Quarter	US dollars
1999-03-31	-52569
1999-06-30	3692
1999-09-30	45392
1999-12-31	-2945
2000-03-31	76398
2000-06-30	27025
2000-09-30	26903
2000-12-31	79074
2001-03-31	95915
2001-06-30	-47966
2001-09-30	25691
2001-12-31	21702
2002-03-31	-9368
2002-06-30	35684
2002-09-30	17280
2002-12-31	82947
2003-03-31	51374
2003-06-30	104726
2003-09-30	-96043
2003-12-31	8269
2004-03-31	148729
2004-06-30	33868
2004-09-30	-6878
2004-12-31	52195
2005-03-31	132666
2005-06-30	78920
2005-09-30	56287
2005-12-31	3484
2006-03-31	178952
2006-06-30	-10399
2006-09-30	-14943
2006-12-31	61309
2007-03-31	347199
2007-06-30	-4925
2007-09-30	119325
2007-12-31	185165
2008-03-31	200228
2008-06-30	-490223
2008-09-30	67673
2008-12-31	-102035
2009-03-31	-124249
2009-06-30	-99045
2009-09-30	-52664
2009-12-31	25600
2010-03-31	35208
2010-06-30	-41554
2010-09-30	-12240
2010-12-31	-15362
2011-03-31	-23467
2011-06-30	-53702
2011-09-30	192657
2011-12-31	-20195
2012-03-31	11758
2012-06-30	-54903
2012-09-30	45458
2012-12-31	-32884
2013-03-31	-119567
2013-06-30	-149929
2013-09-30	-123455
2013-12-31	-1903
2014-03-31	-13462
2014-06-30	17518
2014-09-30	-23908
2014-12-31	-32437
2015-03-31	2617
2015-06-30	-89197
2015-09-30	-61505
2015-12-31	58497
2016-03-31	-13317
2016-06-30	-85
2016-09-30	-98204
2016-12-31	5853
2017-03-31	20898
2017-06-30	59843
2017-09-30	-94289
2017-12-31	6260
2018-03-31	21736
2018-06-30	-18968
2018-09-30	-38302
2018-12-31	-1927
2019-03-31	145859
2019-06-30	20557
2019-09-30	49480
2019-12-31	-116192
2020-03-31	213723
2020-06-30	-17987
2020-09-30	9495
2020-12-31	131103
2021-03-31	71301
2021-06-30	-82357
2021-09-30	-4259
2021-12-31	31373
2022-03-31	81641
2022-06-30	17768
2022-09-30	-51969
2022-12-31	-35047
2023-03-31	40174
2023-06-30	-9501
2023-09-30	42824