Quarter	US dollars
1999-03-31	76948
1999-06-30	-10236
1999-09-30	10283
1999-12-31	4761
2000-03-31	18869
2000-06-30	15653
2000-09-30	24552
2000-12-31	34283
2001-03-31	32486
2001-06-30	-1206
2001-09-30	5937
2001-12-31	11323
2002-03-31	20511
2002-06-30	453
2002-09-30	9853
2002-12-31	29052
2003-03-31	-2604
2003-06-30	377
2003-09-30	27299
2003-12-31	8308
2004-03-31	64562
2004-06-30	15891
2004-09-30	9486
2004-12-31	-19555
2005-03-31	46117
2005-06-30	22533
2005-09-30	31514
2005-12-31	2765
2006-03-31	77758
2006-06-30	14107
2006-09-30	88423
2006-12-31	-6873
2007-03-31	90322
2007-06-30	62129
2007-09-30	72770
2007-12-31	-14552
2008-03-31	92146
2008-06-30	-43034
2008-09-30	62876
2008-12-31	-95191
2009-03-31	71235
2009-06-30	11952
2009-09-30	74389
2009-12-31	31748
2010-03-31	37136
2010-06-30	-78707
2010-09-30	59869
2010-12-31	-25830
2011-03-31	19466
2011-06-30	-7347
2011-09-30	-60324
2011-12-31	-39876
2012-03-31	-325
2012-06-30	-8297
2012-09-30	-29893
2012-12-31	-15178
2013-03-31	6808
2013-06-30	-78897
2013-09-30	-24925
2013-12-31	-16385
2014-03-31	-16197
2014-06-30	13991
2014-09-30	25151
2014-12-31	-24759
2015-03-31	21981
2015-06-30	-34248
2015-09-30	-3165
2015-12-31	-4132
2016-03-31	12342
2016-06-30	68438
2016-09-30	29132
2016-12-31	-26098
2017-03-31	31940
2017-06-30	7084
2017-09-30	4043
2017-12-31	5212
2018-03-31	42661
2018-06-30	51247
2018-09-30	-4747
2018-12-31	8375
2019-03-31	-24579
2019-06-30	50082
2019-09-30	44521
2019-12-31	-81323
2020-03-31	55806
2020-06-30	198
2020-09-30	-14461
2020-12-31	-41926
2021-03-31	3726
2021-06-30	16609
2021-09-30	-12464
2021-12-31	22152
2022-03-31	4725
2022-06-30	53583
2022-09-30	-4801
2022-12-31	-34621
2023-03-31	9344
2023-06-30	-29474
2023-09-30	32696