Quarter	US dollars
1999-03-31	-9209
1999-06-30	-5527
1999-09-30	37029
1999-12-31	-4819
2000-03-31	144835
2000-06-30	30613
2000-09-30	44955
2000-12-31	76284
2001-03-31	173117
2001-06-30	-63615
2001-09-30	15616
2001-12-31	39642
2002-03-31	-65235
2002-06-30	10910
2002-09-30	51435
2002-12-31	96050
2003-03-31	79879
2003-06-30	111869
2003-09-30	-63947
2003-12-31	70624
2004-03-31	304998
2004-06-30	-10856
2004-09-30	42743
2004-12-31	18074
2005-03-31	234289
2005-06-30	158356
2005-09-30	38263
2005-12-31	36880
2006-03-31	292745
2006-06-30	38698
2006-09-30	180094
2006-12-31	51938
2007-03-31	560003
2007-06-30	134431
2007-09-30	200233
2007-12-31	142970
2008-03-31	291321
2008-06-30	-528124
2008-09-30	125668
2008-12-31	-441052
2009-03-31	-75063
2009-06-30	-70946
2009-09-30	-118413
2009-12-31	-119526
2010-03-31	131375
2010-06-30	30582
2010-09-30	119494
2010-12-31	-181533
2011-03-31	73975
2011-06-30	-35964
2011-09-30	90408
2011-12-31	-141904
2012-03-31	121505
2012-06-30	-128435
2012-09-30	-65143
2012-12-31	-146313
2013-03-31	-128525
2013-06-30	-80586
2013-09-30	-255806
2013-12-31	-113105
2014-03-31	11077
2014-06-30	2200
2014-09-30	46942
2014-12-31	12256
2015-03-31	44763
2015-06-30	-128260
2015-09-30	12553
2015-12-31	-6366
2016-03-31	-24722
2016-06-30	104047
2016-09-30	12069
2016-12-31	-53742
2017-03-31	14705
2017-06-30	36672
2017-09-30	31397
2017-12-31	98611
2018-03-31	124674
2018-06-30	-86629
2018-09-30	-59056
2018-12-31	163732
2019-03-31	-36836
2019-06-30	-13725
2019-09-30	60858
2019-12-31	-90399
2020-03-31	496704
2020-06-30	-255506
2020-09-30	24986
2020-12-31	83397
2021-03-31	88112
2021-06-30	-18907
2021-09-30	-6721
2021-12-31	94713
2022-03-31	194100
2022-06-30	79779
2022-09-30	64850
2022-12-31	-221274
2023-03-31	62626
2023-06-30	-54184
2023-09-30	132181