Quarter	US dollars
2004-12-31	4064
2005-03-31	4333
2005-06-30	4094
2005-09-30	4532
2005-12-31	5198
2006-03-31	5332
2006-06-30	6567
2006-09-30	6763
2006-12-31	7401
2007-03-31	8483
2007-06-30	10146
2007-09-30	10352
2007-12-31	11330
2008-03-31	15640
2008-06-30	17704
2008-09-30	16982
2008-12-31	15286
2009-03-31	14923
2009-06-30	15696
2009-09-30	15953
2009-12-31	17022
2010-03-31	15895
2010-06-30	14530
2010-09-30	16596
2010-12-31	17609
2011-03-31	19507
2011-06-30	19738
2011-09-30	18547
2011-12-31	16706
2012-03-31	16337
2012-06-30	15060
2012-09-30	14397
2012-12-31	14115
2013-03-31	12992
2013-06-30	12510
2013-09-30	12772
2013-12-31	12366
2014-03-31	12085
2014-06-30	11405
2014-09-30	9894
2014-12-31	9320
2015-03-31	7841
2015-06-30	7998
2015-09-30	7669
2015-12-31	7289
2016-03-31	7469
2016-06-30	2004
2016-09-30	1942
2016-12-31	966
2017-03-31	902
2017-06-30	860
2017-09-30	625
2017-12-31	580
2018-03-31	554
2018-06-30	981
2018-09-30	983
2018-12-31	833
2019-03-31	665
2019-06-30	803
2019-09-30	538
2019-12-31	556
2020-03-31	537
2020-06-30	561
2020-09-30	450
2020-12-31	332
2021-03-31	297
2021-06-30	510
2021-09-30	519
2021-12-31	687
2022-03-31	623
2022-06-30	590
2022-09-30	596
2022-12-31	439
2023-03-31	479
2023-06-30	361
2023-09-30	469