Quarter	US dollars
2004-12-31	4548
2005-03-31	3758
2005-06-30	4539
2005-09-30	4473
2005-12-31	5043
2006-03-31	5746
2006-06-30	6392
2006-09-30	4560
2006-12-31	5914
2007-03-31	7288
2007-06-30	9922
2007-09-30	7198
2007-12-31	6134
2008-03-31	6599
2008-06-30	5923
2008-09-30	4890
2008-12-31	3968
2009-03-31	4579
2009-06-30	4203
2009-09-30	4520
2009-12-31	4856
2010-03-31	5621
2010-06-30	7077
2010-09-30	7577
2010-12-31	6660
2011-03-31	6550
2011-06-30	6573
2011-09-30	6911
2011-12-31	6412
2012-03-31	3418
2012-06-30	3349
2012-09-30	5665
2012-12-31	5303
2013-03-31	5023
2013-06-30	4875
2013-09-30	5318
2013-12-31	5305
2014-03-31	5645
2014-06-30	6088
2014-09-30	6052
2014-12-31	5881
2015-03-31	5513
2015-06-30	5508
2015-09-30	4959
2015-12-31	4890
2016-03-31	5111
2016-06-30	4483
2016-09-30	5126
2016-12-31	4243
2017-03-31	4352
2017-06-30	5027
2017-09-30	4779
2017-12-31	4720
2018-03-31	4886
2018-06-30	5132
2018-09-30	4615
2018-12-31	4885
2019-03-31	7087
2019-06-30	7083
2019-09-30	6829
2019-12-31	6839
2020-03-31	6727
2020-06-30	7394
2020-09-30	7400
2020-12-31	7418
2021-03-31	7363
2021-06-30	7189
2021-09-30	9090
2021-12-31	7395
2022-03-31	7456
2022-06-30	6845
2022-09-30	6313
2022-12-31	7160
2023-03-31	9003
2023-06-30	7876
2023-09-30	7670