Quarter	US dollars
2004-12-31	6841
2005-03-31	6149
2005-06-30	6123
2005-09-30	6470
2005-12-31	6193
2006-03-31	6695
2006-06-30	6687
2006-09-30	6798
2006-12-31	6781
2007-03-31	7359
2007-06-30	8317
2007-09-30	8938
2007-12-31	8814
2008-03-31	9045
2008-06-30	9145
2008-09-30	7807
2008-12-31	6787
2009-03-31	6427
2009-06-30	7465
2009-09-30	7218
2009-12-31	7250
2010-03-31	6270
2010-06-30	6197
2010-09-30	6814
2010-12-31	7436
2011-03-31	6641
2011-06-30	7005
2011-09-30	6618
2011-12-31	5753
2012-03-31	5737
2012-06-30	5923
2012-09-30	5386
2012-12-31	5337
2013-03-31	5473
2013-06-30	5152
2013-09-30	4818
2013-12-31	5271
2014-03-31	4872
2014-06-30	5209
2014-09-30	4513
2014-12-31	4785
2015-03-31	5107
2015-06-30	4747
2015-09-30	4605
2015-12-31	4265
2016-03-31	4427
2016-06-30	4462
2016-09-30	4100
2016-12-31	3627
2017-03-31	3601
2017-06-30	3766
2017-09-30	3785
2017-12-31	4380
2018-03-31	4840
2018-06-30	4406
2018-09-30	4024
2018-12-31	3759
2019-03-31	3973
2019-06-30	4375
2019-09-30	6925
2019-12-31	7320
2020-03-31	6327
2020-06-30	6886
2020-09-30	6173
2020-12-31	7372
2021-03-31	6837
2021-06-30	6335
2021-09-30	5798
2021-12-31	6195
2022-03-31	6181
2022-06-30	5647
2022-09-30	7153
2022-12-31	6572
2023-03-31	6129
2023-06-30	5497
2023-09-30	5390