Quarter	US dollars
2004-12-31	19013
2005-03-31	19524
2005-06-30	25511
2005-09-30	31370
2005-12-31	18205
2006-03-31	20420
2006-06-30	18738
2006-09-30	20763
2006-12-31	19725
2007-03-31	20201
2007-06-30	24428
2007-09-30	20610
2007-12-31	23369
2008-03-31	31637
2008-06-30	32279
2008-09-30	23820
2008-12-31	21383
2009-03-31	21653
2009-06-30	22480
2009-09-30	18792
2009-12-31	21425
2010-03-31	27630
2010-06-30	28802
2010-09-30	27129
2010-12-31	21106
2011-03-31	14974
2011-06-30	17980
2011-09-30	18978
2011-12-31	12887
2012-03-31	14525
2012-06-30	12266
2012-09-30	17157
2012-12-31	18391
2013-03-31	23008
2013-06-30	23864
2013-09-30	31373
2013-12-31	28147
2014-03-31	22547
2014-06-30	23869
2014-09-30	18034
2014-12-31	12407
2015-03-31	14794
2015-06-30	13313
2015-09-30	11036
2015-12-31	8789
2016-03-31	9858
2016-06-30	8112
2016-09-30	7719
2016-12-31	6492
2017-03-31	9485
2017-06-30	11071
2017-09-30	11833
2017-12-31	12647
2018-03-31	10109
2018-06-30	12118
2018-09-30	14065
2018-12-31	10883
2019-03-31	9241
2019-06-30	7585
2019-09-30	7778
2019-12-31	6499
2020-03-31	7276
2020-06-30	8158
2020-09-30	11063
2020-12-31	13533
2021-03-31	12120
2021-06-30	13216
2021-09-30	12733
2021-12-31	14209
2022-03-31	14403
2022-06-30	11312
2022-09-30	14453
2022-12-31	14046
2023-03-31	25400
2023-06-30	30208
2023-09-30	24892