Quarter	US dollars
1999-03-31	31
1999-06-30	27
1999-09-30	65
1999-12-31	35
2000-03-31	58
2000-06-30	60
2000-09-30	43
2000-12-31	42
2001-03-31	40
2001-06-30	39
2001-09-30	67
2001-12-31	43
2002-03-31	43
2002-06-30	49
2002-09-30	56
2002-12-31	58
2003-03-31	51
2003-06-30	53
2003-09-30	49
2003-12-31	51
2004-03-31	65
2004-06-30	100
2004-09-30	160
2004-12-31	196
2005-03-31	69
2005-06-30	63
2005-09-30	127
2005-12-31	109
2006-03-31	106
2006-06-30	30
2006-09-30	45
2006-12-31	78
2007-03-31	210
2007-06-30	633
2007-09-30	70
2007-12-31	243
2008-03-31	57
2008-06-30	18
2008-09-30	28
2008-12-31	1190
2009-03-31	831
2009-06-30	623
2009-09-30	522
2009-12-31	558
2010-03-31	61
2010-06-30	2324
2010-09-30	2829
2010-12-31	2229
2011-03-31	1806
2011-06-30	229
2011-09-30	1445
2011-12-31	43
2012-03-31	1
2012-06-30	1
2012-09-30	8
2012-12-31	1
2013-03-31	62
2013-06-30	484
2013-09-30	314
2013-12-31	925
2014-03-31	392
2014-06-30	661
2014-09-30	1
2014-12-31	701
2015-03-31	270
2015-06-30	55
2015-09-30	63
2015-12-31	327