09-30	32389
2010-12-31	33917
2011-03-31	31501
2011-06-30	33316
2011-09-30	34177
2011-12-31	36103
2012-03-31	36192
2012-06-30	39689
2012-09-30	40345
2012-12-31	43718
2013-03-31	51145
2013-06-30	47511
2013-09-30	48339
2013-12-31	48678
2014-03-31	51501
2014-06-30	51460
2014-09-30	51008
2014-12-31	50909
2015-03-31	49472
2015-06-30	47085
2015-09-30	42045
2015-12-31	43227
2016-03-31	41200
2016-06-30	39446
2016-09-30	36323
2016-12-31	37149
2017-03-31	39154
2017-06-30	28903
2017-09-30	27151
2017-12-31	27228
2018-03-31	27307
2018-06-30	26776
2018-09-30	28278
2018-12-31	29859
2019-03-31	31134
2019-06-30	29512
2019-09-30	31352
2019-12-31	30362
2020-03-31	31579
2020-06-30	33703
2020-09-30	31298
2020-12-31	31398
2021-03-31	36664
2021-06-30	37827
2021-09-30	39054
2021-12-31	37033
2022-03-31	37733
2022-06-30	35269
2022-09-30	34736
2022-12-31	31884
2023-03-31	31032
2023-06-30	30826
2023-09-30	30588