Quarter	US dollars
2004-12-31	4685
2005-03-31	5333
2005-06-30	5723
2005-09-30	6514
2005-12-31	6880
2006-03-31	6680
2006-06-30	6874
2006-09-30	7335
2006-12-31	8024
2007-03-31	8416
2007-06-30	9197
2007-09-30	11687
2007-12-31	10637
2008-03-31	11714
2008-06-30	12398
2008-09-30	12738
2008-12-31	11610
2009-03-31	10222
2009-06-30	9774
2009-09-30	10583
2009-12-31	11257
2010-03-31	11877
2010-06-30	11844
2010-09-30	12037
2010-12-31	13393
2011-03-31	14283
2011-06-30	12604
2011-09-30	12507
2011-12-31	12578
2012-03-31	13042
2012-06-30	12412
2012-09-30	12918
2012-12-31	12305
2013-03-31	13265
2013-06-30	12983
2013-09-30	12576
2013-12-31	12829
2014-03-31	14077
2014-06-30	15274
2014-09-30	14978
2014-12-31	15274
2015-03-31	14837
2015-06-30	9963
2015-09-30	9371
2015-12-31	8690
2016-03-31	7275
2016-06-30	6496
2016-09-30	6919
2016-12-31	7822
2017-03-31	10501
2017-06-30	8581
2017-09-30	8978
2017-12-31	10530
2018-03-31	6288
2018-06-30	6166
2018-09-30	8590
2018-12-31	8416
2019-03-31	8674
2019-06-30	9318
2019-09-30	8782
2019-12-31	9472
2020-03-31	7860
2020-06-30	7604
2020-09-30	6711
2020-12-31	6631
2021-03-31	7290
2021-06-30	7299
2021-09-30	7384
2021-12-31	6624
2022-03-31	6065
2022-06-30	5475
2022-09-30	4664
2022-12-31	4388
2023-03-31	4617
2023-06-30	4866
2023-09-30	4280