Quarter	US dollars
1999-03-31	-9731
1999-06-30	461
1999-09-30	6149
1999-12-31	11106
2000-03-31	-3815
2000-06-30	-4225
2000-09-30	8614
2000-12-31	546
2001-03-31	922
2001-06-30	4655
2001-09-30	3378
2001-12-31	-456
2002-03-31	17285
2002-06-30	-3590
2002-09-30	3113
2002-12-31	5946
2003-03-31	-5120
2003-06-30	11757
2003-09-30	-4550
2003-12-31	7674
2004-03-31	43835
2004-06-30	-21641
2004-09-30	8221
2004-12-31	-3238
2005-03-31	17147
2005-06-30	18377
2005-09-30	1578
2005-12-31	12287
2006-03-31	31110
2006-06-30	3554
2006-09-30	22559
2006-12-31	14546
2007-03-31	16250
2007-06-30	25200
2007-09-30	-11362
2007-12-31	9734
2008-03-31	-3307
2008-06-30	12722
2008-09-30	-15005
2008-12-31	-70732
2009-03-31	-2449
2009-06-30	14758
2009-09-30	5612
2009-12-31	33407
2010-03-31	25176
2010-06-30	-5434
2010-09-30	-11594
2010-12-31	34652
2011-03-31	5350
2011-06-30	10741
2011-09-30	-10438
2011-12-31	-17009
2012-03-31	-6375
2012-06-30	-6381
2012-09-30	12155
2012-12-31	21035
2013-03-31	10352
2013-06-30	-32937
2013-09-30	-8208
2013-12-31	-10013
2014-03-31	8053
2014-06-30	-2101
2014-09-30	-16621
2014-12-31	-15805
2015-03-31	10280
2015-06-30	-9640
2015-09-30	-12675
2015-12-31	9497
2016-03-31	12014
2016-06-30	20843
2016-09-30	-4244
2016-12-31	-10216
2017-03-31	16697
2017-06-30	-6087
2017-09-30	10724
2017-12-31	14614
2018-03-31	1733
2018-06-30	-1156
2018-09-30	-18073
2018-12-31	10721
2019-03-31	34010
2019-06-30	27311
2019-09-30	-17538
2019-12-31	-21827
2020-03-31	52226
2020-06-30	16035
2020-09-30	10745
2020-12-31	22696
2021-03-31	987
2021-06-30	-8529
2021-09-30	5859
2021-12-31	-4598
2022-03-31	59020
2022-06-30	13844
2022-09-30	-17509
2022-12-31	-30619
2023-03-31	-2151
2023-06-30	-34324
2023-09-30	23043