Quarter	US dollars
1999-09-30	0
1999-12-31	4515
2000-03-31	3798
2000-06-30	4550
2000-09-30	8102
2000-12-31	8844
2001-03-31	5543
2001-06-30	5505
2001-09-30	5949
2001-12-31	5229
2002-03-31	2970
2002-06-30	3609
2002-09-30	3558
2002-12-31	3478
2003-03-31	3432
2003-06-30	3222
2003-09-30	4872
2003-12-31	3449
2004-03-31	3507
2004-06-30	2982
2004-09-30	2625
2004-12-31	3326
2005-03-31	2491
2005-06-30	1835
2005-09-30	1585
2005-12-31	1155
2006-03-31	993
2006-06-30	698
2006-09-30	543
2006-12-31	940
2007-03-31	983
2007-06-30	557
2007-09-30	883
2007-12-31	823
2008-03-31	3167
2008-06-30	3756
2008-09-30	3545
2008-12-31	1187
2009-03-31	-2128
2009-06-30	-2470
2009-09-30	-3137
2009-12-31	-2916
2010-03-31	540
2010-06-30	-972
2010-09-30	-566
2010-12-31	534
2011-03-31	971
2011-06-30	1411
2011-09-30	1426
2011-12-31	2501
2012-03-31	1003
2012-06-30	2818
2012-09-30	1041
2012-12-31	2123
2013-03-31	2334
2013-06-30	784
2013-09-30	-2
2013-12-31	-739
2014-03-31	1000
2014-06-30	-862
2014-09-30	51
2014-12-31	432
2015-03-31	2380
2015-06-30	306
2015-09-30	4624
2015-12-31	5121
2016-03-31	3160
2016-06-30	4180
2016-09-30	8242
2016-12-31	6781
2017-03-31	4072
2017-06-30	650
2017-09-30	2294
2017-12-31	5355
2018-03-31	2790
2018-06-30	5728
2018-09-30	5120
2018-12-31	2945
2019-03-31	657
2019-06-30	6157
2019-09-30	1051
2019-12-31	514
2020-03-31	-592
2020-06-30	4802
2020-09-30	4631
2020-12-31	3679
2021-03-31	11882
2021-06-30	11588
2021-09-30	9342
2021-12-31	8274
2022-03-31	10166
2022-06-30	6587
2022-09-30	5403
2022-12-31	9928
2023-03-31	10575
2023-06-30	8404
2023-09-30	9913
2023-12-31	10737