Quarter	US dollars
1999-03-31	1031
1999-06-30	2386
1999-09-30	-1472
1999-12-31	-2877
2000-03-31	10080
2000-06-30	-4249
2000-09-30	-295
2000-12-31	-65
2001-03-31	2823
2001-06-30	-4897
2001-09-30	395
2001-12-31	-2308
2002-03-31	-18
2002-06-30	-3574
2002-09-30	-718
2002-12-31	-3680
2003-03-31	2650
2003-06-30	1505
2003-09-30	-1945
2003-12-31	-3456
2004-03-31	3680
2004-06-30	-3649
2004-09-30	353
2004-12-31	-6720
2005-03-31	4433
2005-06-30	6233
2005-09-30	-4334
2005-12-31	1780
2006-03-31	10666
2006-06-30	-6277
2006-09-30	-4088
2006-12-31	-325
2007-03-31	1351
2007-06-30	7006
2007-09-30	7451
2007-12-31	-416
2008-03-31	-133
2008-06-30	-1153
2008-09-30	-741
2008-12-31	-8466
2009-03-31	3194
2009-06-30	-2599
2009-09-30	-7659
2009-12-31	2178
2010-03-31	-4151
2010-06-30	8000
2010-09-30	3624
2010-12-31	1138
2011-03-31	5806
2011-06-30	4247
2011-09-30	43714
2011-12-31	22696
2012-03-31	-42598
2012-06-30	19628
2012-09-30	15762
2012-12-31	-9112
2013-03-31	10908
2013-06-30	-31739
2013-09-30	125
2013-12-31	8896
2014-03-31	-9453
2014-06-30	-11709
2014-09-30	21512
2014-12-31	-16235
2015-03-31	-799
2015-06-30	-12038
2015-09-30	1589
2015-12-31	-1176
2016-03-31	-20881
2016-06-30	11002
2016-09-30	-2152
2016-12-31	-4739
2017-03-31	2218
2017-06-30	-956
2017-09-30	-12269
2017-12-31	7673
2018-03-31	-8616
2018-06-30	-1143
2018-09-30	7088
2018-12-31	-2624
2019-03-31	10211
2019-06-30	-4606
2019-09-30	10167
2019-12-31	18868
2020-03-31	-11209
2020-06-30	-12436
2020-09-30	2446
2020-12-31	9249
2021-03-31	5472
2021-06-30	-14817
2021-09-30	-7711
2021-12-31	31676
2022-03-31	-22690
2022-06-30	-24587
2022-09-30	19298
2022-12-31	1398
2023-03-31	-7399
2023-06-30	4723
2023-09-30	1598