Quarter	US dollars
1999-03-31	-2929
1999-06-30	-43
1999-09-30	18231
1999-12-31	23700
2000-03-31	27550
2000-06-30	-2797
2000-09-30	19587
2000-12-31	47646
2001-03-31	-16318
2001-06-30	-23802
2001-09-30	-3822
2001-12-31	20867
2002-03-31	8005
2002-06-30	11576
2002-09-30	15136
2002-12-31	13913
2003-03-31	24617
2003-06-30	21276
2003-09-30	-18768
2003-12-31	50631
2004-03-31	55423
2004-06-30	20193
2004-09-30	-7235
2004-12-31	-22341
2005-03-31	35615
2005-06-30	37379
2005-09-30	-23801
2005-12-31	2158
2006-03-31	92457
2006-06-30	76129
2006-09-30	-19758
2006-12-31	-25586
2007-03-31	170873
2007-06-30	-43520
2007-09-30	52629
2007-12-31	62248
2008-03-31	-16321
2008-06-30	-172704
2008-09-30	-32908
2008-12-31	-122991
2009-03-31	1775
2009-06-30	-27171
2009-09-30	37016
2009-12-31	-49486
2010-03-31	10025
2010-06-30	39484
2010-09-30	27691
2010-12-31	-44622
2011-03-31	-62356
2011-06-30	45897
2011-09-30	-13017
2011-12-31	48464
2012-03-31	23974
2012-06-30	-4064
2012-09-30	-15644
2012-12-31	-36776
2013-03-31	-20939
2013-06-30	-34672
2013-09-30	-17645
2013-12-31	7333
2014-03-31	-2825
2014-06-30	40367
2014-09-30	33121
2014-12-31	-12058
2015-03-31	-8227
2015-06-30	-64975
2015-09-30	-471
2015-12-31	-21564
2016-03-31	-25137
2016-06-30	27891
2016-09-30	7166
2016-12-31	-25753
2017-03-31	-26796
2017-06-30	9903
2017-09-30	25965
2017-12-31	-5154
2018-03-31	14613
2018-06-30	1140
2018-09-30	-28502
2018-12-31	26885
2019-03-31	18120
2019-06-30	-18485
2019-09-30	19165
2019-12-31	-13734
2020-03-31	44313
2020-06-30	-22411
2020-09-30	12118
2020-12-31	-20739
2021-03-31	50321
2021-06-30	-17274
2021-09-30	14576
2021-12-31	1524
2022-03-31	31144
2022-06-30	-7158
2022-09-30	5302
2022-12-31	-32225
2023-03-31	2816
2023-06-30	-15469
2023-09-30	6421