Quarter	US dollars
2004-12-31	4408
2005-03-31	4807
2005-06-30	4379
2005-09-30	4659
2005-12-31	4599
2006-03-31	4680
2006-06-30	8217
2006-09-30	12487
2006-12-31	10427
2007-03-31	10085
2007-06-30	13012
2007-09-30	12685
2007-12-31	13982
2008-03-31	16220
2008-06-30	14295
2008-09-30	14000
2008-12-31	8193
2009-03-31	8705
2009-06-30	9545
2009-09-30	7832
2009-12-31	7872
2010-03-31	6620
2010-06-30	6535
2010-09-30	6913
2010-12-31	6846
2011-03-31	6649
2011-06-30	6284
2011-09-30	5460
2011-12-31	6072
2012-03-31	7044
2012-06-30	5092
2012-09-30	5775
2012-12-31	5751
2013-03-31	5708
2013-06-30	4885
2013-09-30	5106
2013-12-31	5117
2014-03-31	6046
2014-06-30	5375
2014-09-30	6632
2014-12-31	10457
2015-03-31	5259
2015-06-30	5277
2015-09-30	5276
2015-12-31	5818
2016-03-31	6692
2016-06-30	6626
2016-09-30	6392
2016-12-31	6763
2017-03-31	7533
2017-06-30	7238
2017-09-30	7328
2017-12-31	5701
2018-03-31	6131
2018-06-30	6436
2018-09-30	6378
2018-12-31	6987
2019-03-31	8308
2019-06-30	7610
2019-09-30	7512
2019-12-31	8408
2020-03-31	7629
2020-06-30	6936
2020-09-30	8918
2020-12-31	8604
2021-03-31	8716
2021-06-30	9224
2021-09-30	8450
2021-12-31	8433
2022-03-31	8357
2022-06-30	7521
2022-09-30	7770
2022-12-31	8126
2023-03-31	8503
2023-06-30	8239
2023-09-30	8330