Quarter	US dollars
1999-03-31	0
1999-06-30	0
1999-09-30	0
1999-12-31	1
2000-03-31	1
2000-06-30	0
2000-09-30	1
2000-12-31	1
2001-03-31	1
2001-06-30	1
2001-09-30	1
2001-12-31	0
2002-03-31	2
2002-06-30	2
2002-09-30	3
2002-12-31	3
2003-03-31	1
2003-06-30	1
2003-09-30	3
2003-12-31	3
2004-03-31	92
2004-06-30	94
2004-09-30	116
2004-12-31	122
2005-03-31	131
2005-06-30	148
2005-09-30	148
2005-12-31	168
2006-03-31	302
2006-06-30	297
2006-09-30	261
2006-12-31	195
2007-03-31	182
2007-06-30	195
2007-09-30	176
2007-12-31	142
2008-03-31	349
2008-06-30	331
2008-09-30	383
2008-12-31	413
2009-03-31	371
2009-06-30	381
2009-09-30	258
2009-12-31	284
2010-03-31	764
2010-06-30	621
2010-09-30	1787
2010-12-31	410
2011-03-31	656
2011-06-30	1125
2011-09-30	888
2011-12-31	721
2012-03-31	727
2012-06-30	578
2012-09-30	424
2012-12-31	432
2013-03-31	470
2013-06-30	357
2013-09-30	353
2013-12-31	377
2014-03-31	309
2014-06-30	363
2014-09-30	332
2014-12-31	272
2015-03-31	293
2015-06-30	610
2015-09-30	377
2015-12-31	1044
2016-03-31	957
2016-06-30	965
2016-09-30	919
2016-12-31	734
2017-03-31	1017
2017-06-30	929
2017-09-30	1103
2017-12-31	946
2018-03-31	819
2018-06-30	668
2018-09-30	817
2018-12-31	745
2019-03-31	804
2019-06-30	844
2019-09-30	692
2019-12-31	659
2020-03-31	567
2020-06-30	536
2020-09-30	419
2020-12-31	380
2021-03-31	395
2021-06-30	450
2021-09-30	608
2021-12-31	329
2022-03-31	397
2022-06-30	362
2022-09-30	421
2022-12-31	421
2023-03-31	761
2023-06-30	428
2023-09-30	380