Quarter	US dollars
1999-09-30	-3771
1999-12-31	-4256
2000-03-31	-5853
2000-06-30	-6676
2000-09-30	-5552
2000-12-31	-5893
2001-03-31	-5261
2001-06-30	-3866
2001-09-30	-4001
2001-12-31	-3769
2002-03-31	-4603
2002-06-30	-4680
2002-09-30	-5465
2002-12-31	-6421
2003-03-31	-5842
2003-06-30	-6666
2003-09-30	-6454
2003-12-31	-6617
2004-03-31	-7193
2004-06-30	-7213
2004-09-30	-8733
2004-12-31	-9970
2005-03-31	-12089
2005-06-30	-14991
2005-09-30	-14489
2005-12-31	-13177
2006-03-31	-11912
2006-06-30	-13367
2006-09-30	-15621
2006-12-31	-15613
2007-03-31	-13675
2007-06-30	-13656
2007-09-30	-17387
2007-12-31	-23640
2008-03-31	-25239
2008-06-30	-15490
2008-09-30	-10303
2008-12-31	-7174
2009-03-31	-10515
2009-06-30	-14592
2009-09-30	-11550
2009-12-31	-9343
2010-03-31	-14507
2010-06-30	-16559
2010-09-30	-15860
2010-12-31	-18512
2011-03-31	-14664
2011-06-30	-9468
2011-09-30	-16713
2011-12-31	-15761
2012-03-31	-14122
2012-06-30	-16907
2012-09-30	-17637
2012-12-31	-20259
2013-03-31	-15253
2013-06-30	-15629
2013-09-30	-16115
2013-12-31	-14558
2014-03-31	-16990
2014-06-30	-17761
2014-09-30	-15484
2014-12-31	-14618
2015-03-31	-13937
2015-06-30	-12872
2015-09-30	-12643
2015-12-31	-11685
2016-03-31	-11226
2016-06-30	-12332
2016-09-30	-16426
2016-12-31	-14786
2017-03-31	-12310
2017-06-30	-13454
2017-09-30	-16295
2017-12-31	-17239
2018-03-31	-17419
2018-06-30	-16182
2018-09-30	-11857
2018-12-31	-12557
2019-03-31	-11255
2019-06-30	-14834
2019-09-30	-17544
2019-12-31	-18582
2020-03-31	-17016
2020-06-30	-22476
2020-09-30	-27385
2020-12-31	-28545
2021-03-31	-27269
2021-06-30	-20268
2021-09-30	-20102
2021-12-31	-21535
2022-03-31	-19036
2022-06-30	-15442
2022-09-30	-8706
2022-12-31	-10000
2023-03-31	-10000
2023-06-30	-10494
2023-09-30	-9401
2023-12-31	-9877