Quarter	US dollars
2004-12-31	13791
2005-03-31	10159
2005-06-30	13609
2005-09-30	10988
2005-12-31	9337
2006-03-31	9018
2006-06-30	10625
2006-09-30	9296
2006-12-31	10041
2007-03-31	12325
2007-06-30	16573
2007-09-30	19791
2007-12-31	28892
2008-03-31	48759
2008-06-30	51229
2008-09-30	70439
2008-12-31	93014
2009-03-31	102491
2009-06-30	61646
2009-09-30	57188
2009-12-31	45626
2010-03-31	44018
2010-06-30	56935
2010-09-30	58935
2010-12-31	51596
2011-03-31	44469
2011-06-30	44327
2011-09-30	66368
2011-12-31	58933
2012-03-31	49910
2012-06-30	48134
2012-09-30	38800
2012-12-31	36633
2013-03-31	33060
2013-06-30	26964
2013-09-30	24297
2013-12-31	20483
2014-03-31	19482
2014-06-30	20251
2014-09-30	20925
2014-12-31	22802
2015-03-31	22204
2015-06-30	15842
2015-09-30	17736
2015-12-31	13918
2016-03-31	15929
2016-06-30	15995
2016-09-30	12868
2016-12-31	12366
2017-03-31	9281
2017-06-30	7772
2017-09-30	7571
2017-12-31	-1986
2018-03-31	-3379
2018-06-30	-1146
2018-09-30	8895
2018-12-31	6482
2019-03-31	11258
2019-06-30	5552
2019-09-30	6175
2019-12-31	5009
2020-03-31	8082
2020-06-30	6552
2020-09-30	3038
2020-12-31	5511
2021-03-31	5528
2021-06-30	5427
2021-09-30	5395
2021-12-31	5710
2022-03-31	6309
2022-06-30	12397
2022-09-30	11336
2022-12-31	5783
2023-03-31	4431
2023-06-30	5194
2023-09-30	5067