Quarter	US dollars
2004-12-31	26360
2005-03-31	25736
2005-06-30	25156
2005-09-30	24899
2005-12-31	26120
2006-03-31	26928
2006-06-30	26188
2006-09-30	27483
2006-12-31	29324
2007-03-31	32781
2007-06-30	35586
2007-09-30	37350
2007-12-31	32326
2008-03-31	35501
2008-06-30	35000
2008-09-30	35277
2008-12-31	22378
2009-03-31	17703
2009-06-30	22229
2009-09-30	17426
2009-12-31	14861
2010-03-31	12796
2010-06-30	13035
2010-09-30	12264
2010-12-31	12181
2011-03-31	14355
2011-06-30	13675
2011-09-30	8243
2011-12-31	6055
2012-03-31	5424
2012-06-30	4110
2012-09-30	7739
2012-12-31	12758
2013-03-31	14225
2013-06-30	9643
2013-09-30	9618
2013-12-31	10185
2014-03-31	7271
2014-06-30	11494
2014-09-30	11269
2014-12-31	11920
2015-03-31	7380
2015-06-30	7286
2015-09-30	7213
2015-12-31	4177
2016-03-31	4818
2016-06-30	3629
2016-09-30	3870
2016-12-31	3426
2017-03-31	3546
2017-06-30	847
2017-09-30	569
2017-12-31	1902
2018-03-31	1441
2018-06-30	-2783
2018-09-30	-912
2018-12-31	-1968
2019-03-31	-9900
2019-06-30	-8602
2019-09-30	-3981
2019-12-31	-3572
2020-03-31	7428
2020-06-30	2535
2020-09-30	4036
2020-12-31	3749
2021-03-31	6132
2021-06-30	-12522
2021-09-30	-18582
2021-12-31	-12995
2022-03-31	-16312
2022-06-30	-10113
2022-09-30	-7492
2022-12-31	-9726
2023-03-31	-10143
2023-06-30	-14225
2023-09-30	-14547