Quarter	US dollars
2004-12-31	22910
2005-03-31	18244
2005-06-30	26950
2005-09-30	20428
2005-12-31	19677
2006-03-31	22526
2006-06-30	26343
2006-09-30	22116
2006-12-31	19617
2007-03-31	26819
2007-06-30	19797
2007-09-30	20792
2007-12-31	20494
2008-03-31	24695
2008-06-30	22291
2008-09-30	22011
2008-12-31	14862
2009-03-31	19946
2009-06-30	19513
2009-09-30	20405
2009-12-31	16030
2010-03-31	11811
2010-06-30	14018
2010-09-30	12372
2010-12-31	11544
2011-03-31	12786
2011-06-30	17194
2011-09-30	8530
2011-12-31	8408
2012-03-31	6070
2012-06-30	5625
2012-09-30	3889
2012-12-31	6236
2013-03-31	4544
2013-06-30	4286
2013-09-30	5155
2013-12-31	3568
2014-03-31	4035
2014-06-30	4495
2014-09-30	5245
2014-12-31	2249
2015-03-31	5719
2015-06-30	-629
2015-09-30	4576
2015-12-31	3314
2016-03-31	5859
2016-06-30	42
2016-09-30	348
2016-12-31	-1511
2017-03-31	215
2017-06-30	-25
2017-09-30	1645
2017-12-31	-1258
2018-03-31	4022
2018-06-30	2551
2018-09-30	2492
2018-12-31	4493
2019-03-31	6045
2019-06-30	7160
2019-09-30	6251
2019-12-31	3547
2020-03-31	6123
2020-06-30	4976
2020-09-30	6112
2020-12-31	3046
2021-03-31	2191
2021-06-30	2515
2021-09-30	239
2021-12-31	-1222
2022-03-31	1824
2022-06-30	4394
2022-09-30	2340
2022-12-31	1024
2023-03-31	-1330
2023-06-30	1525
2023-09-30	3756