Quarter	US dollars
2004-12-31	11460
2005-03-31	14278
2005-06-30	11020
2005-09-30	13508
2005-12-31	10351
2006-03-31	14497
2006-06-30	11797
2006-09-30	12493
2006-12-31	14024
2007-03-31	17469
2007-06-30	15166
2007-09-30	15244
2007-12-31	13046
2008-03-31	15264
2008-06-30	15915
2008-09-30	13223
2008-12-31	12487
2009-03-31	8110
2009-06-30	7271
2009-09-30	6939
2009-12-31	5645
2010-03-31	7406
2010-06-30	8805
2010-09-30	10115
2010-12-31	6373
2011-03-31	7592
2011-06-30	7330
2011-09-30	9207
2011-12-31	7157
2012-03-31	7915
2012-06-30	9313
2012-09-30	8362
2012-12-31	7819
2013-03-31	7446
2013-06-30	8450
2013-09-30	8369
2013-12-31	7446
2014-03-31	7528
2014-06-30	8986
2014-09-30	6786
2014-12-31	6679
2015-03-31	5676
2015-06-30	6163
2015-09-30	5214
2015-12-31	6064
2016-03-31	5807
2016-06-30	6012
2016-09-30	6346
2016-12-31	4742
2017-03-31	6165
2017-06-30	6602
2017-09-30	7748
2017-12-31	5969
2018-03-31	8929
2018-06-30	7264
2018-09-30	5156
2018-12-31	4555
2019-03-31	4815
2019-06-30	6331
2019-09-30	5931
2019-12-31	4999
2020-03-31	5940
2020-06-30	6036
2020-09-30	5398
2020-12-31	5484
2021-03-31	7047
2021-06-30	7173
2021-09-30	7126
2021-12-31	5469
2022-03-31	6906
2022-06-30	7467
2022-09-30	6589
2022-12-31	5706
2023-03-31	6681
2023-06-30	5613
2023-09-30	6662