Quarter	US dollars
2004-12-31	175575
2005-03-31	175560
2005-06-30	150330
2005-09-30	155976
2005-12-31	152987
2006-03-31	178068
2006-06-30	167196
2006-09-30	181232
2006-12-31	199676
2007-03-31	221231
2007-06-30	219621
2007-09-30	259253
2007-12-31	232189
2008-03-31	241076
2008-06-30	165992
2008-09-30	182555
2008-12-31	106939
2009-03-31	92617
2009-06-30	89861
2009-09-30	69782
2009-12-31	-15265
2010-03-31	-11744
2010-06-30	-35678
2010-09-30	-39367
2010-12-31	-30729
2011-03-31	-36704
2011-06-30	-16809
2011-09-30	-25595
2011-12-31	-25294
2012-03-31	-26362
2012-06-30	-33421
2012-09-30	-17103
2012-12-31	33282
2013-03-31	30678
2013-06-30	23136
2013-09-30	21766
2013-12-31	27432
2014-03-31	32192
2014-06-30	44204
2014-09-30	34982
2014-12-31	33610
2015-03-31	26591
2015-06-30	30854
2015-09-30	32983
2015-12-31	22651
2016-03-31	27436
2016-06-30	23796
2016-09-30	23979
2016-12-31	28068
2017-03-31	34955
2017-06-30	21198
2017-09-30	27661
2017-12-31	37721
2018-03-31	46392
2018-06-30	33412
2018-09-30	34697
2018-12-31	27319
2019-03-31	15688
2019-06-30	1769
2019-09-30	4420
2019-12-31	14950
2020-03-31	15439
2020-06-30	8818
2020-09-30	27274
2020-12-31	30499
2021-03-31	38507
2021-06-30	21401
2021-09-30	18851
2021-12-31	24195
2022-03-31	25005
2022-06-30	24527
2022-09-30	22188
2022-12-31	20463
2023-03-31	15974
2023-06-30	14349
2023-09-30	9461