Quarter	US dollars
2004-12-31	53316
2005-03-31	41895
2005-06-30	61228
2005-09-30	61105
2005-12-31	54517
2006-03-31	46637
2006-06-30	53266
2006-09-30	43378
2006-12-31	52264
2007-03-31	53216
2007-06-30	70621
2007-09-30	87486
2007-12-31	101576
2008-03-31	180346
2008-06-30	190124
2008-09-30	193080
2008-12-31	320917
2009-03-31	322423
2009-06-30	219467
2009-09-30	210617
2009-12-31	165909
2010-03-31	148935
2010-06-30	164772
2010-09-30	180543
2010-12-31	164116
2011-03-31	137933
2011-06-30	144631
2011-09-30	199391
2011-12-31	177650
2012-03-31	150300
2012-06-30	151202
2012-09-30	116095
2012-12-31	99453
2013-03-31	82800
2013-06-30	80315
2013-09-30	60232
2013-12-31	52648
2014-03-31	65075
2014-06-30	75254
2014-09-30	90567
2014-12-31	94628
2015-03-31	97799
2015-06-30	72239
2015-09-30	79605
2015-12-31	65327
2016-03-31	73372
2016-06-30	72325
2016-09-30	58982
2016-12-31	56553
2017-03-31	42042
2017-06-30	42701
2017-09-30	41276
2017-12-31	4072
2018-03-31	915
2018-06-30	5560
2018-09-30	35395
2018-12-31	37370
2019-03-31	63627
2019-06-30	31279
2019-09-30	39760
2019-12-31	30859
2020-03-31	43298
2020-06-30	39807
2020-09-30	31273
2020-12-31	38010
2021-03-31	31731
2021-06-30	31970
2021-09-30	23036
2021-12-31	23962
2022-03-31	22997
2022-06-30	29925
2022-09-30	39307
2022-12-31	30253
2023-03-31	29326
2023-06-30	28900
2023-09-30	29970