Quarter	US dollars
1999-03-31	2163
1999-06-30	1303
1999-09-30	261
1999-12-31	-2080
2000-03-31	9538
2000-06-30	141
2000-09-30	2432
2000-12-31	-2070
2001-03-31	3671
2001-06-30	3785
2001-09-30	-877
2001-12-31	-4696
2002-03-31	-1937
2002-06-30	2557
2002-09-30	-1699
2002-12-31	-397
2003-03-31	3594
2003-06-30	-1192
2003-09-30	4919
2003-12-31	8645
2004-03-31	15432
2004-06-30	6041
2004-09-30	6410
2004-12-31	-4483
2005-03-31	9155
2005-06-30	-11238
2005-09-30	12926
2005-12-31	-6651
2006-03-31	10755
2006-06-30	-2712
2006-09-30	7564
2006-12-31	2421
2007-03-31	13286
2007-06-30	5632
2007-09-30	10451
2007-12-31	-6243
2008-03-31	-19431
2008-06-30	-27591
2008-09-30	-269
2008-12-31	-14200
2009-03-31	4459
2009-06-30	5325
2009-09-30	-10740
2009-12-31	-12355
2010-03-31	9491
2010-06-30	13829
2010-09-30	-1983
2010-12-31	3691
2011-03-31	-720
2011-06-30	-2519
2011-09-30	6647
2011-12-31	11602
2012-03-31	-6711
2012-06-30	-5031
2012-09-30	13611
2012-12-31	-817
2013-03-31	5397
2013-06-30	-12504
2013-09-30	9723
2013-12-31	16715
2014-03-31	2477
2014-06-30	21663
2014-09-30	2341
2014-12-31	-4720
2015-03-31	-940
2015-06-30	299
2015-09-30	3127
2015-12-31	889
2016-03-31	15379
2016-06-30	-8165
2016-09-30	6748
2016-12-31	-21683
2017-03-31	17877
2017-06-30	-1385
2017-09-30	-2045
2017-12-31	1400
2018-03-31	-2745
2018-06-30	-16676
2018-09-30	15049
2018-12-31	1677
2019-03-31	33893
2019-06-30	-5004
2019-09-30	-14402
2019-12-31	-14992
2020-03-31	38842
2020-06-30	-27824
2020-09-30	6457
2020-12-31	10790
2021-03-31	36566
2021-06-30	1276
2021-09-30	7627
2021-12-31	4275
2022-03-31	15951
2022-06-30	-11784
2022-09-30	-28411
2022-12-31	-18305
2023-03-31	-11245
2023-06-30	-16580
2023-09-30	11914