Quarter	US dollars
2004-12-31	2148
2005-03-31	2503
2005-06-30	2533
2005-09-30	2835
2005-12-31	2645
2006-03-31	2779
2006-06-30	3055
2006-09-30	3118
2006-12-31	3260
2007-03-31	3103
2007-06-30	3339
2007-09-30	3453
2007-12-31	3617
2008-03-31	4217
2008-06-30	4997
2008-09-30	5020
2008-12-31	4786
2009-03-31	4210
2009-06-30	5049
2009-09-30	4558
2009-12-31	4008
2010-03-31	4811
2010-06-30	5783
2010-09-30	7249
2010-12-31	7485
2011-03-31	8675
2011-06-30	10205
2011-09-30	10044
2011-12-31	9994
2012-03-31	11316
2012-06-30	12106
2012-09-30	12469
2012-12-31	13558
2013-03-31	12696
2013-06-30	13142
2013-09-30	13172
2013-12-31	13540
2014-03-31	13520
2014-06-30	14081
2014-09-30	13425
2014-12-31	13359
2015-03-31	13092
2015-06-30	13333
2015-09-30	12363
2015-12-31	11762
2016-03-31	11695
2016-06-30	11525
2016-09-30	10797
2016-12-31	10114
2017-03-31	10701
2017-06-30	11058
2017-09-30	10623
2017-12-31	10141
2018-03-31	9166
2018-06-30	8905
2018-09-30	8837
2018-12-31	9480
2019-03-31	9217
2019-06-30	9517
2019-09-30	9185
2019-12-31	9269
2020-03-31	8347
2020-06-30	7955
2020-09-30	7402
2020-12-31	7381
2021-03-31	6770
2021-06-30	7430
2021-09-30	7256
2021-12-31	7167
2022-03-31	6873
2022-06-30	7086
2022-09-30	7641
2022-12-31	6613
2023-03-31	6144
2023-06-30	6441
2023-09-30	6475