Quarter	US dollars
1999-03-31	33
1999-06-30	17
1999-09-30	24
1999-12-31	23
2000-03-31	23
2000-06-30	23
2000-09-30	23
2000-12-31	24
2001-03-31	24
2001-06-30	23
2001-09-30	24
2001-12-31	22
2002-03-31	15
2002-06-30	15
2002-09-30	15
2002-12-31	15
2003-03-31	15
2003-06-30	0
2003-09-30	1
2003-12-31	0
2004-03-31	0
2004-06-30	2
2004-09-30	35
2004-12-31	0
2005-03-31	0
2005-06-30	0
2005-09-30	0
2005-12-31	1
2006-03-31	1
2006-06-30	2
2006-09-30	28
2006-12-31	3
2007-03-31	2
2007-06-30	2
2007-09-30	3
2007-12-31	3
2008-03-31	3
2008-06-30	3
2008-09-30	3
2008-12-31	2
2009-03-31	3
2009-06-30	2
2009-09-30	3
2009-12-31	2
2010-03-31	2
2010-06-30	3
2010-09-30	2
2010-12-31	6
2011-03-31	3
2011-06-30	3
2011-09-30	11
2011-12-31	9
2012-03-31	8
2012-06-30	14
2012-09-30	11
2012-12-31	10
2013-03-31	10
2013-06-30	8
2013-09-30	7
2013-12-31	7
2014-03-31	7
2014-06-30	9
2014-09-30	11
2014-12-31	11
2015-03-31	13
2015-06-30	12