Quarter	US dollars
1999-03-31	-23628
1999-06-30	-7729
1999-09-30	-1239
1999-12-31	-43
2000-03-31	8257
2000-06-30	10648
2000-09-30	-4741
2000-12-31	12052
2001-03-31	8591
2001-06-30	7403
2001-09-30	-6496
2001-12-31	-10152
2002-03-31	-12259
2002-06-30	-7314
2002-09-30	-4033
2002-12-31	21296
2003-03-31	-24752
2003-06-30	-11804
2003-09-30	-12108
2003-12-31	-3197
2004-03-31	6996
2004-06-30	-4297
2004-09-30	7194
2004-12-31	6643
2005-03-31	-17323
2005-06-30	14287
2005-09-30	7492
2005-12-31	7225
2006-03-31	-19554
2006-06-30	14505
2006-09-30	-3201
2006-12-31	-5751
2007-03-31	6444
2007-06-30	16475
2007-09-30	22270
2007-12-31	22444
2008-03-31	-21704
2008-06-30	14061
2008-09-30	-3204
2008-12-31	-10637
2009-03-31	-19461
2009-06-30	26186
2009-09-30	-11225
2009-12-31	-19037
2010-03-31	-7332
2010-06-30	-9468
2010-09-30	-3029
2010-12-31	-11649
2011-03-31	19439
2011-06-30	5682
2011-09-30	-662
2011-12-31	14149
2012-03-31	-18179
2012-06-30	12098
2012-09-30	5593
2012-12-31	813
2013-03-31	6852
2013-06-30	-3733
2013-09-30	10542
2013-12-31	9092
2014-03-31	-12365
2014-06-30	3417
2014-09-30	-11467
2014-12-31	22130
2015-03-31	-9636
2015-06-30	2917
2015-09-30	11128
2015-12-31	25682
2016-03-31	-19250
2016-06-30	23091
2016-09-30	-3159
2016-12-31	-16932
2017-03-31	-12420
2017-06-30	327
2017-09-30	10451
2017-12-31	16481
2018-03-31	4884
2018-06-30	-3835
2018-09-30	6117
2018-12-31	22129
2019-03-31	-2072
2019-06-30	1439
2019-09-30	4627
2019-12-31	5133
2020-03-31	27371
2020-06-30	-12809
2020-09-30	-2447
2020-12-31	21615
2021-03-31	-6533
2021-06-30	447
2021-09-30	-5809
2021-12-31	16269
2022-03-31	17569
2022-06-30	-3628
2022-09-30	22360
2022-12-31	-2620
2023-03-31	-22159
2023-06-30	-11822
2023-09-30	15239