Quarter	US dollars
2004-12-31	8559
2005-03-31	9271
2005-06-30	9947
2005-09-30	10510
2005-12-31	10313
2006-03-31	10750
2006-06-30	10468
2006-09-30	11304
2006-12-31	13816
2007-03-31	14427
2007-06-30	16051
2007-09-30	17106
2007-12-31	16875
2008-03-31	17476
2008-06-30	18858
2008-09-30	20407
2008-12-31	16913
2009-03-31	15357
2009-06-30	15531
2009-09-30	15600
2009-12-31	15491
2010-03-31	16074
2010-06-30	16413
2010-09-30	16807
2010-12-31	14589
2011-03-31	15240
2011-06-30	16017
2011-09-30	15486
2011-12-31	15673
2012-03-31	16556
2012-06-30	16781
2012-09-30	17531
2012-12-31	16852
2013-03-31	17233
2013-06-30	16929
2013-09-30	16992
2013-12-31	17941
2014-03-31	18227
2014-06-30	19314
2014-09-30	18996
2014-12-31	18751
2015-03-31	17692
2015-06-30	16635
2015-09-30	14985
2015-12-31	14672
2016-03-31	13728
2016-06-30	12277
2016-09-30	13309
2016-12-31	14637
2017-03-31	16642
2017-06-30	11818
2017-09-30	13062
2017-12-31	15277
2018-03-31	11581
2018-06-30	11027
2018-09-30	10833
2018-12-31	11133
2019-03-31	11694
2019-06-30	11305
2019-09-30	10859
2019-12-31	12058
2020-03-31	11916
2020-06-30	11233
2020-09-30	9118
2020-12-31	6307
2021-03-31	6824
2021-06-30	5523
2021-09-30	5647
2021-12-31	5949
2022-03-31	4957
2022-06-30	4833
2022-09-30	3944
2022-12-31	3986
2023-03-31	4537
2023-06-30	4650
2023-09-30	4348