Quarter	US dollars
1999-03-31	2
1999-06-30	2
1999-09-30	1
1999-12-31	2
2000-03-31	1
2000-06-30	1
2000-09-30	2
2000-12-31	2
2001-03-31	2
2001-06-30	15
2001-09-30	17
2001-12-31	17
2002-03-31	14
2002-06-30	16
2002-09-30	17
2002-12-31	18
2003-03-31	14
2003-06-30	3
2003-09-30	4
2003-12-31	15
2004-03-31	15
2004-06-30	13
2004-09-30	17
2004-12-31	16
2005-03-31	15
2005-06-30	14
2005-09-30	16
2005-12-31	16
2006-03-31	15
2006-06-30	17
2006-09-30	16
2006-12-31	17
2007-03-31	18
2007-06-30	4
2007-09-30	4
2007-12-31	4
2008-03-31	8
2008-06-30	3
2008-09-30	7
2008-12-31	2
2009-03-31	5
2009-06-30	3
2009-09-30	6
2009-12-31	2
2010-03-31	5
2010-06-30	2
2010-09-30	2
2010-12-31	4
2011-03-31	5
2011-06-30	5
2011-09-30	5
2011-12-31	4
2012-03-31	4
2012-06-30	5
2012-09-30	8
2012-12-31	8
2013-03-31	44
2013-06-30	39
2013-09-30	22
2013-12-31	7
2014-03-31	9
2014-06-30	12
2014-09-30	10
2014-12-31	7
2015-03-31	7
2015-06-30	6