Quarter	US dollars
2004-12-31	11022
2005-03-31	11658
2005-06-30	11965
2005-09-30	12290
2005-12-31	12420
2006-03-31	13392
2006-06-30	14166
2006-09-30	15642
2006-12-31	16282
2007-03-31	18607
2007-06-30	21348
2007-09-30	26700
2007-12-31	28902
2008-03-31	37188
2008-06-30	35995
2008-09-30	31105
2008-12-31	24422
2009-03-31	26045
2009-06-30	23482
2009-09-30	23497
2009-12-31	23608
2010-03-31	22754
2010-06-30	24644
2010-09-30	25671
2010-12-31	26837
2011-03-31	30186
2011-06-30	40543
2011-09-30	44244
2011-12-31	38982
2012-03-31	36569
2012-06-30	36592
2012-09-30	36377
2012-12-31	39314
2013-03-31	41859
2013-06-30	41576
2013-09-30	44057
2013-12-31	44551
2014-03-31	44392
2014-06-30	46967
2014-09-30	46540
2014-12-31	46566
2015-03-31	42329
2015-06-30	43119
2015-09-30	36827
2015-12-31	31640
2016-03-31	32601
2016-06-30	29968
2016-09-30	29125
2016-12-31	29515
2017-03-31	28649
2017-06-30	35189
2017-09-30	34800
2017-12-31	35797
2018-03-31	35840
2018-06-30	36538
2018-09-30	33488
2018-12-31	33005
2019-03-31	34549
2019-06-30	35007
2019-09-30	32869
2019-12-31	31106
2020-03-31	31576
2020-06-30	31518
2020-09-30	29957
2020-12-31	28612
2021-03-31	32589
2021-06-30	32356
2021-09-30	32874
2021-12-31	32167
2022-03-31	35702
2022-06-30	32556
2022-09-30	33397
2022-12-31	35045
2023-03-31	31378
2023-06-30	31446
2023-09-30	32194