Quarter	US dollars
1999-03-31	-1864
1999-06-30	-2682
1999-09-30	1363
1999-12-31	-316
2000-03-31	6571
2000-06-30	-1175
2000-09-30	1288
2000-12-31	3039
2001-03-31	-2502
2001-06-30	4469
2001-09-30	-1284
2001-12-31	1804
2002-03-31	352
2002-06-30	-1947
2002-09-30	-168
2002-12-31	-379
2003-03-31	5428
2003-06-30	-2914
2003-09-30	-1972
2003-12-31	-5676
2004-03-31	-348
2004-06-30	1574
2004-09-30	674
2004-12-31	-4999
2005-03-31	3011
2005-06-30	2692
2005-09-30	-1926
2005-12-31	2191
2006-03-31	9806
2006-06-30	-4877
2006-09-30	-5630
2006-12-31	3050
2007-03-31	6514
2007-06-30	1489
2007-09-30	-2327
2007-12-31	4088
2008-03-31	-873
2008-06-30	-4814
2008-09-30	4918
2008-12-31	-9988
2009-03-31	-3311
2009-06-30	-3833
2009-09-30	-5834
2009-12-31	537
2010-03-31	605
2010-06-30	-1151
2010-09-30	-2548
2010-12-31	104
2011-03-31	8397
2011-06-30	-7315
2011-09-30	12887
2011-12-31	35928
2012-03-31	-36549
2012-06-30	6642
2012-09-30	-826
2012-12-31	-6992
2013-03-31	-604
2013-06-30	-2852
2013-09-30	218
2013-12-31	367
2014-03-31	-3036
2014-06-30	-2407
2014-09-30	3156
2014-12-31	-3563
2015-03-31	2200
2015-06-30	-14005
2015-09-30	-3639
2015-12-31	1144
2016-03-31	250
2016-06-30	1284
2016-09-30	-4075
2016-12-31	1591
2017-03-31	-3184
2017-06-30	8542
2017-09-30	173
2017-12-31	1242
2018-03-31	-756
2018-06-30	-1107
2018-09-30	-3940
2018-12-31	809
2019-03-31	3048
2019-06-30	-3639
2019-09-30	9630
2019-12-31	6813
2020-03-31	1337
2020-06-30	-8423
2020-09-30	-602
2020-12-31	-1044
2021-03-31	846
2021-06-30	-4371
2021-09-30	-3606
2021-12-31	-1747
2022-03-31	1858
2022-06-30	-602
2022-09-30	1404
2022-12-31	-597
2023-03-31	971
2023-06-30	-601
2023-09-30	2399