Quarter	US dollars
2004-12-31	5583
2005-03-31	5798
2005-06-30	5533
2005-09-30	5828
2005-12-31	5467
2006-03-31	5844
2006-06-30	6776
2006-09-30	7420
2006-12-31	5648
2007-03-31	6916
2007-06-30	8190
2007-09-30	5800
2007-12-31	7997
2008-03-31	8956
2008-06-30	8585
2008-09-30	11195
2008-12-31	9422
2009-03-31	10377
2009-06-30	12376
2009-09-30	14189
2009-12-31	15294
2010-03-31	16655
2010-06-30	16045
2010-09-30	18988
2010-12-31	18808
2011-03-31	19815
2011-06-30	22249
2011-09-30	21328
2011-12-31	19515
2012-03-31	17712
2012-06-30	19846
2012-09-30	21985
2012-12-31	21319
2013-03-31	25082
2013-06-30	18836
2013-09-30	21789
2013-12-31	22161
2014-03-31	18984
2014-06-30	19140
2014-09-30	18665
2014-12-31	19535
2015-03-31	13536
2015-06-30	15106
2015-09-30	20171
2015-12-31	20757
2016-03-31	21937
2016-06-30	20502
2016-09-30	21989
2016-12-31	22425
2017-03-31	20880
2017-06-30	21860
2017-09-30	21141
2017-12-31	21961
2018-03-31	22058
2018-06-30	23459
2018-09-30	25435
2018-12-31	25705
2019-03-31	25704
2019-06-30	28013
2019-09-30	28183
2019-12-31	27763
2020-03-31	29932
2020-06-30	37343
2020-09-30	40117
2020-12-31	43569
2021-03-31	37815
2021-06-30	37396
2021-09-30	39535
2021-12-31	39035
2022-03-31	36581
2022-06-30	35412
2022-09-30	29687
2022-12-31	35142
2023-03-31	33418
2023-06-30	33134
2023-09-30	35297