Quarter	US dollars
2004-12-31	8380
2005-03-31	6684
2005-06-30	6177
2005-09-30	5552
2005-12-31	6365
2006-03-31	6041
2006-06-30	7198
2006-09-30	7908
2006-12-31	13245
2007-03-31	14402
2007-06-30	13477
2007-09-30	7434
2007-12-31	8877
2008-03-31	32464
2008-06-30	21216
2008-09-30	20927
2008-12-31	18611
2009-03-31	17002
2009-06-30	15035
2009-09-30	8542
2009-12-31	7365
2010-03-31	11522
2010-06-30	9335
2010-09-30	9480
2010-12-31	6647
2011-03-31	6085
2011-06-30	6018
2011-09-30	6116
2011-12-31	7098
2012-03-31	5012
2012-06-30	3573
2012-09-30	4733
2012-12-31	5268
2013-03-31	5568
2013-06-30	7182
2013-09-30	5827
2013-12-31	5167
2014-03-31	6723
2014-06-30	8991
2014-09-30	9570
2014-12-31	11594
2015-03-31	3569
2015-06-30	3967
2015-09-30	5304
2015-12-31	4865
2016-03-31	5705
2016-06-30	6900
2016-09-30	5320
2016-12-31	6164
2017-03-31	5952
2017-06-30	10671
2017-09-30	7890
2017-12-31	5996
2018-03-31	7666
2018-06-30	7505
2018-09-30	6877
2018-12-31	6857
2019-03-31	7513
2019-06-30	9224
2019-09-30	7656
2019-12-31	5913
2020-03-31	5723
2020-06-30	4799
2020-09-30	4716
2020-12-31	3820
2021-03-31	3253
2021-06-30	4095
2021-09-30	4370
2021-12-31	4442
2022-03-31	4912
2022-06-30	4262
2022-09-30	3631
2022-12-31	2635
2023-03-31	2762
2023-06-30	3728
2023-09-30	4189