Quarter	US dollars
2004-12-31	11890
2005-03-31	11582
2005-06-30	10056
2005-09-30	9927
2005-12-31	8259
2006-03-31	6525
2006-06-30	7727
2006-09-30	7099
2006-12-31	6777
2007-03-31	9238
2007-06-30	9809
2007-09-30	8824
2007-12-31	9435
2008-03-31	9317
2008-06-30	10086
2008-09-30	9299
2008-12-31	7859
2009-03-31	7253
2009-06-30	7694
2009-09-30	7933
2009-12-31	7900
2010-03-31	8381
2010-06-30	8536
2010-09-30	8717
2010-12-31	10882
2011-03-31	10773
2011-06-30	11215
2011-09-30	10011
2011-12-31	10070
2012-03-31	9956
2012-06-30	10831
2012-09-30	11243
2012-12-31	14844
2013-03-31	14568
2013-06-30	14663
2013-09-30	15020
2013-12-31	14950
2014-03-31	9530
2014-06-30	9190
2014-09-30	9505
2014-12-31	9398
2015-03-31	9443
2015-06-30	9785
2015-09-30	8261
2015-12-31	8383
2016-03-31	8861
2016-06-30	8975
2016-09-30	8235
2016-12-31	7479
2017-03-31	8601
2017-06-30	9814
2017-09-30	9638
2017-12-31	8576
2018-03-31	8967
2018-06-30	9890
2018-09-30	8603
2018-12-31	8406
2019-03-31	9384
2019-06-30	9760
2019-09-30	9387
2019-12-31	9869
2020-03-31	10303
2020-06-30	11045
2020-09-30	11190
2020-12-31	12310
2021-03-31	13328
2021-06-30	12357
2021-09-30	13489
2021-12-31	13521
2022-03-31	13528
2022-06-30	13380
2022-09-30	13380
2022-12-31	12365
2023-03-31	12558
2023-06-30	13018
2023-09-30	13578