Quarter	US dollars
2004-12-31	21274
2005-03-31	23579
2005-06-30	23453
2005-09-30	24901
2005-12-31	22487
2006-03-31	23461
2006-06-30	25087
2006-09-30	25456
2006-12-31	25427
2007-03-31	27898
2007-06-30	30132
2007-09-30	27831
2007-12-31	30126
2008-03-31	33764
2008-06-30	34067
2008-09-30	31345
2008-12-31	29116
2009-03-31	28308
2009-06-30	29162
2009-09-30	29523
2009-12-31	30877
2010-03-31	33395
2010-06-30	33316
2010-09-30	37992
2010-12-31	39236
2011-03-31	42611
2011-06-30	45557
2011-09-30	41862
2011-12-31	44696
2012-03-31	45889
2012-06-30	45627
2012-09-30	47226
2012-12-31	50978
2013-03-31	51345
2013-06-30	53182
2013-09-30	53081
2013-12-31	53830
2014-03-31	55206
2014-06-30	55883
2014-09-30	55696
2014-12-31	50976
2015-03-31	48622
2015-06-30	43661
2015-09-30	38008
2015-12-31	37691
2016-03-31	41663
2016-06-30	40432
2016-09-30	37602
2016-12-31	34431
2017-03-31	34315
2017-06-30	34755
2017-09-30	35353
2017-12-31	35396
2018-03-31	39085
2018-06-30	37574
2018-09-30	35791
2018-12-31	37389
2019-03-31	39291
2019-06-30	37343
2019-09-30	36742
2019-12-31	36898
2020-03-31	36593
2020-06-30	34924
2020-09-30	37521
2020-12-31	38680
2021-03-31	38717
2021-06-30	38994
2021-09-30	38057
2021-12-31	38455
2022-03-31	38920
2022-06-30	36986
2022-09-30	36460
2022-12-31	36469
2023-03-31	37608
2023-06-30	35975
2023-09-30	36542