Quarter	US dollars
2004-12-31	3700
2005-03-31	4416
2005-06-30	3994
2005-09-30	4059
2005-12-31	2159
2006-03-31	10841
2006-06-30	11371
2006-09-30	16606
2006-12-31	18096
2007-03-31	8365
2007-06-30	7887
2007-09-30	5254
2007-12-31	7117
2008-03-31	12201
2008-06-30	9093
2008-09-30	8310
2008-12-31	7491
2009-03-31	8971
2009-06-30	9105
2009-09-30	8495
2009-12-31	12251
2010-03-31	8484
2010-06-30	9300
2010-09-30	7889
2010-12-31	9611
2011-03-31	13359
2011-06-30	11048
2011-09-30	8821
2011-12-31	6807
2012-03-31	6672
2012-06-30	6058
2012-09-30	5026
2012-12-31	3458
2013-03-31	4231
2013-06-30	4235
2013-09-30	5080
2013-12-31	3682
2014-03-31	2871
2014-06-30	2689
2014-09-30	2012
2014-12-31	2129
2015-03-31	4227
2015-06-30	2668
2015-09-30	2513
2015-12-31	3408
2016-03-31	3382
2016-06-30	2993
2016-09-30	2396
2016-12-31	1871
2017-03-31	2241
2017-06-30	3627
2017-09-30	3657
2017-12-31	2676
2018-03-31	2614
2018-06-30	2487
2018-09-30	2582
2018-12-31	3079
2019-03-31	4549
2019-06-30	3815
2019-09-30	6017
2019-12-31	2637
2020-03-31	3697
2020-06-30	3834
2020-09-30	4637
2020-12-31	3550
2021-03-31	3205
2021-06-30	3185
2021-09-30	2639
2021-12-31	2875
2022-03-31	3556
2022-06-30	3026
2022-09-30	2693
2022-12-31	3349
2023-03-31	3910
2023-06-30	3157
2023-09-30	3681