Quarter	US dollars
2004-12-31	5719
2005-03-31	7204
2005-06-30	6571
2005-09-30	5246
2005-12-31	4194
2006-03-31	5542
2006-06-30	7070
2006-09-30	7402
2006-12-31	8746
2007-03-31	9102
2007-06-30	10435
2007-09-30	11475
2007-12-31	12276
2008-03-31	13523
2008-06-30	13232
2008-09-30	13106
2008-12-31	10254
2009-03-31	15698
2009-06-30	17785
2009-09-30	17895
2009-12-31	18089
2010-03-31	11809
2010-06-30	10987
2010-09-30	11441
2010-12-31	11193
2011-03-31	11745
2011-06-30	10253
2011-09-30	8333
2011-12-31	8313
2012-03-31	8425
2012-06-30	8779
2012-09-30	9720
2012-12-31	9466
2013-03-31	8243
2013-06-30	8051
2013-09-30	8607
2013-12-31	9707
2014-03-31	9874
2014-06-30	9108
2014-09-30	7331
2014-12-31	7785
2015-03-31	7446
2015-06-30	8978
2015-09-30	8929
2015-12-31	8845
2016-03-31	8758
2016-06-30	8568
2016-09-30	7897
2016-12-31	6092
2017-03-31	5113
2017-06-30	4892
2017-09-30	5311
2017-12-31	5303
2018-03-31	5201
2018-06-30	4724
2018-09-30	4369
2018-12-31	3910
2019-03-31	3896
2019-06-30	3704
2019-09-30	3750
2019-12-31	3929
2020-03-31	3980
2020-06-30	3946
2020-09-30	5295
2020-12-31	4052
2021-03-31	4219
2021-06-30	4260
2021-09-30	4034
2021-12-31	3964
2022-03-31	3709
2022-06-30	3349
2022-09-30	2929
2022-12-31	3348
2023-03-31	3541
2023-06-30	3879
2023-09-30	3711