Quarter	US dollars
1999-03-31	2006
1999-06-30	-1068
1999-09-30	1200
1999-12-31	1265
2000-03-31	328
2000-06-30	469
2000-09-30	1177
2000-12-31	500
2001-03-31	173
2001-06-30	591
2001-09-30	1477
2001-12-31	2162
2002-03-31	4928
2002-06-30	-1755
2002-09-30	1148
2002-12-31	-1167
2003-03-31	543
2003-06-30	3245
2003-09-30	1621
2003-12-31	-1103
2004-03-31	-10260
2004-06-30	187
2004-09-30	639
2004-12-31	-719
2005-03-31	-2488
2005-06-30	-104
2005-09-30	3153
2005-12-31	-2532
2006-03-31	4020
2006-06-30	-2517
2006-09-30	426
2006-12-31	-2318
2007-03-31	3011
2007-06-30	1037
2007-09-30	-622
2007-12-31	-785
2008-03-31	-770
2008-06-30	-1892
2008-09-30	-4773
2008-12-31	3946
2009-03-31	6083
2009-06-30	-2756
2009-09-30	-910
2009-12-31	-2363
2010-03-31	4769
2010-06-30	4955
2010-09-30	-1131
2010-12-31	-7344
2011-03-31	4436
2011-06-30	3018
2011-09-30	4581
2011-12-31	482
2012-03-31	7958
2012-06-30	1202
2012-09-30	5475
2012-12-31	2743
2013-03-31	6595
2013-06-30	434
2013-09-30	1288
2013-12-31	-6901
2014-03-31	13556
2014-06-30	-370
2014-09-30	3934
2014-12-31	1004
2015-03-31	7500
2015-06-30	4082
2015-09-30	1801
2015-12-31	-2506
2016-03-31	1150
2016-06-30	-1815
2016-09-30	-1362
2016-12-31	-6146
2017-03-31	-1652
2017-06-30	-2894
2017-09-30	-5323
2017-12-31	-4180
2018-03-31	2205
2018-06-30	-3065
2018-09-30	7517
2018-12-31	-2759
2019-03-31	13079
2019-06-30	3925
2019-09-30	1788
2019-12-31	-6181
2020-03-31	6495
2020-06-30	-1
2020-09-30	2254
2020-12-31	-2323
2021-03-31	1227
2021-06-30	3388
2021-09-30	-1588
2021-12-31	-5017
2022-03-31	5570
2022-06-30	751
2022-09-30	-1112
2022-12-31	-145
2023-03-31	3473
2023-06-30	4750
2023-09-30	2841