Quarter	US dollars
1999-03-31	17907
1999-06-30	-15651
1999-09-30	10954
1999-12-31	-24199
2000-03-31	11935
2000-06-30	-1981
2000-09-30	-5068
2000-12-31	6478
2001-03-31	35859
2001-06-30	-2269
2001-09-30	-10327
2001-12-31	2979
2002-03-31	276
2002-06-30	-17053
2002-09-30	13957
2002-12-31	-3364
2003-03-31	-2052
2003-06-30	12335
2003-09-30	14406
2003-12-31	-15933
2004-03-31	22069
2004-06-30	5802
2004-09-30	-11967
2004-12-31	14079
2005-03-31	19315
2005-06-30	22865
2005-09-30	-25118
2005-12-31	8489
2006-03-31	-45339
2006-06-30	-11242
2006-09-30	144
2006-12-31	22486
2007-03-31	14442
2007-06-30	21746
2007-09-30	7328
2007-12-31	-14833
2008-03-31	4698
2008-06-30	-31290
2008-09-30	-5943
2008-12-31	37539
2009-03-31	-19145
2009-06-30	-28796
2009-09-30	-16260
2009-12-31	8272
2010-03-31	30678
2010-06-30	3429
2010-09-30	7359
2010-12-31	-695
2011-03-31	-11996
2011-06-30	-4384
2011-09-30	12620
2011-12-31	-11563
2012-03-31	-15145
2012-06-30	-731
2012-09-30	-2333
2012-12-31	-10021
2013-03-31	-8261
2013-06-30	-10293
2013-09-30	-4306
2013-12-31	628
2014-03-31	-5071
2014-06-30	-3740
2014-09-30	741
2014-12-31	923
2015-03-31	26873
2015-06-30	6369
2015-09-30	13088
2015-12-31	-9439
2016-03-31	1097
2016-06-30	-15020
2016-09-30	2499
2016-12-31	129
2017-03-31	2910
2017-06-30	-7115
2017-09-30	-23777
2017-12-31	-12725
2018-03-31	-2905
2018-06-30	16014
2018-09-30	9136
2018-12-31	-10678
2019-03-31	-3719
2019-06-30	-2717
2019-09-30	-1100
2019-12-31	1689
2020-03-31	18723
2020-06-30	-11065
2020-09-30	-2620
2020-12-31	-6744
2021-03-31	1728
2021-06-30	-5493
2021-09-30	11781
2021-12-31	-385
2022-03-31	19615
2022-06-30	-4066
2022-09-30	-10699
2022-12-31	829
2023-03-31	-5807
2023-06-30	-11471
2023-09-30	4224