Quarter	US dollars
2004-12-31	13910
2005-03-31	9265
2005-06-30	9011
2005-09-30	6859
2005-12-31	6559
2006-03-31	7764
2006-06-30	8446
2006-09-30	8248
2006-12-31	7390
2007-03-31	7833
2007-06-30	7925
2007-09-30	7712
2007-12-31	8798
2008-03-31	9856
2008-06-30	7290
2008-09-30	7627
2008-12-31	4758
2009-03-31	4893
2009-06-30	5652
2009-09-30	5580
2009-12-31	5062
2010-03-31	5948
2010-06-30	4993
2010-09-30	5459
2010-12-31	5805
2011-03-31	5583
2011-06-30	4993
2011-09-30	4632
2011-12-31	4839
2012-03-31	4296
2012-06-30	4376
2012-09-30	4144
2012-12-31	4441
2013-03-31	3367
2013-06-30	5750
2013-09-30	5122
2013-12-31	5682
2014-03-31	8880
2014-06-30	7637
2014-09-30	6097
2014-12-31	7000
2015-03-31	5541
2015-06-30	6427
2015-09-30	5517
2015-12-31	5150
2016-03-31	5068
2016-06-30	4515
2016-09-30	4487
2016-12-31	8233
2017-03-31	7234
2017-06-30	7068
2017-09-30	6735
2017-12-31	7883
2018-03-31	7568
2018-06-30	6873
2018-09-30	7184
2018-12-31	8279
2019-03-31	7383
2019-06-30	7177
2019-09-30	3553
2019-12-31	3531
2020-03-31	3655
2020-06-30	3318
2020-09-30	2397
2020-12-31	3950
2021-03-31	2718
2021-06-30	3270
2021-09-30	5491
2021-12-31	5323
2022-03-31	4471
2022-06-30	5841
2022-09-30	5916
2022-12-31	4567
2023-03-31	4324
2023-06-30	4267
2023-09-30	4235