Quarter	US dollars
1999-03-31	428
1999-06-30	497
1999-09-30	575
1999-12-31	557
2000-03-31	527
2000-06-30	594
2000-09-30	515
2000-12-31	545
2001-03-31	651
2001-06-30	531
2001-09-30	533
2001-12-31	526
2002-03-31	643
2002-06-30	693
2002-09-30	633
2002-12-31	638
2003-03-31	610
2003-06-30	577
2003-09-30	568
2003-12-31	626
2004-03-31	509
2004-06-30	377
2004-09-30	325
2004-12-31	201
2005-03-31	112
2005-06-30	135
2005-09-30	269
2005-12-31	138
2006-03-31	479
2006-06-30	133
2006-09-30	170
2006-12-31	7
2007-03-31	2
2007-06-30	350
2007-09-30	253
2007-12-31	424
2008-03-31	386
2008-06-30	935
2008-09-30	588
2008-12-31	406
2009-03-31	265
2009-06-30	271
2009-09-30	148
2009-12-31	50
2010-03-31	121
2010-06-30	80
2010-09-30	156
2010-12-31	86
2011-03-31	117
2011-06-30	201
2011-09-30	37
2011-12-31	201
2012-03-31	211
2012-06-30	4
2012-09-30	3
2012-12-31	31
2013-03-31	48
2013-06-30	117
2013-09-30	35
2013-12-31	11
2014-03-31	24
2014-06-30	15
2014-09-30	7
2014-12-31	19
2015-03-31	27
2015-06-30	30
2015-09-30	5
2015-12-31	11
2016-03-31	2
2016-06-30	2
2016-09-30	12
2016-12-31	13
2017-03-31	2
2017-06-30	5
2017-09-30	8
2017-12-31	4
2018-03-31	6
2018-06-30	6
2018-09-30	3
2018-12-31	3
2019-03-31	3
2019-06-30	5
2019-09-30	3
2019-12-31	5
2020-03-31	2
2020-06-30	3
2020-09-30	5
2020-12-31	6
2021-03-31	4
2021-06-30	6
2021-09-30	5
2021-12-31	3
2022-03-31	5
2022-06-30	6
2022-09-30	9
2022-12-31	3
2023-03-31	3
2023-06-30	4
2023-09-30	2