Quarter	US dollars
2004-12-31	5009
2005-03-31	6301
2005-06-30	5698
2005-09-30	4178
2005-12-31	3122
2006-03-31	4439
2006-06-30	5798
2006-09-30	6356
2006-12-31	7908
2007-03-31	8237
2007-06-30	9177
2007-09-30	9989
2007-12-31	10803
2008-03-31	11551
2008-06-30	12185
2008-09-30	12261
2008-12-31	9398
2009-03-31	15101
2009-06-30	17071
2009-09-30	16857
2009-12-31	16232
2010-03-31	10195
2010-06-30	9787
2010-09-30	10286
2010-12-31	10154
2011-03-31	10926
2011-06-30	9738
2011-09-30	8103
2011-12-31	8029
2012-03-31	7912
2012-06-30	8320
2012-09-30	9302
2012-12-31	9227
2013-03-31	8380
2013-06-30	8172
2013-09-30	8455
2013-12-31	10029
2014-03-31	10614
2014-06-30	9856
2014-09-30	8239
2014-12-31	9140
2015-03-31	8464
2015-06-30	9883
2015-09-30	10162
2015-12-31	10068
2016-03-31	9797
2016-06-30	10479
2016-09-30	8626
2016-12-31	6887
2017-03-31	5707
2017-06-30	5427
2017-09-30	5840
2017-12-31	5897
2018-03-31	5801
2018-06-30	5279
2018-09-30	4971
2018-12-31	4555
2019-03-31	4575
2019-06-30	4340
2019-09-30	4419
2019-12-31	4682
2020-03-31	4783
2020-06-30	4638
2020-09-30	6030
2020-12-31	4658
2021-03-31	4910
2021-06-30	4906
2021-09-30	4694
2021-12-31	4495
2022-03-31	4301
2022-06-30	3901
2022-09-30	3389
2022-12-31	3837
2023-03-31	4007
2023-06-30	4344
2023-09-30	4000